Response of Vegetation Cover Change to Drought at Different Time-scales in the Beijing-Tianjin Sandstorm Source Region,China  

作　　者：CAO Bo KONG Xiaole WANG Yixuan LIU Hang PEI Hongwei SHEN Yan-Jun 

机构地区：[1]Key Laboratory of Agricultural Water Resources,Hebei Laboratory of Agricultural Water-Saving,The Innovative Academy of Seed Design(INASEED),Center for Agricultural Resources Research,Institute of Genetics and Developmental Biology,Chinese Academy of Sciences,Shijiazhuang 050022,China [2]University of Chinese Academy of Sciences,Beijing 100049,China [3]Hebei University of Architecture,Zhangjiakou 075000,China

出　　处：《Chinese Geographical Science》2021年第3期491-505,共15页中国地理科学（英文版）

基　　金：Under the auspices of National Natural Science Foundation of China(No.41807177,41701017);the Pioneer‘Hundred Talents Program’of Chinese Academy of Sciences。

摘　　要：Dominated by an arid and semiarid continental climate,the Beijing-Tianjin Sandstorm Source Region(BTSSR)is a typical ecologically fragile region with frequently occurring droughts.To provide information for regional vegetation protection and drought prevention,we assessed the relations between vegetation cover change(measured by the Normalized Difference Vegetation Index,NDVI)and the Standardized Precipitation Evapotranspiration Index(SPEI)at different time-scales,in different growth stages,in different subregions and for different vegetation types based on the Pearson's correlation coefficient in the BTSSR from 2000 to 2017.Results showed that 88.19%of the vegetated areas experienced increased NDVI in the growing season;48.3%of the vegetated areas experi-enced significantly increased NDVI(P<0.05)and were mainly in the south of the BTSSR.During the growing season,a wetter climate contributed to the increased vegetation cover from 2000 to 2017,and NDVI anomalies were closely related to SPEI.The maximum correlation coefficient in the growing season(Rmax)was significantly positive(P<0.05)in 97.84%of the total vegetated areas.In the vegetated areas with significantly positive Rmax,pixels with short time-scales(1-3 mon)accounted for the largest proportion(33.9%).The sensitivity of vegetation to the impact of drought rose first and then decreased in the growing season,with a peak in July.Compared with two subregions in the south,subregions in the north of the BTSSR were more sensitive to the impacts of drought variations,especially in the Xilingol Plateau and Wuzhumuqin Basin.All four major vegetation types were sensitive to the effects of drought variations,especially grasslands.The time-scales of the most impacting droughts varied with growth stages,regions,and vegetation types.These results can help us understand the relations between vegetation and droughts,which are important for ecological restoration and drought prevention.

关 键 词：vegetation cover change standardized precipitation evapotranspiration index(SPEI) ecological restoration drought prevention Beijing-Tianjin Sandstorm Source Region(BTSSR)Citation:CAO Bo KONG Xiaole WANG Yixuan LIU Hang 

分 类 号：X171.4[环境科学与工程—环境科学] P426.616[天文地球—大气科学及气象学]