Contrasting vegetation changes in dry and humid regions ofthe Tibetan Plateau over recent decades

Contrasting vegetation changes in dry and humid regions ofthe Tibetan Plateau over recent decades

RuiQing Li[1,2];YanHong Gao[1];DeLiang Chen[3,4];YongXin Zhang[5];SuoSuo Li[1];;;

【期刊名称】《寒旱区科学：英文版》 【年(卷),期】2018(010)006

【摘要】An overall greening over the Tibetan Plateau(TP)in recent decades has been established through analyses of remotely sensed Normalized Difference Vegetation Index(NDVI),though the regional pattern of the changes and associated drivers remain to be explored.This study used a satellite Leaf Area Index(LAI)dataset(the GLASS LAI dataset)and examined vegetation changes in humid and arid regions of the TP during 1982–2012.Based on distributions of the major vegetation types,the TP was divided roughly into a humid southeastern region dominated by meadow and a dry northwestern region covered mainly by steppe.It was found that the dividing line between the two regions corresponded well with the lines of mean annual precipitation of 400 mm and the mean LAI of 0.3.LAI=0.3 was subsequently used as a threshold for investigating vegetation type changes at the interanual and decadal time scales:if LAI increased from less than 0.3 to greater than 0.3 from one time period to the next,it was regarded as a change from steppe to meadow,and vice versa.The analysis shows that changes in vegetation types occurred primarily around the dividing line of the

two regions,with clear growth(reduction)of the area covered by meadow(steppe),in consistency with the findings from using another independent

satellite

product.Surface

air

temperature

to

and

precipitation(diurnal temperature range)appeared contribute

positively(negatively)to this change though climate variables displayed varying correlation with LAI for different time periods and different regions.

【总页数】11页(P.482-492)

【关键词】Tibetan Plateau;vegetation change;leaf area index;climate change

【作者】RuiQing Li[1,2];YanHong Gao[1];DeLiang Chen[3,4];YongXin Zhang[5];SuoSuo Li[1];;;

【作者单位】[1]Key Laboratory of Land-surface Process and Climate Change in Cold and Arid Regions, Northwest Institute of Ecoenvironment and Resources, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China;[2]Inner Mongolia Autonomous Regional Meteorological

Observatory,

Hohhot,

Inner

Mongolia

010051,

China;[1]Key Laboratory of Land-surface Process and Climate Change in Cold and Arid Regions, Northwest Institute of Ecoenvironment and Resources, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China;[3]Regional Climate Group, Department of Earth Sciences, University of Gothenburg, Gothenburg, Sweden;[4]Institute of Tibetan

Plateau Research, Chinese Academy of Sciences, Beijing 100101, China;[5]National Center for Atmospheric Research, Boulder, Colorado, U.S.A.;[1]Key Laboratory of Land-surface Process and Climate Change in Cold and Arid Regions, Northwest Institute of Ecoenvironment and Resources, Chinese Academy of Sciences, Lanzhou, Gansu 730000, China;

【正文语种】英文 【中图分类】P 【文献来源】

https://www.zhangqiaokeyan.com/academic-journal-cn_cold-arid-region-science-english_thesis/0201271321734.html 【相关文献】

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