The total number of LUQ's token data sets is: 151 (Added to 1 that has been deprecated and 2 non-LTER hosted data set for a total of 154)
The last Record Number Used for a Data Set is 195
The total number of Long-Term LTER data sets is 69 (Ongoing: 33, Completed: 36)
The total number of Short-Term LTER data sets is 83 (Completed: 83) Note: Long-Term data sets are defined as Duration of more than 5 years
Total of your current selection is: 43
|Numeric Data Set ID||Title (Data Set Identifier)||Abstract||Owner/Creator||Duration (Period of Time)||Status||Date Range|
|3||Luquillo Forest Dynamics Plot (LFDP) KML shapefile and coordinates||The LFDP shapefile (.kml) and coordinates||Mei Yu, Edwin Everham, Jess Zimmerman, Jill Thompson, Andrew McFadden||Long-Term||Completed||1990 to 2018|
|9||El Verde Field Station (EVFS) Area Boundary KML shapefile and coordinates||The EVFS Area Boundary shapefile (.kml) and coordinates||Mei Yu, Jess Zimmerman, Andrew McFadden||Long-Term||Completed||1937 to 2018|
|10||CTE Plots KML shapefile and coordinates||
The Canopy Trimming Experiment Plots KML shapefile and coordinates
|Mei Yu, Jess Zimmerman, Andrew McFadden||Long-Term||Completed||2011 to 2018|
|11||Elevation Plots KML Shapefile and Coordinates||
The Elevation KML shapefile and coordinates
|Mei Yu, Jess Zimmerman, Andrew McFadden||Long-Term||Completed||2012|
|15||Revegetation of landslides, vegetation <0.1m (Small landslide plots at the Luquillo Experimental Forest)||
The purpose of this study is to document the recovery of vegetation on new landslides in the Luquillo Experimental Forest, in particular seedlings <1m tall.
|Lawrence R. Walker||Long-Term||Completed||1988 to 2007|
|18||Revegetation of landslides, vegetation > 1.0m (Large landslide plots at the Luquillo Experimental Forest)||
Here we use permanent plot data sampled from 16 landslide to documents temporal successional pathways in landslide patches (without the use of a chronosequence, cf. Guariguata 1990) and address the following questions: (1) What are the successional pathways of landslide and what species define them? How much pathway variation of individual plots is there within these landslides? (2) How similar are pathways among landslide? Is there any evidence that, with time, landslides either converge to a common vegetative enpoint or slow in the rate of successional change?
The purpose of this study is to document the recovery of vegetation on new landslides in the Luquillo Experimental Forest.
|Lawrence R. Walker||Long-Term||Completed||1988 to 2007|
|29||Bisley daily rainfall (Bisley weekly environmental data)||
Data set includes all available daily, weekly, and monthly rainfall from several climate stations in the northeast section of the Luquillo Experimental Forest. These stations are surround the Bisley Experimental watersheds and the Sabana Field Station are are operated by the USFS and the USGS. Weekly canopy throughfall is also collected weekly from the Bisley experimental watersheds.
|Grizelle Gonzalez||Long-Term||Completed||1990 to 2011|
|31||Bisley 40 X 40 grid vegetation and site characteristics||
Relationships between landforms, soil nutrients, forest structure, and the relative importance of different disturbances were quantified in two subtropical wet steepland watersheds in Pueno Rico. Ridges had fewer landslides and treefall gaps, more above-ground biomass, older aged stands, and greater species richness than other landscape positions. Ridge soils had relatively low quantities of exchangeable bases but high soil organic matter, acidity and exchangeable iron. Valley sites had higher frequencies of disturbance, less biomass, younger aged stands, lower species richness and soils with more exchangeable bases. Soil N, P, and K were distributed relatively independently of geomorphic setting, but were significantly related to the composition and age of vegetation. On a watershed basis, hurricanes were the dominant natural disturbance in the turnover of individuals, biomass, and forest canopy. However. turnover by the mortality of individuals that die without creating canopy openings was faster than the turnover by any natural disturbance. Only in riparian areas was forest turnover by treefall gaps faster than turnover by hurricanes. The same downslope mass transfer that links soil forming processes across the landscape also influences the distribution of landslides, treefall gaps, and the structure and composition of the forest. One consequence of these interactions is that the greatest aboveground biomass occurs on ridges where the soil nutrient pools are the smallest. Geomorphic stability, edaphic conditions, and biotic adaptations apparently override the importance of spatial variations in soil nutrients in the accumulation of above-ground biomass at this site.
