富硒耕地质量综合评价及利用分区研究--以宜春市袁州区为例

Study on Comprehensive Evaluation and Zoning of Selenium-enriched Arable Land Quality:A Case Study of Yuanzhou District,Yichun

【目的】厘清袁州区可高效安全利用富硒耕地土壤资源范围,确定清洁富硒耕地的面积。从区域耕地立地条件、理化性质、土壤养分、土壤硒元素等方面,构建评价指标体系,开展富硒耕地质量综合评价,为袁州区富硒耕地高效、合理、可持续利用提供科学参考和技术支撑。【方法】运用ArcGIS软件,采用综合评价法,对袁州区富硒耕地质量进行评价;基于内梅罗综合污染指数法,探究研究区富硒土壤环境质量状况,结合富硒耕地质量综合评价及土壤环境质量进行富硒耕地利用分区研究。【结果】(1)袁州区富硒耕地质量总体较好,综合指数53.48~98.13,质量等级以二级耕地为主,面积23218.30 hm^(2),占耕地总面积的37.14%;从空间分布看,袁州区富硒耕地质量存在较强的空间分异性,富硒耕地质量北部高于南部,西部高于东部。(2)袁州区富硒耕地土壤重金属综合污染等级分清洁、尚清洁和轻度污染三级,富硒耕地土壤环境质量以尚清洁为主,占比60.87%,这表明研究区整体而言土壤环境质量较好。(3)将袁州区富硒耕地土壤划分为富硒耕地发展区、富硒耕地提升区和富硒耕地治理区,根据不同类型区域特点,提出相应的发展高效安全富硒农业的对策建议。【结论】袁州区富硒耕地土壤资源丰富,清洁富硒耕地面积占耕地总面积的58.86%,有较大的发展潜力。通过合理规划利用富硒耕地资源,可为区域科学发展特色富硒农业提供依据。

[Objective]This study aims to clarify the range of soil resources that can be used efficiently and safely in selenium rich farmland in Yuanzhou District,Yichun City of Jiangxi Province,as well as determine the area of clean selenium rich farmland.An evaluation index system,including regional cultivated land site conditions,physical and chemical properties,soil nutrients,soil selenium elements,established to conduct a comprehensive evaluation of the quality of selenium rich cultivated land,thus providing scientific reference and technical support for the efficient,rational and sustainable use of selenium rich cultivated land in the District.[Method]The quality of selenium rich cultivated land in Yuanzhou District was evaluated by using ArcGIS software and the comprehensive evaluation method;based on the Nemero comprehensive pollution index method,the environmental quality of selenium rich soil in the study area was explored,and the utilization zoning of selenium rich farmland was studied in combination with the comprehensive evaluation of the quality of selenium rich farmland and the soil environmental quality.[Results](1)The quality of selenium rich farmland in Yuanzhou District is generally good,with a comprehensive index of 53.48-98.13.The quality grade of the farmland is mainly secondary.The farmland covere an area of 23218.30 hm^(2),accounting for 37.14%of the total cultivated land area;From the perspective of spatial distribution,the quality of selenium rich farmland in Yuanzhou District has strong spatial differentiation.The quality of selenium rich farmland in the north is higher than that in the south,and that in the west is higher than that in the east.(2)The comprehensive pollution grade of heavy metals in the soil of selenium rich farmland in Yuanzhou District is divided into three grades:clean,moderately clean and slightly polluted.The soil environmental quality of selenium rich farmland is mainly moderately clean,accounting for 60.87%,which indicates that the soil environmental quality in the study area is good as a whole.(3)The soil of selenium rich cultivated land in Yuanzhou District is divided into developing area of selenium rich land,promoting area of selenium rich land and controlling area of selenium rich land.According to the characteristics of different types of regions,corresponding countermeasures and suggestions for the development of efficient and safe selenium rich agriculture are proposed.[Conclusion]Yuanzhou District is rich in selenium-rich farmland resources.The area of clean selenium rich farmland accounts for 58.86%of the total area of farmland,which has high potential for development.The rational planning and utilization of selenium rich cultivated land resources can scientifically develop selenium rich agriculture in regions.