生态学报2017，Vol.37Issue(9)：3149-3163,15.DOI:10.5846/stxb201601240164
1982-2012年中亚地区植被时空变化特征及其与气候变化的相关分析
Spatial-temporal variation of vegetation and its correlation with climate change in Central Asia during the period of 1982-2012
摘要
Abstract
Dry-land plant ecosystems are particularly sensitive to climate change.Despite their importance in the global carbon cycle,the responses of vegetation dynamics to climate change in recent decades in Central Asian dry-lands remain unclear.In this study,we used normalized difference vegetation index (NDVI) data to analyze spatial-temporal changes in vegetation and to determine the correlation between vegetation and climatic variables over the period of 1982-2012 in Central Asia using the empirical orthogonal function (EOF) and least square methods.The results showed that the annual NDVI in Central Asia experienced an overall weak increasing trend during the study period,and a sharp decrease since 1994,especially in the grasslands of northern Kazakhstan,which might have been caused by decreased precipitation during the last three decades.In terms of seasonal variation,the NDVI in spring had a greater increasing trend than did the other three seasons.A significantly declining trend (P＜ 0.05) was found in winter.Compared to a weak increase in the NDVI in the plains areas,the mountainous areas experienced the greater increasing trend and the trend was significant at the annual and seasonal scales (P ＜ 0.05).The EOF results illustrated that the annual NDVI showed a uniform spatial pattern during 1982-2012.Further,the NDVI showed long-range dependence characteristics,which indicated the increasing trend may be continuous in the future.In terms of the relationships between the NDVI and climate variables over Central Asia,the annual NDVI was positively correlated with annual precipitation,and a weak negative correlation between annual NDVI and temperature was detected.The positive correlation coefficient center appeared between the annual NDVI and annual temperature over the southern Central Asia,and the negative center appeared over the areas between Kazakhstan,Turkmenistan,and Uzbekistan.However,the opposite correlation coefficients were found over these areas between the annual NDVI and annual precipitation.In addition,one-month time lags were found between NDVI and temperature from June to September in Central Asia during 1982-2012.Our study provides important information on vegetation variation and would facilitate better understanding of the natural ecosystem changes over Central Asia for the past three decades.关键词
归一化植被指数(NDVI)/气候变化/降水/气温/植被动态变化/中亚Key words
NDVI/climate change/precipitation/temperature/vegetation dynamic changes/Central Asia引用本文复制引用
殷刚,孟现勇,王浩,胡增运,孙志群..1982-2012年中亚地区植被时空变化特征及其与气候变化的相关分析[J].生态学报,2017,37(9):3149-3163,15.基金项目
新疆大学博士毕业生科研启动基金资助项目(BS150247) （BS150247）
国家十二五科技支撑计划资助项目(2015BAB07BO3) （2015BAB07BO3）
国家自然科学基金项目(41461023,41561100) （41461023,41561100）
