摘要
基于1998—2012年长时序SPOT 4-VGT归一化植被指数数据,在数据预处理的基础上,运用标准差和趋势分析法对珠江流域植被覆盖时空分布特征、波动特征和变化趋势进行了分析。结果表明:(1)1998—2012年,珠江流域月最大NDVI季节变化较明显,峰值出现在9月、极小值出现在2月,月均值为0.578,年最大NDVI均值整体呈上升趋势;在空间上,流域年最大NDVI均值为0.740,植被覆盖整体状况良好,但存在明显的空间分布差异。(2)1998—2012年,珠江流域NDVI的标准差存在明显的空间差异,年际波动较大的3个区域分别为珠江源喀斯特地区、流域中部广西盆地内的喀斯特地区和珠江三角洲地区。(3)近15年来,珠江流域年最大NDVI整体呈增长趋势,局部地区恶化。改善区域合计占总面积的57.29%,退化区域占总面积的9.20%,基本不变区域占总面积的33.51%。
The characteristics of spatial-temporal distribution,fluctuation and trends of vegetation cover change a-long Pearl River Basin during 1998-2012 are analyzed based on sequential SPOT 4-VGT data.Standard deviation and linear regression techniques are used after the data are preprocessed.Results show：（1）From 1998 to 2012, the seasonal maximum NDVI change along Pearl River Basin is obvious.The peak appears in September and mini-mum in February,the average is 0.578,the mean maximum NDVI is on the rise during recent 15 years.The aver-age of maximum NDVI is 0.740.The vegetation cover condition is good,but there is an obvious spatial differ-ences.（2）The standard deviation of NDVI exists obvious space difference in Pearl River Basin.The three areas of bigger inter-annual fluctuations are the karst plateau of Pearl River source,the central basin of Guangxi Zhuang Autonomous karst region and the Pearl River delta region respectively.（3）In recent 15 years,the mean maximum NDVI trend shows that vegetation is overall improved,deterioration of parts.Improved area,degradation area and constant area account for 57.29%,9.20%and 33.5 1%of the total area respectively.
出处
《桂林理工大学学报》
CAS
北大核心
2014年第4期711-716,共6页
Journal of Guilin University of Technology
基金
国家自然科学基金项目(41161073
41261088)
广西“八桂学者”岗位专项经费项目
广西空间信息与测绘重点实验室研究基金项目(桂科能1207115-04
1305114-11)
关键词
遥感
植被覆盖
趋势分析
珠江流域
SPOT 4-VGT
SPOT 4-VGT
remote sensins
vegetation coverage
remote sensing
trend analysis
Pearl River Basin
