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[1]CHEN An,LI Jingji,LI Wenting,et al.Spatiotemporal of NDVI in the Yalong River Basin from 2001 to 2018 and Its Response to Climate Change[J].Research of Soil and Water Conservation,2022,29(01):169-175+183.

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Spatiotemporal of NDVI in the Yalong River Basin from 2001 to 2018 and Its Response to Climate Change

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 29 Number of periods: 2022 01 Page number: 169-175+183 Column: Public date: 2022-02-20

Title:: Spatiotemporal of NDVI in the Yalong River Basin from 2001 to 2018 and Its Response to Climate Change

Author(s):: CHEN An¹, LI Jingji^1,2, LI Wenting¹, LIU Yanguo³, WANG Na⁴; (1.College of Environment and Ecology, Chengdu University of Technology, Chengdu, Sichuan 610059, China; 2.State Key Laboratory of Geohazard Preventionand Geoenvironment Protection Chengdu Universityof Technology, Chengdu 610059, China; 3.Southwest University, Mianyang, Sichuan 621010, China; 4.College of Earth Science, Chengdu University of Technology, Chengdu 610059, China)

Keywords:: NDVI; partial correlation analysis; Yalong River Basin

CLC:: Q948.12

DOI:: -

Abstract:: In order to study the changes in vegetation cover in the Yalong River Basin and its influences on climate, based on the MOD13Q1 and meteorological data, the spatiotemporal distribution and changing trends of the NDVI in the Yalong River Basin in the growing season druing the period from 2001 to 2018 were analyzed by trend analysis and partial correlation analysis methods, and the response of NDVI variations to climate factors was also explored. The results indicated that:(1)from 2001 to 2018, the mean value of NDVI in the Yalong River Basin was 0.66, showing a trend of gradual decrease from southeastern to northwestern; In vertical distribution, the mean value of NDVI firstly increased and then decreased with the increasing of elevation;(2)in nearly 18 years, the NDVI increased at the rate of 0.003/decade in the Yalong River Basin; The area(63.97%)with increase of NDVI was greater than area(36.03%)with decrease of UDVI; from 2001 to 2018, the air temperature in the Yalong River Basin showed an upward trend and no significant trend of precipitation was observed; the climate of upper and middle streams presented the warmized and humidized developing orientation;(3)on the whole, NDVI was more affected by temperature than precipitation; temperature was positively correlated with NDVI, and precipitation was negatively correlated with NDVI. There were spatial differences in the response of NDVI to climate; the upper stream of the Yalong River Basin was affected by both temperature and precipitation, and most of the middle and lower stream was affected by precipitation. In general, vegetation growth in the Yalong River Basin was controlled by climate, topography and human activities, the improved areas of NDVI continued to increase in nearly 18 years.

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Last Update: 2022-02-20