2000—2016年赤水河流域植被生态质量变化分析

Analysis of Eco-Environment quality variation of vegetation in Chishui river basin from 2000 to 2016

为研究中国西部赤水河流域植被生态质量变化特征,该文基于MODIS归一化植被指数(NDVI)和气象监测资料,获取了中国西部赤水河流域2000—2016年植被覆盖度、净初级生产力(NPP)以及植被生态质量指数变化数据,并对此17 a期间植被生态质量时空变化进行分析。结果表明:(1)植被覆盖度均值从2000年的55. 4%提高到了2016年的67. 4%,覆盖度呈平均每10 a增加6. 8%的变化趋势;(2)植被NPP均值从2000年的864 g C/m^2提高到了2016年的1 024 g C/m^2,NPP呈平均每10 a增加63 g C/m^2的变化趋势;(3)近年来植被生态质量显著提高,2016年植被生态质量为2000年以来最好,植被生态质量指数高达83. 7。

This paper aims to study the characteristics of the ecological quality variation of vegetation in Ch-ishui River Basin in western China. The vegetation coverage, net primary productivity （NPP） and vegetation eco-logical quality data were obtained based on MODIS Normalized Difference Vegetation Index （NDVI） and meteoro-logical monitoring data. The temporal and spatial characteristics of vegetation ecological quality in Chishui River Basin during the past 17 years were analyzed. The results show that： ①The mean vegetation coverage increases from 55.4% in 2000 to 67.4% in 2016, with an average increase of 6.8% in every 10 years. ②The mean NPP value of vegetation increases from 864 gC/m^2 in 2000 to 1024 gC/m^2 in 2016, with an average increase of 63 gC/mm^2 every 10 years. ③The vegetation ecological quality has greatly improved in recent years. Particularly the veg-etation ecological quality in 2016 is the best since 2000, and the vegetation ecological quality index reaches 83.7.