Comprehensive assessment and evolution analysis of soil salinization in artificial oasis in arid desert area
LIU Zi-jin1,2,3, XU Cun-dong1,2,3, ZHU Xing-lin4, ZHOU Dong-meng4, TIAN Jun-jiao1,2, GU Feng-you1,2, HUANG Song1,2, LI Zhi-rui1,2, ZHAO Zhi-hong1,2, WANG Xin1,2
1. School of Water Conservancy, North China University of Water Resources and Electric Power, Zhengzhou 450046, China; 2. Key Laboratory for Technology in Rural Water Management of Zhejiang Province, Hangzhou 310018, China; 3. Henan Provincial Hydraulic Structure Safety Engineering Research Center, Zhengzhou 450046, China; 4. Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China
Abstract:To clarify the spatiotemporal variation characteristics of water and salt and the spatial evolution of salinization in artificial oasis in arid desert area, Jingtaichuan electric power irrigation area in Gansu Province was taken as the research area, 2002, 2010 and 2018 were selected as representative years. The soil salinization risk assessment system was constructed based on multi-level fuzzy theory from three driving processes: geological-climatic driven, soil-water environmental driven and natural-human driven. The cloud generator principle, golden ratio method, combined assignment method and queuing theory were integrated to construct a comprehensive spatial risk evaluation model of soil salinization. The long-sequence monitoring data, multi-temporal spatial data, and economic and social data were fused based on the element weights using ArcGIS10.2. The spatial risk state of salinization in each period was visually expressed and flow traced. The results of the study showed that: 1) The overall risks of land salinization in 2002, 2010 and 2018 were "critical", "critical-mild risk" and "mild risk"; 2) The dominant factors in the soil salinization were the depth of groundwater and the mineralization of groundwater; 3) In the irrigation area, the intensity of spatial evolution pattern of salinization risk: continuous change type>early change type>late change type>continuous stable type>repeated change type. The overall salinization risk in the study area showed a transition trend from "risk-free to critical state" and "from critical state to mild risk"; 4) From 2002 to 2018, the salinization in the study area was aggravating with obvious regional differences and generally presented an arcing increase from northwest to southeast.
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