摘要
以内蒙古河套灌区为研究对象,利用灌区2006—2010年的水均衡资料和MODIS数据,以区域水量平衡法得到的灌区作物腾发量ET为控制总量,建立了灌区年均作物系数(Kc)与年均归一化植被指数(NDVI)的统计关系,并以基于NDVI的Kc作为分配因子,结合FAO 56推荐的Penman-Monteith方法得到了作物腾发量的空间分布。结果表明,1利用NDVI估算Kc是可行的,河套灌区年均作物系数Kc与年均NDVI间的关系可以表示为Kc=1.477 NDVI+0.166;2将基于NDVI的Kc作为分配因子可以较好地实现大区域尺度上作物腾发量的空间分布。
In this paper,the relationship between average annual crop coefficient（Kc）and average annual normalized difference vegetation index（NDVI）was established based on the MODIS data and the total quantity of the crop evapotranspiration derived by the water balance method of the Hetao irrigation district from 2006 to 2010.Then the spatial distribution of the crop evapotranspiration was obtained fromKcbased on NDVI as distribution factor and the reference crop evapotranspiration（ET0）based on FAO56 PenmanMonteith method.The results showed that1 it was feasible to estimate regional crop coefficient based on NDVI,and the relationship between average annual Kcand average annual NDVIin Hetao irrigation district was Kc=1.477 NDVI＋0.166;2Taking the Kcbased on NDVI as distribution factor,the spatial distribution of large-scale regional crop evapotranspiration could be achieved.
出处
《灌溉排水学报》
CSCD
北大核心
2016年第4期20-25,共6页
Journal of Irrigation and Drainage
基金
内蒙古自治区水利科技重点项目([2014]117-2)
