基于MODIS产品的福建省植被NPP变化分析

Analysis of Vegetation Ecological Variation in Fujian Province Based on MODIS Data

植被净初级生产力(NPP)是反映植被生态的重要因子,利用NPP数据对区域生态状况进行研究具有重要的意义。基于MOD17A3遥感NPP数据产品,应用线性倾向值估计、标准方差等统计学方法和生态气象监测评价指数(EMI)模型,分析2000—2014年福建省植被生态状况及变化特征。结果表明,福建省NPP年平均值随年际变化,并呈略增加趋势,NPP年际总体波动幅度小,植被生产力较为稳定。

The Net Primary Productivity （NPP） is an important factor reflecting vegetation ecology. It is of great significance to study the ecological conditions of the region by using the NPP data. The ecological status and variation characteristics of vegetation in Fujian province from 2000 to 2014 were analyzed by means of statistical methods such as linear tendency value estimation, standard deviation, and ecological meteorological evaluation and monitoring index （EMI） model. The results showed that the annual average NPP value of the province slightly increased with the annual variation, with a small overall fluctuation range of NPP and relatively stable vegetation productivity. The distribution of NPP has obvious regional difference. Comparing with northern, northwestern and western regions in Fujian, the NPP value in southern part, coastal areas of middle east, and northeast was larger. The eastern region, more than half of Fujian, mainly showed a trend of growth of NPP, while the western region demonstrated a negative growth trend of it. In the province, EMI annual average value was slightly reduced with the interannual trend. Compared to the latter 8 years （2007—2014） and the former 7 years （2000—2006）, The variation of EMI is relatively stable overall. The vegetation ecological environment in the province is in the normal range, which is conducive to its maintenance of good ecosystem.