摘要
在光能利用率模型的基础上,考虑了温度和地面水气压差的影响,建立了基于MODIS数据的草地净初级生产力遥感估算模型。利用2003年生长季(4～11月)1km分辨率的MODIS数据和黄土高原73个站点的累年各月平均太阳总辐射值数据以及其它相关数据,估算了2003年黄土高原地区草地净初级生产力。结果表明:2003年黄土高原地区草地的净初级生产力最高值达516gc/(m2.a),最低值为1gc/(m2.a)。黄土高原NPP空间分布格局是西部和南部两区域高,然后以东南西北方向为轴心逐渐向内陆中心部分递减,这与区域的水热条件差异和草地地带性分异规律紧密相关。
Based on light-use efficiency model, a net primary productivity model for grassland using EOS/ MODIS data was proposed. This model considered the influences of temperature and the difference of surface water vapor pressure. The NPP of grassland in 200a was calculated using MODIS data with 1km×1km resolution from April to November in 2003, the multi-year annual average value of monthly solar radiation of 73 meteorological stations in the Loess Plateau and other relevant datasets. The result showed that the estimation of maximum net primary productivity of the entire Loess Plateau is 516 gC yr -1 while the minimum is 1 gC yr-1. The spatial pattern of NPP in Loess Plateau indicated that high values of NPP distributed in the south and west corners, then rapidly decreased from the southeast and northwest corners into the center inland regions. The trend is closely related with the differences of hydro-thermal conditions and the law of zonal differentiation of grassland.
出处
《遥感技术与应用》
CSCD
北大核心
2009年第5期660-664,I0005,共6页
Remote Sensing Technology and Application
基金
甘肃省自然科学基金项目(0803RJZA088)
