青山区土壤重金属超标范围的不确定性分析

发布时间：2018-05-08 08:23

本文选题：土壤重金属 + 空间分布　；参考：《环境科学与技术》2016年S2期

【摘要】：以武汉市青山区为研究区,基于155个样点,对Cu、Pb和Zn 3种重金属的超标范围进行了不确定性研究,采用普通克里格法对重金属含量的空间分布状况进行预测,再用指示克里格法对重金属超过背景值的超标概率进行预测,最后分别依据插值结果是否超过土壤背景值和超过背景值概率是否大于50%划分3个不同程度的超标范围。结果表明:不确定Cu、Pb和Zn是否超标的范围分别为2.59%、40.25%和15.52%,大都处于超标和未超标的交错区域。Cu的不确定范围较小,主要在研究区西北部,区域较小且集中;Pb和Zn的不确定性区域都比较大,Pb的不确定区域主要分布在东部农业区和中部的工业区以及北部部分居民区,Zn的不确定区域分布较分散。因此,在以后的工业生产以及农业活动中要注意控制减少Pb、Zn等重金属流入土壤,以免不确定区域进一步演变成超标区域。
[Abstract]:Taking Qingshan District of Wuhan City as the study area, the uncertainty of the exceeding range of Cu Pb and Zn was studied based on 155 samples, and the spatial distribution of heavy metal content was predicted by ordinary Kriging method. Then the indicator Kriging method is used to predict the probability of heavy metals exceeding the background value. Finally, according to whether the interpolation results exceed the soil background value and the probability of exceeding the background value is more than 50%, three different degrees of surpassing range are divided. The results show that the range of uncertainty of Cu Pb and Zn exceeding the standard is 2.590.25% and 15.522%, respectively, and the uncertainty range of Cu is small, mainly in the northwestern part of the study area. The uncertain regions with relatively small concentration of Pb and Zn are mainly distributed in the eastern agricultural region and the industrial zone in the middle of the region, and the distribution of Zn in some residential areas in the north is more dispersed. Therefore, in the future industrial production and agricultural activities, attention should be paid to control and reduce heavy metals, such as Pb ~ (2 +) Zn into soil, so as to avoid further evolution of uncertain areas into over-standard areas.
【作者单位】：华中农业大学资源与环境学院农业部长江中下游耕地保育重点实验室;
【基金】：中央高校基本科研业务费专项(2662014PY062);中央高校基本科研业务费专项资金资助项目(2662015PY156) 国家自然科学基金面上项目(41671217)
【分类号】：X53

【相似文献】