Study on Temporal Evolution and Spatial Reconstruction of Crop Virtual Water in Jilin Province

MA Xiaolei;School of Resources Environment and Tourism, Anyang Normal University;

crops virtual water;;standard deviational ellipse;;spatial distribution;;spatial reconstruction model;;counties of Jilin Province

Virtual water measures crop water consumption from the point of view of plant cumulative evapotranspiration, which is closer to actual water consumption of agriculture. In this paper, virtual water theory, ArcGIS standard deviational ellipse method and spatial reconstruction model were used to evaluate spatial distribution and its characteristics of crops virtual water in Jilin Province in 2000, 2005, 2010 and 2017. At last, the paper proposed three main models of agricultural virtual water spatial reconstruction from the perspective of spatial matching of agricultural water and soil resources. The results showed that:(1) the total amount of crop virtual water in Jilin Province had been on the rise since 2000, it increased from 14.746 billion m~3 in 2000 to 24.795 billion m~3 in 2017;(2) there were big regional differences of crop virtual water per unit area among eastern, central and western Jilin, crop virtual water per unit area showed gradually increasing trend from east to west;(3) the spatial gravity centers of both agricultural virtual water and crop sown area in Jilin Province were located in Changchun urban area, but the spatial gravity center of virtual water was located in the west of crop sowing area;(4) the virtual water quantity per unit area of main crops in Jilin Province decreased in the order: rice>sunflower>maize>tobacco>vegetable and soybean. In order to achieve the spatial matching of agricultural water and soil resources, it is necessary to optimize and adjust the cropping structure and layout of crops according to regional natural climate conditions, regional differences in crop water consumption and other factors.