石河子绿洲植被净第一性生产力遥感估算研究

目的]探索适合西北绿洲区的NPP遥感模型,估算石河子绿洲区植被净第一性生产力.方法]在GIS的支持下,利用卫星遥感数据和气象数据,以光能利用率模型为基础进行研究.结果]构建了绿洲区植被净第一性生产力NPP估算模型,以1989～2001年的石河子绿洲区植被为例,对13年间的植被净初级生产力进行了估算,得到石河子绿洲区植被净第一性生产力13年平均值为2.086 TgC/a,其年均变化量为0.049 TgC/a,绿洲植被碳密度在237.3～309.3 gC/m2变化.结论]研究时段内NPP总体呈现增长的趋势,这主要是近年来该区降水、气温以及土地利用方式改变的影响结果.

Estimation of Vegetation Net Primary Productivity Based on Remote Sensing in Shihhotze Oasis

【Objective and Method】This paper made an estimation model of net primary productivity(NPP) based on geographic information system(GIS) and remote sensing(RS) technology by a case study in Shihezi oasis.【Result】The total annual NPP in Shihezi from 1989 to 2001 was attained from the NPP model.The results showed that the annual average NPP in Shihezi oasis was 2.086 TgC.The variation of annual average NPP was 0.049 TgC,the carbon density was changing between 237.3 gC and 309.3 gC per square meter.【Conclusion】The NPP generally showed a trend of increase during the research period and it was the result of the changes of precipitation,temperature and land use mode in recent years.