华北植被的光能利用率及其时空变化分析

Light Utility Efficiency and Its Spatial-Temporal Changes in North China

利用华北地区2007年的NOAA18 1B卫星资料和402个气象站点的观测数据,建立了利用NOAA18 1B卫星资料和气象资料估算光能利用率(Light Utility Efficiency,LUE)的新技术方法,并研究了华北地区植被LUE及其时空变化。结果表明:利用NOAA18 1B卫星资料来估算华北地区植被LUE,效果较好。华北地区植被的年LUE介于0%～1.13%之间,最大LUE为2.83%。北京、河北、天津、山西及内蒙古各省(区)平均LUE依次为0.57%,0.52%,0.47%,0.39%和0.26%。各种植被类型LUE为森林与灌丛为0.35%～0.74%,草原为0.11%～0.35%,农田为0.44%～0.51%,建筑用地为0.30%,荒漠裸地仅为0.02%。华北各省(区)夏季平均LUE为0.52%～1.14%;秋季和春季平均LUE分别为0.16%～0.49%和0.08%～0.31%;冬季的大部分时间LUE极低,接近零。

Light utility efficiency（LUE） of vegetation in North China in 2007 was estimated using NOAA18 1B satellite data and weather data.And a kind of method was set up to estimate LUE using the NOAA18 1B satellite data.The simulated LUE in North China are consistent with the LUE in the same region in other researches.The method to estimate LUE is reliable.The annual average LUE of 2007 in North China vary between 0%～1.13%,and the maximum LUE is 2.83%.The spatial average LUE are separately 0.57%,0.52%,0.47%,0.39% and 0.26% for the Beijing region,Hebei province,Tianjin,Shanxi and Inner Mongolia.The LUE of forest,shrubland and bushland are 0.35%～74%,0.11%～0.35% in grassland,0.44%～0.51% in crop,0.30% in urban and built-up,and 0.02% in bare land and sandy desert.LUE value in summer is largest in four seasons,and seasonly average LUE in summer in different provinces（areas） is 0.52%～1.14%.And seasonly average LUE in autumn and spring is 0.16%～0.49% and 0.08%～0.31%,separately.LUE value in winter is fairly low and close to zero.