|Tamara Heartsill-Scalley||Long-Term||Completed||1988 to 2004|
|33||Meteorological data from towers (pre-Hugo) or rooftop (post Hugo) at El Verde||
The meteorological sensors were installed above the flat concrete roof of El Verde Field Station (elevation: 350 m asl). The building is in an approx. 0.3 ha clearing in a forest approx. 20 m tall. Data were processed and temporarily stored in a Campbell 21X data logger on-site. The station was initiated after the September 1989 hurricane. As this station was installed 3 meters above a concrete rooftop in a forest clearing, dry air temperatures during daylight hours are higher than those that would be measured in the adjacent forest. The USGS maintains a nearby (100 m away) station on a 20 m tower (since 1992). An additional station for temperature and humidity measurements in the forest understory was added in 1997. Additional measurements of daily rainfall and maximum and minimum air temperatures for this site since 1975 exist on separate files.
|Alonso Ramirez||Long-Term||Completed||1995 to 2000|
|36||Landslide Revegetation Canopy Measurements & Cover Estimates||
The purpose of this data set is to document recovery of vegetation in new landslides in the Luquillo Experimental Forest (LEF)
|Lawrence R. Walker||Long-Term||Completed||1988 to 2007|
|41||Habitat selection/Caracolus caracolla and other snails||
Various habitat characteristics are presented, as well as the apparency of common plant taxa at 7 heights (every 0.5 m from ground level to 3 m). The files are divided because variables measured varied by year. This data set consists of 7 files. Data sets from 1991 through 1995 each have slightly different categories for measures of litter depth, canopy openness, or physical features (e.g. slope, aspect, soil type) that are not always included in later data sets. In addition, plant species recorded changed slightly over this time period, but were standardized by 1996. Various habitat characteristics are presented, as well as the apparency of common plant taxa at 7 heights (every 0.5 m from ground level to 3 m).
|Michael R. Willig||Long-Term||Completed||1991 to 1995|
|42||Bisley Grid Habitat data 1994, 1999||
The data set consists of one file containing data from the summers of 1994 and 1999. Various habitat characteristics are presented, as well as the apparency of common plant taxa at 7 heights (every 0.5 m from ground level to 3 m). However, the data for some plant species were not divided by height in 1994; only total apparency of those species is available for that year.
|Michael R. Willig||Long-Term||Completed||1994 to 1999|
|43||Bisley Grid Invertebrate Data, 1989-1999||
The data set consists of counts of terrestrial invertebrates from the grid at Bisley Watersheds #1 and 2, for the years 1989, 1990, 1994, and 1999. Data for 1989 and 1990 are confined to 4 species of terrestrial snails: Caracolus caracolla, Gaeotis nigrolineata, Nenia tridens, and Polydontes acutangula. Counts for other snail species and the walking stick Lamponius portoricensis are available for 1994 and 1999.
|Michael R. Willig||Long-Term||Completed||1989 to 1999|
|44||Frog population plots (El Verde + Bisley)||
Long-term population patterns of coquies likely result from a variety of influences. Key among these are moisture, the physical habitat as affected by succession and disturbances of various scales, and predator population. Here, I present data on each of these factors along with a nine-year record of population numbers of coquies in four long-term study plots in the Luquillo Experimental Forest (LEF) of northeastern Puerto Rico.
