1994—2008年河南省植被净第一性生产力及其时空变化

Vegetation net primary productivity and its temporal-spatial changes in Henan province during 1994—2008

基于地理信息系统和卫星遥感技术,利用地面气象数据、遥感数据和土地分类等数据,根据河南省实际植被覆盖和自然地理情况,应用改进的CASA模型估算了1994—2008年间河南省植被净第一性生产力及其时空变化。结果表明:河南省植被净第一性生产力与年均温度的相关性好于植被年净第一性生产力与年降水量和年均太阳辐射之间的相关性,温度是限制河南省植被净第一性生产力的主要因子;15年来河南省植被净第一性生产力呈增加趋势,但不明显;河南省主要植被类型的净第一性生产力从大到小依次为林地、灌丛、耕地、草地、其它植被,它们随时间的变化趋势极为一致。

Based on geographic information system and satellite remote sensing technique,the net primary productivity of vegetation and its temporal-spatial changes in Henan province during 1994—2008 were estimated by use of improved CASA model in this paper.The vegetation cover and situation of natural geography as well as the ground meteorological data,remote sensing data and land classification data were analyzed.The results showed that vegetation net primary productivity had a higher correlation with the annual average temperature than that with annual precipitation as well as annual solar radiation.The temperature was the primary limiting factor of vegetation net primary productivity in Henan province.The vegetation net primary productivity tends to increase during the last 15 years but its trend was not obvious.The order of the net primary productivity for different vegetation types in Henan province was as follows： woodland shrub cultivated land grassland other vegetation,which was consistent with time change.