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[1]ZHANG Jin,WANG Bin,BAI Jianjun.Analysis of the Spatial and Temporal Characteristics of Drought in Gansu Province from 2000 to 2019 Based on the Vegetation State Index[J].Research of Soil and Water Conservation,2022,29(06):167-173,182.

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Analysis of the Spatial and Temporal Characteristics of Drought in Gansu Province from 2000 to 2019 Based on the Vegetation State Index

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 29 Number of periods: 2022 06 Page number: 167-173,182 Column: Public date: 2022-10-20

Title:: Analysis of the Spatial and Temporal Characteristics of Drought in Gansu Province from 2000 to 2019 Based on the Vegetation State Index

Author(s):: ZHANG Jin, WANG Bin, BAI Jianjun; (School of Geography and Tourism, Shaanxi Normal University, Xi'an 710119, China)

Keywords:: Gansu Province; drought change; Vegetation Condition Index(VCI); correlation analysis

CLC:: P338⁺.6

DOI:: -

Abstract:: Agricultural development is extremely sensitive to the impact of drought. In order to provide a scientific basis for formulating appropriate scientific response and drought mitigation measures, NDVI was used as the basic data, and the Vegetation Condition Index(VCI)was used as an indicator to characterise drought. By analysing the variation trend of VCI, calculating the drought frequency, the proportion of drought area, and analysing the correlation between VCI and precipitation, the temporal and spatial distribution characteristics of drought in Gansu Province at different spatial scales from 2000 to 2019 were discussed. Combined with land use types, the possibility of different degrees of drought in different land use types were analysed. The results show that: the agricultural drought in Gansu Province is most common in spring, followed by summer; spatially, it is dominated by global drought, that is, the proportion of drought area in Gansu Province was more than 50% during the study period, and the spatial pattern is high in the northwest and low in the southeast; The correlation coefficient between the vegetation state index and the monthly precipitation was the largest, reaching 0.827; the drought rate of forest land and grassland was the lowest, and the drought rate of unused land was the highest. To sum up, the drought in Gansu Province is dominated by global drought, and the spatial and temporal distribution is uneven.

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Last Update: 2022-10-20