|Lawrence L. Woolbright||Long-Term||Completed||1987 to 2017|
|45||Frog spatial distribution data (El Verde + Bisley)||
Most Puerto Rican Eleutherodactylus are terrestrial frogs that breed for prolonged periods of time in more or less continuous habitat. Because their life cycle lacks a free living larvae stage, reproductive behavior is not tied to bodies of water and they do not have the large aggregations typical of many aquatic breeders. For these reasons, assessing their population status requires examining fairly large areas of habitat. I began systematically sampling the anuran community on a 12 ha grid at the Bisley watersheds in 1989 and a second 16 ha grid at El Verde in 1993. These efforts have provided a comprehensive data set that can be used to evaluate future changes in the anuran community in this forest.
Count of frogs, various frog predators, and various frog preys were taken at regular intervals on the grids.
|Lawrence L. Woolbright||Long-Term||Completed||1988 to 1993|
|58||USGS Long-term daily streamflow data at several LEF locations||
The daily data are summarized to monthly as follows:
Table 1. United States Geological Survey (USGS) streamflow records from the Luquillo Experimental Forest. The periods of record presented here end with the 1994 water year (except for those stations whose records ended earlier). Watershed records are subdivided (a,b, etc.) when substantial gaps exist. The watersheds indicated with abbreviations are those where streamwater chemistry has also been measured. (NOTE: For recent data visit the USGS the Surface-Water Data for Puerto Rico web site at: http://waterdata.usgs.gov/pr/nwis/sw)
|Douglas A. Schaefer||Long-Term||Completed||1945 to 1994|
|62||Canopy height profile starting 1992, 1994 and 1996 of the Luquillo Forest Dynamics Plot (LFDP), Puerto Rico||
File LFDP_canopy contain the canopy heights for the Luquillo forest Dynamics plot. The first measurement started in 1992, and it was planned to measure the canopy height profile every 2 years. So far censuses starting in 1992, 1994, and 1996 have been completed. In the 1992 census the canopy height profile at points along the East and North limits of the plot were not included. In 1994 and 1996 these extra points were assessed. The National Science Foundation requires that data from projects it funds are posted on the web two years after any data set has been organized and "cleaned". The data from each census of the LFDP will be updated at intervals as each survey of the LFDP shows errors in the previous data collection. After posting on the web, researchers who are not part of the project are then welcome to use the data. Given the enormous amount of time, effort and resources required to manage the LFDP, obtain these data, and ensure data accuracy, LFDP Principal Investigators request that researchers intending to use this data comply with the requests below. Through complying with these requests we can ensure that the data are interpreted correctly, analyses are not repeated unnecessarily, beneficial collaboration between users is promoted and the Principle Investigators investment in this project is protected. Submit to the LFDP PIs a short (1 page) description of how you intend to use the data; Â· Invite LFDP PIs to be co-authors on any publication that uses the data in a substantial way (some PIs may decline and other LFDP scientists may need to be included); If the LFDP PIs are not co-authors, send the PIs a draft of any paper using LFDP data, so that the PIs may comment upon it; In the methods section of any publication using LFDP data, describe that data as coming from the "Luquillo Forest Dynamics Plot, part of the Luquillo Experimental Forest Long-Term Ecological Research Program"; Acknowledge in any publication using LFDP data the "The Luquillo Experimental Forest Long-Term Ecological Research Program, supported by the U.S. National Science Foundation, the University of Puerto Rico, and the International Institute of Tropical Forestry"; Â· Supply the LFDP PIs with 10 reprints of any publication using LFDP data. Â· Accept that the LFDP PIs can not guarantee that the LFDP data you intend to use, has not already been submitted for publication or published.
