基于MODIS影像的藏北高寒草甸的蒸散模拟

草业学报 ›› 2010, Vol. 19 ›› Issue (5): 103-112.

基于MODIS影像的藏北高寒草甸的蒸散模拟

付刚^1,2,沈振西^1*,张宪洲¹,武建双^1,2,石培礼¹

1.中国科学院地理科学与资源研究所生态系统网络观测与模拟重点实验室拉萨高原生态系统研究站,
北京100101;
2.中国科学院研究生院,北京 100049

收稿日期:2009-11-03 出版日期:2010-05-25 发布日期:2010-10-20
作者简介:付刚(1984-),男,河北保定人,在读博士。E-mail:fugang09@126.com
基金资助:
国家科技支撑计划项目(2006BAC01A04,2007BAC06B01)和国家自然基金项目(40771121)资助。

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

FU Gang^1,2, SHEN Zhen-xi¹, ZHANG Xian-zhou¹, WU Jian-shuang^1,2, SHI Pei-li¹

1.Lhasa Plateau Ecosystem Research Station, Key Laboratory of Ecosystem Network Observation and
Modeling, Institute of Geographic Sciences and Natural Resources Research, Beijing 100101, China;

2.Graduate University of Chinese Academy of Sciences, Beijing 100049, China

Received:2009-11-03 Online:2010-05-25 Published:2010-10-20

摘要/Abstract

摘要： 在高寒草甸生态系统中,蒸散(evapotranspiration,ET)是水循环中一个非常重要的组成部分。为了更好的模拟蒸散,本研究计算了生态系统尺度的水分利用效率(WUE_EC)。相关分析和多重逐步线性回归分析结果表明,影响WUE_EC的主要因子为归一化植被指数(NDVI)、空气相对湿度(Ha)和显热通量(H)。在此基础上,分别建立了WUE_EC与NDVI、Ha和H的线性回归方程(其中,H的模拟值WUE_H和WUE_EC差异显著),利用建立的WUE_EC的回归方程和植被光合模型(VPM)估计的总初级生产力(GPP_VPM)模拟了生态系统尺度的蒸散。模拟的蒸散(NDVI的模拟值ET_NDVI,Ha的模拟值ET_Ha)和通量观测的蒸散(ET_EC)的简单线性方程分别为ET_NDVI=1.2985ET_EC(R²=0.8029,n=46,P<0.0001)和ET_Ha=1.3118ET_EC(R²=0.7487,n=46,P<0.0001),这表明ET_NDVI和ET_Ha都能够比较准确地反应ET_EC,但仍然存在较大的差异,本研究采用多重逐步线性回归的方法定量分析了造成该差异的原因:ET_EC和ET_NDVI的差异(ET_EC－ET_NDVI)主要受光合有效辐射(PAR)和GPP_VPM的影响;而ET_EC和ET_Ha的差异(ET_EC－ET_Ha)主要受PAR、GPP_VPM和增强型植被指数(EVI)的影响。

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).

中图分类号:

付刚,沈振西,张宪洲,武建双,石培礼. 基于MODIS影像的藏北高寒草甸的蒸散模拟[J]. 草业学报, 2010, 19(5): 103-112.

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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