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[1]Zheng Ruolin,Geng Guangpo,Deng Tiantian.Probability assessment of impacts of high-temperature and drought events on vegetation growth in Weihe River Basin[J].Research of Soil and Water Conservation,2025,32(06):258-269.[doi:10.13869/j.cnki.rswc.2025.06.027]

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Probability assessment of impacts of high-temperature and drought events on vegetation growth in Weihe River Basin

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 32 Number of periods: 2025 06 Page number: 258-269 Column: Public date: 2025-10-20

Title:: Probability assessment of impacts of high-temperature and drought events on vegetation growth in Weihe River Basin

Author(s):: Zheng Ruolin,Geng Guangpo,Deng Tiantian; (College of Geomatics,Xi'an University of Science and Technology,Xi'an 710054,China)

Keywords:: high temperature; drought; Weihe River Basin; vegetation; impact assessment

CLC:: P429； P954

DOI:: 10.13869/j.cnki.rswc.2025.06.027

Abstract:: [Objective] To reveal the spatiotemporal variation characteristics of high-temperature and drought events in the Weihe River Basin, quantitatively assess their impacts on vegetation growth, and provide a scientific basis for coping with climate change and effectively carrying out disaster prevention and mitigation efforts. [Methods] Using data from 1980 to 2020, including maximum temperature, precipitation, and NDVI (Normalized Difference Vegetation Index) in the Weihe River Basin, this study employed trend analysis, correlation analysis, and meta-Gaussian model to calculate the Standardized Temperature Index (STI) and Standardized Precipitation Index (SPI). The spatiotemporal distribution characteristics of high-temperature and drought events were analyzed, and the probabilities of vegetation activity decline under different high-temperature and drought conditions were quantified. [Results] Over the past 40 years, pronounced trends of high temperature and drought were observed, with notable temperature rise in the southeastern Guanzhong Plain and the northern Loess Plateau, while relatively severe droughts occurred in the west and north. Overall, high-temperature events were more frequent. The feedback effects of temperature on vegetation growth varied across different regions. In the central part of the river basin, rising temperatures contributed to vegetation growth, while negative feedback effects were observed in the southeast. Over 80% of the region showed positive correlations between vegetation and precipitation, and increased precipitation promoted vegetation growth. Irrigated areas were more sensitive to high temperature, while vegetation in rain-fed areas and grasslands was more influenced by precipitation variations. As high-temperature and drought conditions intensified, the probability of vegetation activity decline in the Weihe River Basin increased significantly. When high temperature(drought) conditions escalated from mild to moderate and severe levels, the probability of vegetation activity decline rose by 4%(8%) and 11%(16%), respectively. Compound high-temperature and drought conditions had the greatest impact on vegetation, and grasslands and rain-fed areas exhibited stronger sensitivity. This highlighted the combined effects of compound climate events, particularly evident in grassland ecosystems. [Conclusion] Over the past 40 years, hightemperature and drought conditions in the Weihe River Basin have intensified. As high-temperature and drought conditions strengthen in the river basin, the probability of vegetation activity decline significantly increases, particularly in the northern Loess Plateau region where compound high-temperature and drought events exert more severe impacts on vegetation than single climate events.

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Last Update: 2025-12-10