|Jess Zimmerman||Long-Term||Completed||1992 to 1997|
|70||USDC NOAA's National Climatic Data Center daily precipitation (5 stations)||
Daily precipitation at five stations in or near the LEF have been compiled by the National Climate Data Center. Here, WE present monthly sums of precipitation (P, in cm). Data are summarized through July 1992. Station details are as follows:
|Nicholas Brokaw||Long-Term||Completed||1931 to 1992|
|71||USDC NOAA's National Climatic Data Center monthly average of maximum temperature (2 stations)||
Maximum air temperature at two stations in or near the LEF have been compiled by the National Climate Data Center. Here we present monthly averages of the maximum air temperatures. Data are averaged per month through July 1992.
|Nicholas Brokaw||Long-Term||Completed||1931 to 1992|
|72||USDC NOAA's National Climatic Data Center monthly minimum temperature (2 stations)||
Daily precipitation, maximum, and minimum air temperature at five stations in or near the LEF have been compiled by the National Climate Data Center. Here I present monthly sums of precipitation (P, in cm) and monthly averages (T, in oF) of the maximum and minimum air temperatures. Data are summarized through July 1992 and additional data will be added when it becomes available.
|Douglas A. Schaefer||Long-Term||Completed||1931 to 1992|
|75||Fern sporophyte growth observation at the Luquillo Experimental Forest (LEF)||
Long-term (20-year) monitoring sites for monitoring ferns were established in the Luquillo Experimental Forest in 1991. Individuals of approximately 20 species of ferns were monitored on a regular basis from September 1991 through January 2010 to document annual and seasonal variation in plant and leaf traits, leaf and spore production rates, as well as and leaf damage levels. Effects of natural disturbanceincluding a drought in 1994 and Hurricane Georges in 1998 are reflected in these observations. The study includes sites in the El Verde, and Espiritu Santo and Bisley watersheds. The data set also includes observations from a comparative study of ferns in the mangrove community at the Jobos Bay National Estuarine Research Reserve that was begun in January 1998 and completed in January 2001.
|Joanne M. Sharpe||Long-Term||Completed||1991 to 2010|
|77||NADP/NTN precipitation chemistry data||
We report here the chemistry of weekly wet-only rainfall from the Luquillo Experimental Forest (LEF) NADP station (code PR20) for the period February 1985 through December 1996. Our station was knocked out by Hurricane Hugo in September 1989, and not reestablished until May 1991. The station remains in active service to the present and data from 1997 onwards is available directly from the NADP/NTN web site. //nadp.sws.uiuc.edu/nadpdata/state.asp?state=PR Samples are collected weekly on Tuesdays, field measurements of pH and conductivity are made, and the water sample is shipped to NADP for chemical analysis.
|Alonso Ramirez||Long-Term||Completed||1985 to 1994|
|86||Fungi of the Greater Antilles||
Over 20 researchers and cooperators were enlisted to produce a survey of the basidiomycetes of Puerto Rico, the Virgin Islands, Dominican Republic, and Jamaica. This included all basidiomycetes except rusts and smuts. These islands in the Greater Antilles were chosen for this survey for several reasons. There was previously very limited documentation on macrobasidiomycete diversity for these islands, although recent studies had shown that at least 15% of the species were undescribed. This project complemented previous and ongoing surveys in Mexico, Costa Rica, and Venezuela. The information gained from this project will ultimately help us to understand differences in colonization and rates of speciation among different groups of basidiomycetes in island chains. The investigators in this project discovered at least 75 new species and varieties so far, as well as several new genera (Pegler et al. 1998; Samuels & Lodge 1996) and one possible new family or order (see 'Aliens' under GENUS). Various cooperators have graciously provided identification of ascomycetes, myxomycetes, and mitosporic fungi, which are also included in the database.
