| Jiansanjiang Administration is an important base of grain reserve and commodity grain production in China.There are 15 large and medium-sized state-owned modern farms in Jiansanjiang Administration and paddy fields are the main planting types.In recent years,against the background of the project Consolidating and Improving Grain Production Total Amount to One Thousand Tons in Heilongjiang Province,Jiansanjiang Administration has undertaken a heavy task of commodity grain production.Because of the impact of high-intensity agricultural exploitation,the quantity and quality of water and land resources in this region have changed significantly.To pursue the goal of high yield,long-term,excess and unreasonable usage of chemical fertilizers and pesticides is applied to farmland,which seriously pollutes the water environment,resulting in serious agricultural non-point source pollution.For a long time,the finiteness and predatory exploitation and utilization of water-land resources have caused serious damage to the water-soil environment in Jiansanjiang Administration,and the contradiction between the exploitation of water-land resources and the quality of water-soil environment has become prominent increasingly.Under this background,the analysis of regional agricultural water-land resources matching pattern,the evaluation of regional water-soil environment quality,the construction of Development and Utility of Water Resources-Development and Utility of Land Resources-Water and Soil Environment(DUWR-DULR-WSE)system and coupling coordination analysis of each subsystem in DUWR-DULR-WSE system and the extraction of the driving factors of coordination of DUWR-DULR-WSE system all have important theoretical and practical significance for scientific understanding the interaction mechanism of various elements within the DUWR-DULR-WSE system,sustaining the sustainable development of agriculture and sustainable use of water-land resources and ensuring water security and grain security.Taking the 15 farms in Jiansanjiang Administration as examples,the matching characteristics of agricultural water-land resources is analyzed,the quality of surface water environment quality,groundwater quality and soil quality are evaluated,the coupling coordination characteristics and the driving mechanism of coordination of DUWR-DULR-WSE system are analyzed in this study.The main research content and conclusions are as follows:(1)The Gini coefficient model for agricultural water-land resources matching and the model for measuring the matching index between the broadly-defined agricultural water resources(BAWR)and land resources(MIBAWRLR)are constructed to evaluate the matching degree of agricultural water-land resources in Jiansanjiang Administration and 15 farms in the region during 2001-2016.The results shows that Jiansanjiang Administration is rich in cultivated land but lack of water resources relatively and the matching degree of agricultural land-water resources shows a trend of improvement year by year;the spatial distribution of land-water resources in each farm is uneven and the regional differences are significant,showing a rough matching pattern that the matching degree is good in southern region but bad in northern region.(2)The projection pursuit evaluation model of regional surface water environment based on Improved Chicken Swarm Optimization Algorithm,ELM evaluation model of regional groundwater quality based on the Crow Search Algorithm and fuzzy evaluation model of regional soil quality based on the Improved Entropy Weight Method are constructed to evaluate the water-soil environment quality of 15 farms in Jiansanjiang Administration taking 2016 as current year.The environment quality data are extended based on the multiple regression equations of the surface water environmental quality index,groundwater quality index,and soil quality index according to the 2016 data.The results shows that the water environmental quality in the Jiansanjiang Administration is poor in general and except for the Farm Qinglongshan,the Farm Qindeli and the Farm Daxing,the remaining farms do not meet the standard for a drinking water source;the groundwater quality of the farms is generally good,and the water quality grades concentrate in Grade II and Grade III;soil quality situation presents a spatial pattern of good in southwest and poor in the southeast and northwest;during 2001-2016,the surface water environment quality in Jiansanjiang Administration shows a trend of improvement with fluctuations year-by-year,groundwater quality shows a trend of deterioration with fluctuations year-by-year and the soil quality shows a trend of improvement with fluctuations year-by-year.(3)The features and coupling coordination relationship of DUWR-DULR-WSE system in Jiansanjiang Administration are analyzed based on coupling theory and synergy theory during 2001-2016.The results shows that the coupling degree of DUWR-DULR-WSE system in this region remained basically stable while coordination degree changes unsteadily;the coupling situation in each farm is good but the coordination degree are less than 0.8;the development and utility of water resources are lagging behind the development of water-soil environment in most farms,the development and utility are not balanced with the development and utility of land resources,and the existing development and utility mode of land resource are too dependent on water resources.(4)The principal component analysis method is used to analyze the driving mechanism of the coordination of DUWR-DULR-WSE system.The results are as follows: The key drivers of coordination of DUWR-DULR-WSE system are total water resources,annual water supply of water conservancy projects,number of electromechanical wells,proportion of effective irrigated area,population density and the amount of pesticides per unit area;the driving force index is increasing year by year.It shows that the driving force of coordination of DUWR-DULR-WSE system in Jiansanjiang Administration is stronger and stronger. |
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