摘要
内蒙古半干旱地区存在着严重的缺水问题,而在草原生态系统中,植被蒸发蒸腾是水分损失的一个重要途径。以不同退化程度的草地为主要研究对象,围绕着区域缺水问题,首先运用MODIS卫星遥感数据定量反演了地表参数(组分温度、反照率、叶面积指数、植被覆盖度等);然后从地表能量平衡原理入手,结合地面同步实测数据和气象数据,运用遥感蒸散法,建立了基于亚像元的半干旱地区区域双层蒸散模型。为提高区域缺水遥感定量研究的精度提供了保障,也对西部半干旱地区的生态环境保护具有现实意义。
Heavy deficit of water is a key problem in semi-arid area of the northwest China,Inner Mongolia. Evapotranspiration is the main reason causing the loss of water in grassland ecosystem. We selected different degraded grasslands as study objects. First,land surface parameters are inversed quantitatively using remote sensing in this paper,such as albedo,vegetation/soil component temperatures,vegetation coverage,leaf area index,and so on. Then according to surface energy balance theory,the semi-arid regional dual-layer evapotranspiration model is established in sub-pixel scale using remote sensing,combined with the ground measurement and meteorological data. This study can assure the improvement of the regional water deficit quantitative research precision using remote sensing. It has practical significance in environment protection of the western semi-arid area.
出处
《干旱区资源与环境》
CSSCI
CSCD
北大核心
2010年第9期64-67,共4页
Journal of Arid Land Resources and Environment
基金
国家自然科学基金项目(批准号:40501051)
国家重点基础研究发展规划项目(G2000077907)资助
关键词
组分温度
叶面积指数
亚像元
双层蒸散模型
component temperatures
leaf area index
sub-pixel scale
dual-layer evapotranspiration model