|D. Jean Lodge||Long-Term||Completed||1983 to 2003|
|97||Sabana pasture permanent plot vegetation sampling||
Permanent plot data is expected to show these temporal patterns: (1) rapid increases in percent cover and tree stem density, and (2) rapid turnover from early to late successional plant species. Plant-plant competition should show quick increases in intensity with native grass species and exotic as top competitors. These may lead to exclusion of some trees common after landslide disturbance. Spatial patterns of invading trees should include edge effects due to dispersal limitation with clumping of bird-dispersed species before the first five years after cow exclusion. Because of intact soil and low vegetation in the pasture trees should grow, as measured by biomass(productivity), height, and basal diameter increases, significantly faster compared to colonization of landslides.
|Randall W. Myster||Long-Term||Completed||1995 to 2003|
|101||Ecuador old fields permanent plot vegetation sampling||
Permanent plot data is expected to show these temporal patterns: (1) rapid increases in percent cover and tree stem density, and (2) rapid turnover from early to late successional plant species. Plant-plant competition should show quick increases in intensity with native grass species and exotics as top competitors. These may lead to exclusion of some trees common after landslide disturbance. Spatial patterns of invading trees should include edge effects due to dispersal limitation with clumping of bird-dispersed species before the first five years after cow exclusion. Because of intact soil and low vegetation trees should grow, as measured by biomass(productivity), height, and basal diameter increases, significantly faster compared to colonization of landslides.
|Randall W. Myster||Long-Term||Completed||1998 to 2011|
|117||Bromeliad plant collection details/data from different elevations in the LEF||
Collection details of bromeliads collected for invertebrate community and diversity analysis from 4 localities in the LEF. Dates, location, plant size, amounts, pH and temp. of contained water, and weights of debris retained by the bromeliads.
|Barbara A. Richardson||Long-Term||Completed||1993 to 2010|
|131||Bromeliad invertebrate counts at different elevations in the LEF||
Identification and number of invertebrates recovered from each bromeliad sampled. Collection details of bromeliads collected for invertebrate community and diversity analysis from 3 localities in the Luquillo Experimental Forest. Dates, elevations and forest types, plant size, amounts, pH and temp. of contained water, weights of debris retained by the bromeliads, and counts of organisms, identified to species or morphospecies, collected from each plant.
|Barbara A. Richardson||Long-Term||Completed||1993 to 2010|
|134||Invertebrate dry weight data in various locations, mostly within the LEF at El Verde||Contains information [identity, counts, size, fresh and dry weights] of various collections of invertebrates (and the occasional amphibian or reptile), which has allowed formulae describing the relationship between length and dry wt. of invertebrates to be obtained. These have been used in estimating biomass in studies of bromeliad, heliconia and litter inveretebrates in the LEF. They will have a wider application.||Michael J. Richardson||Long-Term||Completed||1996 to 2006|
|138||Conservation and management of migratory fauna and dams in tropical streams of Puerto Rico||
1. Compared to most other tropical regions, Puerto Rico appears to have dammed its running waters decades earlier and to a greater degree. The island has more large dams per unit area than many countries in both tropical and temperate regions (e.g., 3x that of the U.S.), and the peak rate of large dam construction occurred two and three decades prior to reported peak rates in Latin America, Asia and Africa.
2. Puerto Rico is a potential window into the future of freshwater migratory fauna in tropical regions, given the island's extent and magnitude of dam development and the available scientific information on ecology and management of the island's migratory fauna.
3. We review ecology, management and conservation of migratory fauna in relation to dams in Puerto Rico. Our review includes a synthesis of recent and unpublished observations on upstream effects of large dams on migratory fauna and an analysis of patterns in free crest spillway discharge across Puerto Rican reservoirs. Analyses suggest that large dams with rare spillway discharge cause near, not complete, extirpation of upstream populations of migratory fauna. They also suggest several management and conservation issues in need of further research and consideration. These include research on the costs, benefits and effectiveness of simple fish/shrimp passage designs involving simulating spillway discharge and the appropriateness of establishing predatory fishes in reservoirs of historically fishless drainages.
|Effie A. Greathouse||Long-Term||Completed||1993 to 2003|
|148||Bisley rainfall and throughfall, and chemistry of rainfall and throughfall||
This data set contain summaries and analyses mean of collected weekly measurements expressed as mm per day, and calculation of fluxes, rates and means calculated after water chemistry analyses are conducted. Rainfall and throughfall are collected weekly at the Bisley LEF site. These data sets begin March 1988 and ends December 2003.
