黄河源植被时空变化及其对地形和气候的响应  

Spatiotemporal variations of vegetation and its response to topography and climate in the source region of the Yellow River

作　　者：覃巧婷 陈建军 杨艳萍 赵晓宇 周国清 尤号田[1,2] 韩小文 QIN Qiao-ting;CHEN Jian-jun;YANG Yan-ping;ZHAO Xiao-yu;ZHOU Guo-qing;YOU Hao-tian;HAN Xiao-wen(College of Geomatics and Geoinformation,Guilin University of Technology,Guilin 541004,China;Guangxi Key Laboratory of Spatial Information and Geomatics,Guilin University of Technology,Guilin 541004,China)

机构地区：[1]桂林理工大学测绘地理信息学院,广西桂林541004 [2]桂林理工大学广西空间信息与测绘重点实验室,广西桂林541004

出　　处：《中国环境科学》2021年第8期3832-3841,共10页China Environmental Science

基　　金：国家自然科学青年基金资助项目(41801030、41961065);广西自然科学青年基金资助项目(2018GXNSFBA281054);广西科技计划项目(桂科AD19245032);广西八桂学者专项项目;桂林理工大学科研启动基金资助项目(GUTQDJJ2017069)。

摘　　要：基于2000~2019年MODIS归一化植被指数(NDVI)遥感数据,辅以同期气温、降水和地形数据,通过最大值合成、趋势分析及相关分析法,分析了黄河源区植被的时空变化特征及其对地形和气候变化的响应.结果表明:黄河源区植被NDVI整体处于中高水平,但空间差异显著,呈现由东南向西北递减的空间分布格局;近20a来,植被总体上呈现出变好的趋势.植被对高程和坡度响应明显,随着高程的增加,植被NDVI呈现先增加后减少的趋势,但在3500~4100m区间植被NDVI变化不显著;此外,植被NDVI随着坡度的增大呈现出先增大后减小的变化趋势,且在24~26°坡度带植被NDVI达到最大值.黄河源区植被受气温和降水的共同影响,与降水相比,气温对黄河源区植被变化的影响更为显著.Based on MODIS normalized differential vegetation index(NDVI)remote sensing data from 2000 to 2019,combined with temperature,precipitation and topographic data during the same period,this paper analyzed the spatiotemporal variation characteristics of vegetation and its response to topographic and climate change by maximum value synthesis,trend analysis and correlation analysis in the source region of the Yellow River.The results showed that:The NDVI of vegetation in the source region of the Yellow River was at a medium to high level,but the spatial difference was significant,showing a decreasing spatial distribution pattern from southeast to northwest.In the past 20 years,the vegetation generally showed a trend of improvement.Vegetation had a significant response to elevation and slope.With the increase of elevation,the NDVI of vegetation first increased and then decreased,but there was no significant change in vegetation NDVI between 3500~4100 m.In addition,the NDVI of vegetation first increased and then decreased with the increase of slope,and reached the maximum in the slope zone of 24°~26°.The vegetation in the source region of the Yellow River was affected by both temperature and precipitation.Compared with precipitation,the influence of temperature on vegetation change was more significant.

关 键 词：植被变化 MODIS数据 空间分析 经典统计分析方法 黄河源区 

分 类 号：X826[环境科学与工程—环境工程]