镉超标耕地的安全利用评价与优化配置方案

发布时间：2018-01-22 20:16

本文关键词： 土地管理镉耕地重金属安全利用优化方案　出处：《中国农业资源与区划》2017年05期 　论文类型：期刊论文

【摘要】：[目的]提出分不同pH、不同地类对重金属超标耕地安全利用评价思路,并以A镇为例探讨了以地类转换、作物调整、园艺措施或其他适当的修复措施以及农用地转为非农用地等措施为途径的优化配置方案。[方法]文章选用单因子污染指数评价法,分不同pH值、水田、旱地、菜地对重金属镉超标耕地进行安全利用评价,采用反距离加权插值法得到整个研究区镉含量空间分布图。基于安全利用评价结果及其空间分布特征,分不同pH值探讨了以地类转换、作物调整、园艺措施或其他适当的修复措施以及农用地转为非农用地等措施为途径的优化配置方案。[结果]通过进一步分析评价结果空间分布特征发现A镇土壤大部分无污染,其中镉严重污染的水田土壤面积大于旱地土壤面积,空间分布主要受当地人为活动影响。[结论]优化配置方案有效降低了镉超标耕地的相对污染程度和重金属对农产品安全的影响程度。
[Abstract]:[Objective] to put forward the idea of evaluating the safe utilization of heavy metals in cultivated land with different pH and different types of land, and take town A as an example to discuss the transformation of land types and the adjustment of crops. Horticultural measures or other appropriate restoration measures as well as agricultural land to non-agricultural land such as measures as the way of optimal allocation. [Methods] the method of single factor pollution index was used to evaluate the safe utilization of heavy metal cadmium in farmland with different pH value, paddy field, dry land and vegetable field. The spatial distribution map of cadmium content in the whole study area was obtained by using inverse distance weighted interpolation method. Based on the results of safety utilization evaluation and its spatial distribution characteristics, different pH values were used to discuss the transformation of soil type and crop adjustment. Horticultural measures or other appropriate restoration measures as well as agricultural land to non-agricultural land such as measures as the way of optimal allocation. [Results through further analysis of the spatial distribution characteristics of evaluation results, it was found that most of the soils in town A had no pollution, and the soil area of paddy fields seriously polluted by cadmium was larger than that of dry land. Spatial distribution is mainly affected by local activities. [Conclusion: the optimal allocation scheme can effectively reduce the relative pollution degree of cadmium excess cultivated land and the influence of heavy metals on the safety of agricultural products.
【作者单位】：中国地质大学(北京)土地科学技术学院;国土资源部土地整治重点实验室;
【基金】：国土资源部公益性行业科研专项课题“重金属超标农用地安全利用管控技术研究”(201511082-2)
【分类号】：F323.211;X53
【正文快照】： 0引言“万物土中生,有土斯有粮”。土壤是孕育万物的摇篮,人类文明的基石。2015年7月在中国科技会堂联合举办了“土壤与生态环境安全——国际土壤年在中国”高层论坛上赵其国院士、沈仁芳所长等众多专家学者提出土壤安全问题已经严重制约着国家粮食安全、食品安全、水安全和生

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