• 关键词：MODIS  地表温度植被覆盖度指数  生态用水  海河流域

• 基金项目：国家重点基础研究发展规划项目(G1999043605);国家自然科学基金重点项目(50239020);国家技术研究发展规划(863)项目(2003AA601010)

• 杨志峰
• 北京师范大学环境学院, 水环境模拟国家重点实验室, 北京 100875

• 姜杰
• 北京师范大学环境学院, 水环境模拟国家重点实验室, 北京 100875

• 张永强
• 中国科学院地理科学与资源研究所, 北京 100101

• 摘要：基于中分辨率成像光谱仪(MODIS)数据和地面气象数据,建立了区域植被生态用水模型.通过地表温度和植被覆盖度的“现状”三角关系,应用该模型计算了地表温度植被覆盖度指数(I_TVC),结合植被系数法计算了地表植被生态用水,并用该模型的计算结果分析了海河流域的生态用水.结果显示,基于“现状”三角法和植被系数法计算的植被现状环境用水与地表大型蒸渗仪实测结果较一致.海河流域植被生态用水具有明显的区域分布特征,西部山区和中东部黑龙港及运东平原和大清河淀东平原区植被生态用水量比较低,而在太行山山前平原、东南部平原以及北部燕山一带植被生态用水量比较高.

• Abstract：Now the research on ecological water usage and ecological water requirement is focused in the world. Based on middle-resolution MODISdata and surface meteorological data, a regional surface actual water consumption model was constructed. In the model, the “actual triangle” correlation between surface temperature (T_s) and fractional vegetation cover (f_c) was applied to calculate T_s-f_c index (I_TVC), and ecological water usage (E_a) was estimated by using the “actual triangle” method and plant coefficient method. The model was used in the Hai River Basin. The results showed that E_a with the model was accorded with the measurement of two large-scale lysimeters. Surface actual water consumption in the Hai River Basin appeared evident difference in local distribution. In the Taihang Mountain, the Heilonggang plain and the Eastern Daqinghe plain, the value of surface actual water consumption was low. Whereas its value was very high in the piedmont of Taihuang Montain, the southeast of the plain and the northern Yan Montain.

• Key words：remote sensing  surface temperature-vegetation cover index (ITVC)  ecological water Usage  the Hai River Basin

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