湖南省植被覆盖度动态变化监测及影响因素分析

Monitoring and Influencing Factors Analysis for Vegetation Coverage Dynamic Change in Hunan Province

利用MODIS NDVI月平均数据及湖南省标准气象站的气象数据,采用像元二分模型对湖南省的植被覆盖度进行估算,并对其时空变化及影响因素进行分析。结果表明,湖南省植被每年3月进入生长季,9月结束。植被覆盖度总体呈上升趋势,上升趋势率为0.59%/a;湖南省89.16%的区域植被覆盖度呈上升趋势,仅1.29%的区域呈下降趋势。植被覆盖度减少最为严重的区域主要集中在长沙、岳阳等城市的周边地区;气温是影响植被覆盖度的主要气候因子。

Using the monthly average data of MODIS NDVI and the meteorological data of the standard meteorological station in Hunan Province:the vegetation fractional coverage(VFC)in Hunan Province was estimated by the pixel dichotomy model and its temporal and spatial changes and influencing factors were analyzed.The results showed that vegetation began growing in March,and ended in September.The VFC showed an upward trend with rising rate of 0.59%.The area with increasing trend of VFC accounted for 89.16%,while the area with reduction trend accounted for 1.29%.The areas with the most serious VFC reduction were mainly concentrated in the surrounding areas such as Changsha and Yueyang;temperature was the main climatic factor affecting the VFC.