El Yunque Chronosequence Tree Census data

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The El Yunque Chronosequence plots consist of four sites, El Verde 1 (EV1), Sabana 1 (SB1), Sabana 2 (SB2), and Sabana 3 (SB3), which are located at the edges of El Yunque National Forest at sites to the south of El Verde and Sabana Field Stations.  The plots represent a range of successional stages representing areas in agriculture or recently abandoned in 1936 but reforested after 1950, and areas in agriculture or recently abandoned in 1977 and reforested since that time.  They range in size from ~0.5 to 1 ha, vary in elevation from ~150m to 550m a.s.l. and span a wide range of ages and land use histories (Table 1).

Plot Name





10,000 m2 (1 ha)

>62 yrs but < 76 yrs

~ 550m


4,625 m2 (~0.5 ha)

>62 yrs but not primary forest



6,400 m2 (~0.6 ha)

>35 yrs but < 62 yrs



4,800 m2 (~0.5 ha)

Primary forest


One of these plots (EV1) is south of El Verde Field Station, on Forest Service land just over the property boundary.  This area was in agriculture in 1936 but appeared forested in a 1950 aerial photograph, and there are differences in forest structure and species composition consistent with the known differences in land use history.  The other three Chronosequence sites are just south of the Sabana Field Station on Forest Service Land on the opposite side of the forest from El Verde.  One plot (SB2) is located in young secondary forest in an area immediately adjacent to an old teak plantation forest.  Another plot (SB1) is located in an area that was sparsely forested in 1936 and which appeared reforested in 1950.  The third plot in Sabana (SB3) is located in a patch of primary “tabonuco” (named for the abundance of this tree species) forest on a steep slope on the west side of the Sabana River.

Date Range: 
2011-06-24 00:00:00 to 2015-12-02 00:00:00

Publication Date: 

2016-10-13 00:00:00

Additional Project roles: 

Name: Maria Uriarte Role: Associated Researcher


All woody stems (excluding lianas) greater than 1cm diameter at 130cm above the ground were measured at the four site locations.  Physical damage, species, and tree location was also noted.

Additional information: 

STORAGE SITES (of data files): Field Data Forms: El Verde Field Station (University of Puerto Rico), El Yunque National Forest, Rio Grande, Puerto Rico   Electronic Data: El Verde Field Station (University of Puerto Rico), El Yunque National Forest, Rio Grande, Puerto Rico: LFDP office desktop, D:LFDP and Chronosequence Projects> Chronosequence> Master Datasets and Combined Data



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