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当前位置: 首页 > 文章 > 广州市农业土壤As和Cd污染及其对景观异质性的多尺度响应 应用生态学报 2016,27 (10) 3283-3289
Position: Home > Articles > Agricultural soil contamination from As and Cd and its responses to landscape heterogeneity at multiple scales in Guangzhou,China Chinese Journal of Applied Ecology 2016,27 (10) 3283-3289

广州市农业土壤As和Cd污染及其对景观异质性的多尺度响应

作  者：
徐慧秋;黄银华;吴志峰;程炯;李铖
单  位：
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;广州大学地理科学学院
关键词：
重金属污染;景观异质性;多尺度;偏冗余分析
摘  要：
以广州市为例,基于2005年641个农业表层(0~20 cm)土壤样点数据和土地利用数据,采用单因子污染指数、Pearson/Spearman相关分析和偏冗余分析方法,探讨土壤As和Cd污染及其与3种网格尺度(2 km×2 km、5 km×5 km和10 km×10 km)景观异质性的定量关系,识别特定尺度起决定作用的景观异质因子.结果表明:土壤As和Cd均存在不同程度的污染,超标率为5.3%和7.2%;3个尺度上,土壤As和Cd污染普遍与成土母质构成、河流/道路密度和特定土地利用类型的景观格局呈显著相关,成土母质、污水灌溉和人类活动(如工业交通活动、农药化肥施用等)可能是农业重金属输入的主要途径;3组景观异质因子(即成土母质、距离-密度变量和景观格局)可解释土壤As和Cd污染变异的12.7%~42.9%,解释力度随网格尺度递增,并且在特定尺度上起决定作用的景观异质因子因尺度而异.成土母质对土壤污染变异的贡献在2和10 km网格尺度较大,而景观格局和距离-密度变量的贡献整体随网格由小到大递增.调整农用地分布和优化景观格局是减少局部尺度上土壤重金属输入的重要途径,应引起城市规划和决策者的足够重视.
译  名：
Agricultural soil contamination from As and Cd and its responses to landscape heterogeneity at multiple scales in Guangzhou,China
作  者：
XU Hui-qiu;HUANG Yin-hua;WU Zhi-feng;CHENG Jiong;LI Cheng;School of Geographical Sciences,Guangzhou University;Guangdong Key Laboratory of Agricultural Environment Pollution Integrated Control,Guangdong Institute of Eco-environmental Science and Technology;Guangdong Guodi Institute of Resource and Environment;
关键词：
trace metal contamination;;landscape heterogeneity;;multi-scale;;partial redundancy analysis
摘  要：
Based on 641 agricultural top soil samples(0-20 cm) and land use map in 2005 of Guangzhou,we used single-factor pollution indices and Pearson/Spearman correlation and partial redundancy analyses and quantified the soil contamination with As and Cd and their relationships with landscape heterogeneity at three grid scales of 2 km×2 km,5 km×5 km,and 10 km×10 km as well as the determinant landscape heterogeneity factors at a certain grid scale.5.3% and 7.2% of soil samples were contaminated with As and Cd,respectively.At the three scales,the agricultural soil As and Cd contamination were generally significantly correlated with parent materials' composition,river/road density and landscape patterns of several land use types,indicating the parent materials,sewage irrigation and human activities(e.g.,industrial and traffic activities,and the additions of pesticides and fertilizers) were possibly the main input pathways of trace metals.Three subsets of landscape heterogeneity variables(i.e.,parent materials,distance-density variables,and landscape patterns) could explain 12.7%-42.9% of the variation of soil contamination with As and Cd,of which the explanatory power increased with the grid scale and the determinant factors varied with scales.Parent materials had higher contribution to the variations of soil contamination at the 2and 10 km grid scales,while the contributions of landscape patterns and distance-density variables generally increased with the grid scale.Adjusting the distribution of cropland and optimizing the landscape pattern of land use types are important ways to reduce soil contamination at local scales,which urban planners and decision makers should pay more attention to.

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