Modeling the evapotranspiration of an alpine meadow ecosystem in the northern Tibet Plateau based on MODIS images

Abstract

Abstract: Evapotranspiration (ET) is an important component of the hydrologic budget in alpine meadow ecosystems of the Tibet Plateau. The water use efficiency (WUE_EC) at the ecosystem level was used to model ET. Simple linear correlation analysis and multiple stepwise linear regression analysis showed that normalized difference vegetation indices (NDVI), relative air humidity (Ha), and heat flux (H) could play important roles on the WUE_EC. We related WUE_EC with NDVI, Ha, and H, separately (there were significant discrepancies in water use efficiency modeled by H, WUE_H, and WUE_EC). We modeled evapotranspiration at the ecosystem scale with the multiple stepwise linear regression equations of water use efficiency (WUE) and estimated gross primary production (GPP_VPM) by a vegetation photosynthesis model (VPM). The simple linear regression equations between modeled evapotranspiration, ET_NDVI, ET_Ha, and observed evapotranspiration from eddy covariance of ET_EC, ET_NDVI=1.298 5ET_EC (R²=0.802 9, n=46, P<0.000 1) and ET_Ha=1.311 8ET_EC (R²=0.748 7, n=46, P<0.000 1), individually, showed some discrepancies in modeled evapotranspiration and ET_EC. We quantitatively analyzed these discrepancies. The differences between ET_EC and ET_NDVI were chiefly attributable to photosynthetic active radiation (PAR) and GPP_VPM, while the differences between ET_EC and ET_Ha were mainly attributed to PAR, GPP_VPM, and enhanced vegetation indices (EVI).

CLC Number:

FU Gang, SHEN Zhen-xi, ZHANG Xian-zhou, WU Jian-shuang, SHI Pei-li. Modeling the evapotranspiration of an alpine meadow ecosystem in the northern Tibet Plateau based on MODIS images[J]. Acta Prataculturae Sinica, 2010, 19(5): 103-112.

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