基于MODIS/NDVI时序数列的广西九万山植被覆盖动态变化

利用2000—2014年九万山地区MODIS数据,采用均值变化法分析了九万山国家级自然保护区连续15年NDVI的动态变化.结果显示:九万山自然保护区植被总体长势较好,年均NDVI均在0.54以上;从时间角度看,NDVI呈现缓慢增加趋势,期间出现1个峰值和1个最低值;从空间角度来看,九万山南部NDVI最高,北部其次,中部最低,植被覆盖以中、高植被覆盖区为主,随时间变化,NDVI在空间上表现出波动变化;NDVI年代际变化率表明,九万山NDVI值在2000—2014年既有增加,也有减少.其中6年年代际变化率为负值,其余年份为正值,2009年达到变化率极值.

Dynamic Changes of Vegetation Cover Based on MODIS/NDVI in Jiuwan Mountain of Guangxi

Based on the continuous MODIS data from 2000 to 2014,the variations of NDVI in Jiuwan mountain were analyzed. The results showed that the plantations were growth well,the annual mean NDVI were all above 0. 54,the NDVI showed a slow increase trend which varied with years. From the time perspective,the vegetation cover show a slow upward trend,a peak value and a minimum value occurs during respectively 2008,2009; From space point of view,the south of this area vegetation coverage is highest,North Second,the central part is the lowest,the vegetation cover mainly was in medium and high; Vegetation cover variation rate show that NDVI from 2000 to 2014 for 15 consecutive years has decreasing but also increasing. Decadal variations was negative for six years,the rest of the year is positive,the rate of change in 2009 reached the extreme.