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[1]ZHANG Yan,WANG Laigang,LI Shimin,et al.Temporal and Spatial Analysis of Winter Wheat Drought on County Scale Based on Vegetation Condition Index[J].Research of Soil and Water Conservation,2023,30(04):423-430.[doi:10.13869/j.cnki.rswc.2023.04.038.]

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Temporal and Spatial Analysis of Winter Wheat Drought on County Scale Based on Vegetation Condition Index

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 30 Number of periods: 2023 04 Page number: 423-430 Column: Public date: 2023-06-10

Title:: Temporal and Spatial Analysis of Winter Wheat Drought on County Scale Based on Vegetation Condition Index

Author(s):: ZHANG Yan^1,2,3, WANG Laigang^1,2,3, LI Shimin^1,3, HE Jia^1,2,3, GUO Yan^1,2,3, YANG Xiuzhong^1,2,3, ZHANG Hongli^1,2,3, LIU Ting^1,2,3; (1.Institute of Agricultural Economic and Information, Henan Academy of Agricultural Sciences, Zhengzhou 450002, China; 2.Key Laboratory of Huang-Huai-Hai Smart Agricultural Technology, Ministry of Agriculture and Rural Affairs, Zhengzhou 450002, China; 3.Henan Province Engineering Research Center for Crop Planting Monitoring and Early Warning, Zhengzhou 450002, China)

Keywords:: winter wheat; drought; vegetation condition index; county scale

CLC:: S423; S512.1

DOI:: 10.13869/j.cnki.rswc.2023.04.038.

Abstract:: [Objective] By the spatial and temporal heterogeneity of winter wheat drought in the county was analyzed to provide auxiliary decision support for drought resistance and disaster reduction. [Methods] The vegetation condition index(VCI)was selected as the drought monitoring index. Based on GF1, Landsat, Sentinel-2 and other high resolution remote sensing data, the VCI of winter wheat in Yuzhou City from 2011 to 2021 was calculated. The variation coefficient, linear trend method, center of gravity migration and standard deviation ellipse were used to analyze the drought characteristics of winter wheat in Yuzhou City, such as stability, change trend, spatial and temporal changes. [Results](1)From the spatial point of view, the drought of winter wheat in Yuzhou City mainly distributed in the northern and western hillock areas from 2011 to 2021, and the drought area and drought intensity gradually expanded from plain area to hillock area.(2)The mean value of variation coefficient and variation percentage were 0.62 and 13.12%, respectively. The spatial distribution of drought stability and variation trend of winter wheat was highly consistent.(3)The total distance of the center of gravity migration trajectory and the standard deviation ellipse flat rate gradually decreased from no drought to severe drought, and the standard deviation ellipse area gradually increased, indicating that the spatial distribution of drought tended to scatter from concentration.(4)In terms of time, mild droughts occurred every year in period of winter wheat growth in Yuzhou City, with moderate and severe droughts occurring in an average of 2 to 4 years. Droughts were severe for three consecutive years in 2012—2014, with moderate and severe droughts accounting for more than 35 percent, followed by 2016 and 2018. [Conclusion] During the 11 years, the drought of winter wheat in Yuzhou City generally showed a good development trend, and the drought in the period of winter wheat growth in most regions was improved significantly, for severe drought and unstable areas, prevention and control should be strengthened.

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Last Update: 2023-06-10