广东省土壤Cd含量空间分布预测

发布时间：2018-01-13 01:22

本文关键词：广东省土壤Cd含量空间分布预测?　出处：《环境科学》2017年05期 　论文类型：期刊论文

【摘要】：土壤重金属的空间格局对土壤重金属污染防治具有重要的指导意义.本文以广东省土壤Cd含量为研究对象,基于"规则"模型——Cubist以及样条插值法、反距离加权法、自然邻域法、普通克里金插值法、局部多项式插值法和径向基函数插值法等6种GIS空间插值方法,选取2 000、1 500、1 000、800、500、300、200、150及90 m这9个不同的格网尺度,构建Cd含量空间格局模型.选择不同方法的最佳预测尺度和最优模型参数,预测广东省土壤Cd含量分布.结果表明:(1)在相同尺度时Cubist方法预测结果都比传统的空间插值结果精度高,格网大小为300 m×300 m时预测精度最高.其次是样条插值法,其在1 500 m插值尺度上精度最高;(2)Cubist模型同时可以识别土壤Cd含量空间分布的驱动因子.结果表明在37个影响Cd含量的自然和人为因子中,地质类型是驱动广东省土壤Cd含量分布差异的主要因子;(3)Cd含量高值主要分布在珠三角地区及粤北少部分地区.广东省土壤Cd含量超过GB 15618~(-1)995中3级和2级标准,即大于1.0 mg·kg~(-1)和0.3 mg·kg~(-1)的面积分别约为160 km~2和2 140 km~2,约占广东省总面积的0.09%和1.18%.
[Abstract]:The spatial pattern of heavy metals in soil is of great significance to the prevention and control of soil heavy metal pollution. In this paper, the content of CD in Guangdong Province is taken as the research object. Based on the "rule" model cubist and spline interpolation method, inverse distance weighting method, natural neighborhood method, general Kriging interpolation method. The local polynomial interpolation method and the radial basis function interpolation method are six GIS space interpolation methods, and 2 000 / 1 500 / 1 000,800,500,300,200 are selected. The spatial pattern model of CD content was constructed with 9 different grid scales of 150 m and 90 m. The optimal prediction scale and model parameters of different methods were selected. The results show that the Cubist method is more accurate than the traditional spatial interpolation results in the same scale. When the grid size is 300m 脳 300m, the prediction accuracy is the highest, followed by the spline interpolation method, which has the highest accuracy on the scale of 1 500m interpolation. The cubist model can also identify the driving factors of CD spatial distribution in soil. The results showed that there were 37 natural and human factors affecting CD content. Geological types are the main factors driving the difference of CD content in soils in Guangdong Province. The content of CD in the soil of Guangdong Province was higher than that of grade 3 and grade 2 of GB 15618 ~ (-1) ~ (1) ~ (1) C ~ (2) in the Pearl River Delta region and a few parts of northern Guangdong Province. The areas above 1.0 mg 路kg ~ (-1) and 0.3 mg 路kg ~ (-1) were about 160 km~2 and 2 140 km~2, respectively. About 0.09% and 1.18 of the total area of Guangdong Province.
【作者单位】：山西农业大学资源环境学院;广东省生态环境技术研究所广东省农业环境综合治理重点实验室;
【基金】：广东省科技计划项目(2015B070701017,2014A040401059,2015A030401068) 国家自然科学基金青年科学基金项目(41601558) 广东省科学院创新平台建设专项
【分类号】：X53
【正文快照】： 广州510650)自然界Cd元素一般存在于页岩、海洋、湖相沉积物和磷灰石中[1],主要受地质作用影响[2],一般含量较低.随着人类活动的不断加强,包括工业生产加速、快速城市化、道路密度的增大、人口密集化、电子垃圾焚烧、工业三废的排放、化肥农药的施用、汽车尾气排放、矿业开采

【相似文献】