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[1]OUYANG Xijun,DONG Xiaohua,WEI Rong,et al.Analysis of Spatiotemporal Variation of NDVI in the Vegetation Growing Season and Responses to Climatic Factors in Qinghai-Tibet Plateau[J].Research of Soil and Water Conservation,2023,30(02):220-229.[doi:10.13869/j.cnki.rswc.2023.02.047]

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Analysis of Spatiotemporal Variation of NDVI in the Vegetation Growing Season and Responses to Climatic Factors in Qinghai-Tibet Plateau

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 30 Number of periods: 2023 02 Page number: 220-229 Column: Public date: 2023-03-10

Title:: Analysis of Spatiotemporal Variation of NDVI in the Vegetation Growing Season and Responses to Climatic Factors in Qinghai-Tibet Plateau

Author(s):: OUYANG Xijun^1,2,3, DONG Xiaohua^1,2,3, WEI Rong^1,2,3, GONG Chengqi^1,2,3, WU Hanyu^1,2,3; (1.College of Hydraulic and Environmental Engineering, China Three Gorges University, Yichang, Hubei 443002, China; 2.Engineering Research Center of Ecoenvironment in the Three Gorges Reservoir Region, Ministry of Education, Yichang, Hubei 443002, China; 3.Hubei Collaborative Innovation Center for Water Resources Security, Wuhan 430072, China)

Keywords:: NDVI; vegetation coverage; climate factor; time lag effect; Qinghai-Tibet Plateau

CLC:: Q948; X17

DOI:: 10.13869/j.cnki.rswc.2023.02.047

Abstract:: In order to explore the spatiotemporal evolution characteristics and driving factors of vegetation cover on the Qinghai-Qinghai Tibet Plateau Plateau and provide scientific basis for the ecological environment protection of the Qinghai-Tibet Plateau, based on the meteorological data of 139 meteorological stations in and around the Qinghai-Tibet Plateau from 1982 to 2015 and GIMMS NDVI data in the same period, the temporal and spatial variation characteristics of vegetation NDVI and its response to climate factors in the growing season of the Qinghai-Tibet Plateau were studied. The results show that:(1)during the study period, NDVI in the growing season of the Qinghai-Tibet Plateau generally showed an upward trend, and the change trend of NDVI in the growing season in different dry and wet areas was different; the proportion of vegetation degradation area in wet areas was relatively large, and the proportion of vegetation improvement area in arid areas was relatively large;(2)the vegetation in the study area will develop in the direction of improvement in the future; the vegetation area that will tend to improve in the future accounts for 62.25% and the area that will tend to degrade accounts for 37.58%;(3)there was a certain lag in the response of vegetation to various climate factors in the study area; grassland, meadow, alpine vegetation, and shrub mainly responded to temperature and relative humidity in the current month, precipitation in the current month or one month later, and sunshine hours in the current month or three months later;(4)the relative contribution rates of temperature, precipitation, relative humidity, and sunshine hours to vegetation NDVI changes on the Qinghai-Tibet Plateau were 37.19%, 27.53%, 20.30% and 14.97%, respectively; temperature and precipitation were the main climate driving factors for vegetation NDVI changes in humid/semi humid areas, semi humid areas, most semi-arid areas and arid areas, sunshine hours and relative humidity were the main climatic driving factors of vegetation NDVI change in humid areas and a few semi-arid areas; the main climatic driving factor of vegetation NDVI change in the whole growing season of the Qinghai-Tibet Plateau was temperature. To sum up, the vegetation on the Qinghai-Tibet Plateau showed an overall improvement trend, and temperature was the main climatic driving factor of vegetation change on the Qinghai-Tibet Plateau.

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Last Update: 2023-03-10