Rain and throughfall samples are the total catch for the week, and are exposed to field conditions for that time. No event sampling is conducted on a routine basis. Rainfall Collected in Bisley (RCB) are bulk or always-open collectors that receive dry deposition by sedimentation.
All samples are measured for pH and conductivity, and then filtered (pre-combusted Whatman GF/F glass fiber filter) prior to further analysis. From 1983-1994 samples were cooled and returned to the San Juan chemistry laboratory for analysis. During those years, samples for NH4 and NO3 analyses were refrigerated continuously until analysis. Sub samples for NH4 analysis were also preserved with 1 molar HCl. From 1994 on, samples for NH4 and NO3 were frozen until analysis, were not acidified, and all analyses were conducted at the University of New Hampshire.
Nutrient fluxes in rainfall and throughfall were measured weekly in a mature subtropical wet forest in NE Puerto Rico over a 15-year period that included the effects of five hurricanes and several prolonged droughts. Annual inputs of K, Ca, Mg, Cl, Na, and SO4-S are similar to those reported from other marine-influenced tropical forests. Rainfall input of nitrogen is comparatively low and reflects the relative isolation of the air shed. Mean annual rainfall and throughfall were 3482 and 2131 mm yr-1 respectively. On average, rainfall, throughfall, rainfall pH, and rainfall flux NH4-N and NO3-N had small but significant decreases throughout the study period. More nutrients fluxes had seasonal differences in rainfall (6 out of 12) than throughfall (4 out of 12). All volume weighted enrichment ratios calculated for the 15-year period were greater than one. However, median weekly enrichment ratios were less than 1 for sea salts and dissolved organic carbon and between 1 and 2 for Mg, Ca, SiO2 and SO4-S. In contrast, median weekly enrichment ratios were greater than 10 for NH4-N, PO4-P, and K and reflect biological enrichment within the canopy. Droughts reduced enrichment ratios of cations and sea-salts, but increased enrichment ratios for NH4-N, PO4-P and K. In the weeks following hurricanes relative throughfall tends to be higher and enrichment ratios tend to be lower. These long-term observations indicate that physical and biological processes associated with water passing through the canopy act to buffer internal nutrient cycles from inter-annual, and seasonal variations in rainfall inputs.
|Tamara Heartsill-Scalley||Long-Term||Completed||1988 to 2015|
|150||Pattern morphology for frogs captured at 9 locations in northeastern Puerto Rico over a 25-year period from 1978 to 2002||
We recorded the pattern morph for 9,950 frogs captured at 9 locations in northeastern Puerto Rico over a 25-year period from 1978 - 2002. Data revealed 21 distinct pattern morphs including a variety of stripes, bars, and spots. Analysis of morph frequencies between plots showed significant heterogeneity, with longitudinal stripes more common in grassland and disturbed areas, and spot and bar morphs more common in forests where palm and bromeliad axils are important habitat features. Comparison of morph frequencies through time at the same sites showed temporal shifts immediately following Hurricane Hugo in 1989. We suggest that the pattern polymorphism is maintained in part by local habitat matching resulting from selection pressure from visual predators.
