基于NDVI云南地区植被生态系统对气候变化的适应性分析

Adaptability of vegetation ecosystem to climate change based on the NDVI in Yunnan province, China

基于遥感影像数据资料和ArcGIS,利用2000—2016年云南地区植被生态系统NDVI与气温及降水之间的响应关系,分析不同区域气候变化类型对当地植被生态系统长势的潜在影响,进行气候变化背景下植被生态系统的适应性分析。结果表明:研究区2000—2016年NDVI整体呈现不同程度的增加趋势,植被覆盖度显著增加的区域主要分布在滇东北和东部的部分地区,植被覆盖度减小的区域主要集中在中部城市密集地区和滇西北。NDVI和气温整体上呈正相关关系,尤其以东北和东部地区较为明显,负相关的区域主要分布于滇西北高海拔地区;NDVI和降水的相关性小于气温。基于NDVI的植被生态系统表现为适应和中度适应当地气候变化类型的区域占研究区总面积89.16%,主要分布于南部、东北部和东部地区;表现为不适应当地气候变化类型的区域主要分布于中部城市密集地区、滇西北部分地区。森林生态系统表现为适应和中度适应当地气候变化类型的区域占研究区总面积的79.29%,主要分布于东部、东北部和南部部分区域,不适应当地气候变化的区域主要分布在滇西北和中部零星地区。

Normalized difference vegetation index(NDVI)is an important remote sensing parameter,and it can accurately reflect the growth status of vegetation,biological,physical,and chemical properties,and the changes in ecological system.Using the relationship between NDVI and the temperature,precipitation from 2000 to 2016,the potential effects for different types of regional climate change on the local vegetation growth in Yunnan province were analyzed,and the adaptability of vegetation ecosystem to climate change was quantitatively identified.The results showed that the NDVI had an increasing trend from 2000 to 2016 in the study area.The area of increased vegetation coverage was mainly distributed in the northeast and east parts of Yunnan,and the decreased vegetation area was mainly concentrated in northwest part and central urban region.There was a positive correlation between NDVI and temperature in the study area as a whole,especially in the northeast and east regions,and the area with negative correlation was mainly distributed in the high altitude area of northwest Yunnan.The correlation between NDVI and precipitation was smaller than that of temperature.The vegetation ecosystem in the study area was 89.16%of the total area,which was characterized by adaptation and moderate adaptation to local climatic change,and they were mainly distributed in the south,northeast and eastern parts of Yunnan.The vegetation ecosystems showing the inadaptability to local climatic change were mainly distributed in central urban regions and parts of northwest Yunnan.The forest ecosystem in the study area was 79.29%of the total area,which was characterized by adaptation and moderate adaptation to local climate change,and they were mainly distributed in the east,northeast and parts of the south regions.