2001—2020年江西省农业干旱发生时空格局的遥感评价

The Remote Sensing Evaluation of the Spatio-Temporal Pattern of Agricultural Drought in Jiangxi Province From 2001 to 2020

基于MOD16A2蒸散数据产品,该文计算粮食作物生长季(4—10月)的作物水分胁迫指数(CWSI),分析江西省2001—2020年粮食作物生长季农业干旱发生时空分布特征.得到如下主要结论:1)利用CWSI遥感提取的农业受旱成灾耕地面积与统计结果具有高度一致性,这表明CWSI作为干旱评价指标具有一定的合理性;2)赣北鄱阳湖平原和赣中吉泰盆地等农业耕地集中连片分布区的受旱程度较高,而农业耕地相对破碎化的山地丘陵区农业受旱程度较低;3)在评估期内,2003、2004、2007、2008、2009、2013、2019和2020等年份农业干旱严重;4)受降水季节性分配不均的影响,江西省的农业干旱主要发生在4、5和10月份.

With the MOD16 A2 evapotranspiration products,the crop water stress index(CWSI) of the crop growing season(from April to October) is calculated,and the spatio-temporal pattern of the crop-growing-season agricultural drought from 2001 to 2020 are analyzed for Jiangxi Province.The following main conclusions are obtained.The droughted farmland area extracted by remote sensed CWSI is highly consistent with the statistical results,which shows that CWSI is reasonable as a drought evaluation index.The degree of drought is higher in the contiguous farmland area such as Poyang Lake Plain and Jitai Basin,while degree of drought is lower in fragmented agricultural farmland.Agricultural drought is severe in the years of 2003,2004,2007,2008,2009,2013,2019 and 2020 during 2001 to 2020.Affected by the uneven seasonal distribution of precipitation,agricultural drought is mainly happened in April,May and October in Jiangxi Province.