|Lawrence L. Woolbright||Long-Term||Completed||1987 to 2002|
|156||Daily streamflow (Bisley area, 5 stations: Q1, Q2, Q3, Sabana, Puente Roto)||
The daily data are summarized to monthly as follows:
|Grizelle Gonzalez||Long-Term||Completed||1987 to 2010|
|158||Physical and chemical attributes of Quebrada Prieta, Bisley 3, Bisley 5, and Toronja related to shrimp populations measurements||Physical parameters, densities and sizes of two species of freshwater shrimps (Atya lanipes and Xiphocaris elongata) in four headwater streams (Quebrada Prieta, Toronja, Bisley 3 and Bisley 5) have been censused 2 times yearly since 1998 to determine the effects of predatory fishes on shrimp size and spatial distributions of pools relative to locations of waterfalls.||Todd Crowl||Long-Term||Completed||1988 to 2005|
|163||Patterns in litterfall production from 12 forested sites along an elevation gradient in Pico del Este||
We measured litterfall from 12 sites along an upper elevation gradient every two weeks from 1994 to present. Samples are being used to estimate the litterfall productivity over time and space, identify the impacts of periodic events, and help us understand the drivers of ecosystem and biogeochemical processes with climate and vegetation change.
|Whendee Silver||Long-Term||Completed||1994 to 2004|
|164||Canopy Trimming Experiment (CTE) trace gases||
This data set provides the monthly trace effluxes measured across the soil-atmosphere interface from five soil surface chambers in all the CTE plots.
|Whendee Silver||Long-Term||Completed||2004 to 2010|
|171||Terrestrial gastropods abundance data along an elevational gradient within the Sonadora River watershed||
The data set includes 5 files that contain abundance data for terrestrial gastropods along an elevational gradient within the Sonadora River watershed. Three files contain data from the same transect but differ in the year during which they were collected (2007, 2008, and 2017). The remaining 2 files contains data from a separate elevational transect (sites were located at the same elevation as in files 1 and 2) in palm dominated forest within the same watershed that was collected during the same time periods in 2008 and in 2017. Note: Plots at 250 m of elevation were not sampled in 2008 on either transect and a plot at elevation 750 m in the palm transect was never sampled.
|Michael R. Willig||Long-Term||Completed||2007 to 2017|
|173||Bird abundance-mist nets in the Luquillo Forest Dynamics Plot and Nora Devoe Cut Plots in the Luquillos Experimental Forest||
This project seeks to measure long-term trends and variability in bird populations in tabonuco forest at El Verde. Repeated measures of bird populations using mist nets are conducted annually in the Luquillo Forest Dynamics Plot. For each bird caught, I obtain physical measurements (weight, length of wing, length of tail), and estimates of fat, age, and breeding condition. Captured birds are marked to estimate mortality and longevity. Data on canopy openness are also collected annually at each mist net as part of this project.
|Robert B. Waide||Long-Term||Completed||1990 to 2005|
|178||Canopy Trimming Experiment Litterfall Nutrients Data||
Humid tropical forests have the highest rates of litterfall production globally, which fuels rapid nutrient recycling and high net ecosystem production. Severe storm events significantly alter patterns in litterfall mass and nutrient dynamics through a combination of canopy disturbance and litter deposition. In this study, we used a large-scale long-term manipulation experiment to explore the separate and combined effects of canopy trimming and litter deposition on litterfall rates and litter nutrient concentrations and content. The deposition of fine litter associated with the treatments was equivalent to more than two times the annual fine litterfall mass and nutrient content in control plots. Results showed that canopy trimming was the primary driver of changes in litterfall and associated nutrient cycling. Canopy trimming reduced litterfall mass by 14 Mg ha-1 over the 2.5 year post-trim period. Nutrient concentrations increased in some litter fractions following trimming, likely due to a combination of changes in the species and fractional composition of litterfall, and increased nutrient uptake from reduced competition for nutrients. Declines in litterfall mass, however, led to large reductions in litterfall nutrient content with a loss of 143 ± 22 kg N ha-1 and 7 ± 0.2 kg P ha-1 over the 2.5 year post-trim period. There were no significant effects of litter deposition on litterfall rates or nutrient content, contrary to results from some fertilizer experiments. Our results suggest that large pulsed inputs of nutrients associated with tropical storms are unlikely to increase litterfall production, and that canopy disturbance has large and lasting effects on carbon and nutrient cycling.
