| With the development of the times and the progress of society,people’s awareness of health care is getting stronger and stronger,and they are paying more and more attention to health problems.Selenium is one of the essential trace elements for humans and animals.Study the utilization of selenium-enriched soil resources,develop selenium-enriched agricultural industry according to local conditions,meet the requirements of national safe diet and healthy life,and also meet the needs of national and social development,and conform to the current implementation of the agricultural supply-side structural reform policy.Carrying out the evaluation of the suitability of the development and utilization of selenium-enriched soil resources,and carrying out comprehensive utilization zoning on this basis,can provide scientific guidance for the rational planning,development and utilization of selenium-enriched soil resources,and provide guidance for the planning of selenium-enriched land resources and selenium-enriched industries.Important reference and reference are of great significance to realize the effective,safe and efficient utilization of selenium-rich soil resource endowment.In this paper,the agricultural land in Yuanzhou District,Yichun City,Jiangxi Province which is rich in selenium-enriched soil resources,is selected as the research object,and an evaluation index system for the development and utilization of selenium-enriched soil for agricultural land in Yuanzhou District is constructed from the three dimensions of natural quality,economic quality and soil environmental quality of agricultural land.The evaluation was carried out separately,and the comprehensive index of the suitability of agricultural land selenium-enriched soil development and utilization was obtained by using the method of step-by-step correction of the restriction coefficient.Based on the suitability of resource development and utilization,combined with soil environmental quality and ecological protection construction,comprehensive utilization zoning was carried out,and corresponding countermeasures and suggestions were put forward.(1)The overall level of natural quality of agricultural land in Yuanzhou District is in the second-class area,and the overall natural quality is relatively high.The area of second-class land accounts for the highest proportion,and the first-and second-class land are mainly concentrated in the central part of Yuanzhou District and the townships on the north bank of Yuanhe River.Jinrui Town,Xintian Town and Zhuting Town have the greatest natural potential for development and utilization.Wentang Town,Nanmiao Town,Hongjiang Town,and Xinfang Town in the southern part of Yuanzhou District have a large area of third-and fourth-grade places with high terrain slope,complex and diverse terrain,and the natural quality is not high,and should be strengthened.(2)The agricultural land with first-class economic quality accounts for the highest proportion,and it is located in various towns on the north bank of Yuanhe River.It has great development and utilization value and should be fully and reasonably used.Hongtang Town,Hongjiang Town,Nanmiao Town and Xinfang Town in the northern border area and the southern mountainous area have uneven terrain,good economic quality,and have certain development and utilization value,but their development and utilization are difficult.(3)The overall pollution of soil sampling points is still at a clean level,and most of Yuanzhou District has no pollution risk.Only 3 soil sample sites were classified as moderately or heavily polluted.There is local pollution of cadmium and arsenic,mainly in Binjiang Town and Tiantai Town;about 10% of Yuanzhou District has poor soil environmental quality,mainly in Hongtang Town,Xinfang Town and Binjiang Town In the area,Shuijiang Town and Zhaixia Town also exist sporadically.(4)The overall suitability for development and utilization is at a moderately suitable level,and the soil area of highly suitable and moderately suitable agricultural land accounts for more than 68%.It is distributed in the northern part of Yuanzhou District,and towns such as Xicun Town and Tiantai Town on the north bank of Yuanhe River,with a small amount of distribution.In the northeast corner of Yuanzhou District;the area of low-grade suitable area and unsuitable area is relatively low,concentrated in the southern mountainous area,the content of selenium in the soil is not high,and the large terrain slope is the main limiting factor.From the perspective of spatial distribution,the agglomeration is strong.From the perspective of different towns,Zhuting Town and Xintian Town have the highest suitability for development and utilization,followed by Xicun Town,Jinrui Town and Lucun Town.Or closer to 12,000 hectares.From the perspective of different land types,most of the selenium-enriched arable land and garden soil have good conditions for development and utilization,and some of the selenium-enriched forest land has a low degree of suitability.The limiting factors are high terrain slope and low selenium content.Xicun Town has the most highly suitable arable land and forest land,followed by Tiantai Town.(5)The scope of agricultural land in Yuanzhou District is divided into four types:selenium-enriched industry development,basic agricultural protection,soil environment management,and ecological environment management and protection.The camellia oleifera industry is an important development space.The basic agricultural protection area is the backup space for the development of the selenium-enriched industry.The soil environment management area is the space with utilization risks,and the ecological environment management area is the space where development and utilization are prohibited.Countermeasures and suggestions are put forward for these four types. |
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