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Assessment of five satellite-derived LAI datasets for GPP estimations through ecosystem models
Xie Xinyao1,2; Li Ainong1; Jin Huaan1; Tan Jianbo3; Wang Changbo1,2; Lei Guangbin1; Zhang Zhengjian1,2; Bian Jinhu1; Nan Xi1
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AbstractEcosystem models have been widely used for obtaining gross primary productivity (GPP) estimations at multiple scales. Leaf area index (LAI) is a critical variable in these models for describing the vegetation canopy structure and predicting vegetation-atmosphere interactions. However, the uncertainties in LAI datasets and the effects of their representation on simulated GPP remain unclear, especially over complex terrain. Here, five most popular datasets, namely the Long-term Global Mapping (GLOBMAP) LAI, Global LAnd Surface Satellite (GLASS) LAI, Geoland2 version 1 (GEOV1) LAI, Global Inventory Monitoring and Modeling System (GIMMS) LAl,and Moderate Resolution Imaging Spectroradiometer (MODIS) LAI, were selected to examine the influences of LAI representation on GPP estimations at 95 eddy covariance (EC) sites. The GPP estimations from the Boreal Ecosystem Productivity Simulator (BEPS) model and the Eddy Covariance Light Use Efficiency (EC-LUE) model were evaluated against EC GPP to assess the performances of LAI datasets. Results showed that MODIS LAI had stronger linear correlations with GLASS and GEOV1 than GIMMS and GLOMAP at the study sites. The GPP estimations from GLASS LAI had a better agreement with EC GPP than those from other four LAI datasets at forest sites, while the GPP estimations from GEOVI LAI matched best with EC GPP at grass sites. Additionally, the GPP estimations from GLASS and GEOVI LAI presented better performances than the other three LAI datasets at crop sites. Besides, the results also showed that complex terrain had larger discrepancies of LAI and GPP estimations, and flat terrain presented better performances of LAI datasets in GPP estimations. Moreover, the simulated GPP from BEPS was more sensitive to LAI than those from EC - LUE, suggesting that LAI datasets can also lead to different uncertainties in GPP estimations from different model structures. Our study highlights that the satellite-derived LAI datasets can cause uncertainties in GPP estimations through ecosystem models. (C) 2019 Published by Elsevier B.V.
KeywordSatellite-derived LAI datasets Gross primary productivity Topographic effects LUE model Process-based model
Indexed BySCI
WOS IDWOS:000482549900101
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Document Type期刊论文
Corresponding AuthorLi Ainong
Affiliation1.Research Center for Digital Mountain and Remote Sensing Application, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, China;
2.University of Chinese Academy of Sciences, Beijing 100049, China;
3.School of Traffic and Transportation Engineering, Changsha University of Science & Technology, Changsha 410114, China
First Author Affilication中国科学院水利部成都山地灾害与环境研究所
Corresponding Author Affilication中国科学院水利部成都山地灾害与环境研究所
Recommended Citation
GB/T 7714
Xie Xinyao,Li Ainong,Jin Huaan,et al. Assessment of five satellite-derived LAI datasets for GPP estimations through ecosystem models[J]. SCIENCE OF THE TOTAL ENVIRONMENT,2019,690:1120-1130.
APA Xie Xinyao.,Li Ainong.,Jin Huaan.,Tan Jianbo.,Wang Changbo.,...&Nan Xi.(2019).Assessment of five satellite-derived LAI datasets for GPP estimations through ecosystem models.SCIENCE OF THE TOTAL ENVIRONMENT,690,1120-1130.
MLA Xie Xinyao,et al."Assessment of five satellite-derived LAI datasets for GPP estimations through ecosystem models".SCIENCE OF THE TOTAL ENVIRONMENT 690(2019):1120-1130.
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