|Whendee Silver||Long-Term||Completed||2002 to 2007|
|181||Maximum temperature at El Verde Field Station, Rio Grande, Puerto Rico from January 1975 to August 1992||
Daily emperature has been measured at the El Verde Field Station since 1975 (see methods). Average record show that maximum values for maximum temperature recorded from May to October with a range from 29 to 30 and peaks of 29.7 Centigrade in October. The months of October through December show the most dramatic increase, specially December. Highest average maximum temperatures during these years were recorded in 1998 and 1999.
|Alonso Ramirez||Long-Term||Completed||1975 to 1992|
|186||Fern leaf traits observation at the Luquillo Experimental Forest (LEF)||
Ferns are a common element of the understory of forests, yet little is known about the dynamics of leaf production. The long-term role of an individual fern in the ecosystem understory is a function of the number and size of leaves produced over time and the quality of those leaves. Selected functional plant traits (see also LUQ186 -Fern nutrients) were measured in order to supplement non-destructive measurements and detect patterns of primary productivity of ferns in the long-term studies at the Luquillo forest where ferns have been included (eg. Fern growth and demography (LUQ75), Canopy Trimming Experiment (LUQ143 and LUQ146) and the Luquillo Forest Dynamics Plot). Among the important characteristics of fern leaves in the forest understory are the area and biomass of leaves needed to calculate specific leaf area (SLA), leaf dry-matter content (LDMC) and leaf shrinkage. Therefore a large sample of whole leaves and leaf material from several species in the Luquillo Experimental Forest understory was collected, weighed and leaf area measured. The means and regression relationships among these functional traits for species, leaf type and leaf size can then be used to estimate leaf production and turnover rates in temporal studies of fern growth.
|Joanne M. Sharpe||Long-Term||Completed||1996 to 2014|
|187||Fern leaf nutrients observation at the Luquillo Experimental Forest (LEF)||
Ferns are a common element of the understory of forests yet little is known about the dynamics of leaf production. The long-term role of an individual fern in the ecosystem understory is a function of the number and size of leaves produced over time and the quality of those leaves. Selected functional plant traits (see also LUQ186 -Fern nutrients) were measured in order to supplement non-destructive measurements and detect patterns of primary productivity of ferns in the long-term studies at the Luquillo forest where ferns have been included (eg. Fern growth and demography (LUQ75) Canopy Trimming Experiment (LUQ143 and LUQ146) and the Luquillo Forest Dynamics Plot). Among the important characteristics of fern leaves in the forest understory are the area and biomass of leaves needed to calculate specific leaf area (SLA) leaf dry-matter content (LDMC) and leaf shrinkage. Therefore a large sample of whole leaves and leaf material from several species in the Luquillo Experimental Forest understory was collected weighed and leaf area measured. The means and regression relationships among these functional traits for species leaf type and leaf size can then be used to estimate leaf production and turnover rates in temporal studies of fern growth.
|Joanne M. Sharpe||Long-Term||Completed||1999 to 2009|
|192||Luquillo Forest Dynamics Plot (LFDP) Liana Data||
Liana demographic data from the 16-Ha Big Grid (LFDP) over time: These data contain liana and tree data for two demographic censuses (summer 2001 and summer 2015) from 20 randomly selected quadrats within the LFDP (10 in the northern LFDP -cover classes 1-3 sensu Thompson et al. 2002) and 10 in the southern LFDP (cover class 4 sensu Thompson et al. 2002).
|Nicholas Brokaw||Long-Term||Completed||2011 to 2015|
|197||Canopy Trimming Experiment (CTE) Hourly Air Temperature data||Hourly air temperature measured by sensors in 3 points within each of the 12 CTE Plots from 2003 to 2009.||Alonso Ramirez||Long-Term||Completed||2003 to 2009|