Datasets from: Tropical forest aboveground productivity is maintained by nutrients cycled in litter

Datasets used in: Tropical forest aboveground productivity is maintained by nutrients cycled in litter Journal of Ecology (JEcol-2023-0461.R1)
Authors: Sayer, EJ, Leitman SF, Wright SJ, Rodtassana C, Vincent AG, Bréchet LM, Castro B, Lopez O, Tanner EVJ
File 1: GLMP_TreeData01-17_Sayer_et_al_JEcol2023.csv
Tree measurements for eight two-year census intervals from 2001 to 2017 in long-term litter manipulation plots in Panama, Central America.
COLUMNS & ABBREVIATIONS
OBJECTID -> unique consecutive number for each individual tree
treatm -> experimental treatment, where CT is control, LA is litter addition and LR is litter removal
block -> replicate block, given as letters A-E
plot -> plot number, given as numbers 1-15
species -> species code following mnemonics used in Condit et al. 2019
location -> location of an individual within a given plot, where TR indicates a location within 2-m of a trench (plot edge); MP indicates trees located within the inner 30-m x 30-m measurement plot and BZ indicates a location outside the measurement plot but more than 2-m from the nearest trench.
ACCaggr -> Mean score for measurement accuracy across all census intervals, where 1 is repeatable with high accuracy, 2 is repeatable with good accuracy and 3 is an inaccurate measurement due to obstructions
exclude -> Y = measurement was excluded from analysis
census -> measurement census interval, giving the first and last year of each interval between 2001 and 2017
year -> first year of each census interval
timestep -> time variable used for analysis, where the pretreatment census interval (2001-2003) is step 0, and subsequent census intervals after the start of measurement are numbered consecutively from 1-7.
wsg -> wood specific gravity measurements (grams per cm3 dry weight) from Condit et al. 2019
fun.gr -> functional group based on species’ recruitment responses to light according to Rüger et al. 2009, where ACC is accelerating species, DEC is decelerating species and NEG is negative species
light.ef -> light effect values (unitless) following Rüger et al. 2009
initial.dbh -> measured DBH at the start of each census interval
mm.yr -> absolute growth rate in mm per year
survival -> tree survival where 1 indicates that the tree survived a given census interval and 0 indicates that the tree dies during the census interval.

File 2: GLMP_Litterfall03-09_Sayer_et_al_JEcol2023.csv
Litterfall data for 2003 to 2019, collected monthly from litter traps (0.76 x 0.76 m) in long-term litter manipulation plots in Panama, Central America.
COLUMNS & ABBREVIATIONS
treatm -> experimental treatment, where CT is control, LA is litter addition and LR is litter removal
block -> replicate block, given as letters A-E
plot -> plot number, given as numbers 1-15
trap -> trap number (from 1-10) identifying individual traps within each plot
year -> year of collection
month -> month of litter collection
date -> date of sample collection - usually the last Thursday in each month
days.accum -> number of days between consecutive collections
mass.g.trap -> dry weight of the litter in grams per trap
time.step -> time variable used for analysis, where the first year of experimental treatments (2003) is step 0, and subsequent years after the start of treatments are numbered consecutively from 1-16.

References
Condit, R. et al. (2019). Complete data from the Barro Colorado 50-ha plot: 423617 trees, 35 years [Dataset]. Dryad. https://doi.org/10.15146/5xcp-0d46
Rüger, N., Huth, A., Hubbell, S. P., & Condit, R. (2009). Response of recruitment to light availability across a tropical lowland rain forest community. Journal of Ecology, 97, 1360-1368.