Leaf gas exchange and fitted parameters, San Lorenzo, Panama, 2020

Author(s): Lamour J; Davidson K; Ely K; Anderson J; Serbin S; Rogers A

Dataset Information


Site Name: Bosque Protector San Lorenzo (Fort Sherman)

Variables: Leaf gas exchange

Date Range: Jan. 14, 2020 - March 12, 2020

Description: This data package contains photosynthetic CO2 response curves (ACi curves), light response curves (AQ curves), dark adapted dark respiration, conductance curves, and survey measurements for leaves measured at the San Lorenzo forest canopy crane site, Panama (PA-SLZ) from January to March 2020. Leaves were sampled from both the top of the canopy and multiple heights within the canopy from 10 vertical profiles and included around 50 species. In addition, six core species were also measured, from the top of the canopy. Fitted maximum carboxylation rate (Vcmax), maximum electron transport rate (Jmax), and triose phosphate utilization rate (TPU) were derived from measured data as well as the convexity, light use efficiency, apparent quantum yield, and Rdark. The measurements can also be used to derive the conductance parameters g0 and g1 of stomatal model. All the gas exchange data and metadata are presented in .csv files and complete instrument output are included in .zip folders. Data and metadata meet the ESS-DIVE leaf-level gas exchange reporting format requirements. The protocol details are provided as pdf documents. In addition to gas exchange data described here these samples were also used for measurement of leaf optical properties, carbon and nitrogen content, and leaf mass per unit leaf area (LMA) these data can be cross linked using the unique sample ID and are provided in separate related data packages. Sample information including canopy elevation and leaf area index (LAI) can be found in the related “Leaf and canopy traits” data package.


Methods Description: We followed standard protocols to measure the Aci, AQ, dark respiration measurements, and conductance measurements on excised branches of multiple species from different positions inside the canopy. We also measured the leaf gas exchange on intact branches at the top canopy during survey measurements. A full description of methods are provided in the included protocol and metadata documents.

Access Level: Public

Originating Institution(s): Brookhaven National Laboratory

Sponsor Organization(s): U.S. Department of Energy Office of Science Office of Biological and Environmental Research

Contact: Rogers, Alistair - Brookhaven National Laboratory ([email protected])

Data Download

Version: 1.0

Dataset Citation: Lamour J; Davidson K; Ely K; Anderson J; Serbin S; Rogers A (2021): Leaf gas exchange and fitted parameters, San Lorenzo, Panama, 2020. 1.0. NGEE Tropics Data Collection. (dataset). http://dx.doi.org/10.15486/ngt/1781004

Acknowledgement: This research was supported as part of NGEE-Tropics, funded by the U.S. Department of Energy, Office of Science, Office of Biological and Environmental Research under contract no. DE-SC0012704.

Data Link: Download Dataset

NGEE Tropics data policy.


Lamour, J., Davidson, K.J. Ely, K.S., Li, Q., Serbin, S.P., Rogers, A. New calculations for photosynthesis measurement systems: what’s the impact for physiologists and modelers? New Phytologist (2021) https://doi.org/10.1111/nph.17762