Gross primary productivity from leaf-age-dependent light use efficiency (LA-LUE) model over pantropical evergreen broadleaved forests

Tropical and subtropical evergreen broadleaved forests (TEFs) contribute more than one-third of terrestrial gross primary productivity (GPP). However, the continental-scale leaf phenology-photosynthesis nexus over TEFs is still poorly understood to date. This knowledge gap hinders most light use efficiency (LUE) models from accurately simulating the GPP seasonality in TEFs. Leaf age is the crucial plant trait to link the dynamics of leaf phenology with GPP seasonality. Thus, here we incorporated the seasonal leaf area index (LAI) of different leaf age cohorts into a widely-used LUE model (i.e., EC-LUE) and proposed a novel leaf-age-dependent LUE model (denoted as LA-LUE model). At the site level, the LA-LUE model (average R2 = 0.59, average RMSE = 1.23 gC m−2 d−1) performs better than the EC-LUE model in simulating the GPP seasonality across the nine TEFs sites (average R2 = 0.18; average RMSE = 1.87 gC m-2 d-1). At the continental scale, the monthly GPP estimates from the LA-LUE model ..., On the basis of the theory of light use efficiency, the LA-LUE model was proposed by incorporating the seasonal leaf area index (LAI) of different leaf age cohorts into the EC-LUE (Eddy Covariance – Light Use Efficiency) model. To do this, three LAI cohorts (i.e., LAIyoung, LAImature, and LAIold) were introduced to reconstruct the dynamic maximum light use efficiency (εmax) and absorbed photosynthetically active radiation (APAR) for young leaves, mature leaves, and old leaves. After that, the product of εmax and APAR of sunlit and shaded leaves were accumulated to each leaf age cohort, respectively, and then to simulate the total GPP. It utilizes a new leaf-age-dependent leaf area index (Lad-LAI) product in combination with ERA5 air temperature, dew temperature, and mean surface downward short-wave radiation flux data and NOAA Earth System Research Laboratories CO2 concentration product to produce a coherent seasonal data record of GPP over pantropical evergreen broadleaved forests. The..., , # Gross primary productivity from leaf-age-dependent light use efficiency (LA-LUE) model over pantropical evergreen broadleaved forests

[https://doi.org/10.5061/dryad.m0cfxppck](https://doi.org/10.5061/dryad.m0cfxppck)

## Description of the data and file structure

This dataset mainly contains monthly temporal resolution, 0.25° × 0.25° spatial resolution gross primary productivity (GPP) estimation from leaf-age-dependent light use efficiency model (LA-LUE) over pantropical evergreen broadleaved forests during 2001-2018. The mapped extent is longitude (-180, 180) and latitude (-30, 30). The MatLab code LALUE_Model.m and Parameters.txt contain the information to create the LA-LUE GPP dataset. 

## Sharing/Access information

The leaf-age-dependent leaf area index data are available from [https://doi.org/10.6084/m9.figshare.21700955.v4](https://doi.org/10.6084/m9.figshare.21700955.v4)

## **Code/Software**

The LA-LUE GPP dataset was obtained by MatLab R2023b and stored in .tif file form...