区域农用地土壤重金属超标评价与种植适宜分区

农用地是最宝贵的农业资源、最重要的生产资料,是人类最宝贵的财富。本文以江苏省某镇为例,采用单因子指数评价法、内梅罗综合指数评价法和潜在生态风险评价法对区域农用地土壤进行重金属超标评价,综合三种评价结果提出区域农用地安全利用等级和安全利用综合分区划分方案。基于安全利用综合分区和原有农业区划进行叠置分析后,以精细化管控用地为出发点,提出区域农业种植适宜区划分方案。结果表明:文章针对安全利用区、基本安全利用区、低风险监控区、中风险预警区和高风险限制区这5种安全利用综合分区,定性的提出了分区内涵、主要特征、安全水平提出相应的利用对策。(2)划分出4种区域农业种植适宜区:稻-茶-竹-栗-果适种区、林-竹-茶-果-栗适种区、稻-油-麦-豆-桑-瓜适种区、稻-麦-油-豆-百合、芦苇经济作物适种区。乡镇尺度区域农用地土壤重金属超标评价和种植适宜分区研究可为区域土地资源的合理、高效安全利用提供一定的科学依据。

Heavy Mental Contamination Evaluation and Planting Suitable Zoning for Soils in Regional Agricultural Land

Agricultural land is the most precious agricultural resources for human being.In this paper,a typical town in Jiangsu Province was taken as an example and was divided the safe utilization and suitable planting zones of agricultural land in order to make land refined control and management in town scale.The single factor index evaluation,Nemerow index evaluation and potential ecological harm index evaluation have been used to evaluate heavy metal contamination in regional agricultural land.Based on contamination evaluation results,the division for safe use and suitable planting zones of agricultural land was proposed.The results showed that there were 5 different comprehensive safe utilization zones:safe utilization zone,main safe utilization zone,low risk monitoring zone,medium risk warning zone and high risk limiting zone.The different strategies were carried out based on different purposes,main characters,safety levels of agricultural land in town scale.There were 4 different agricultural planting suitable zones:rice-tea-bamboo-chestnut-fruit;forest-bamboo-tea-fruit-chestnut;rice-oilseed rape-wheat-bean-mulberry-melon;rice-wheat-oilseed rape-bean-edible lily/reed.The results on regional agricultural land safe use would provide some certain scientific bases for ensuring rational and efficient utilization for land resources.