应用生态学报2016，Vol.27Issue(10)：3283-3289,7.DOI:10.13287/j.1001-9332.201610.021
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
Agricultural soil contamination from As and Cd and its responses to landscape heterogeneity at multiple scales in Guangzhou, China
摘要
Abstract
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 2 and 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 olanners and decision makers should pay more attention to.关键词
重金属污染/景观异质性/多尺度/偏冗余分析Key words
trace metal contamination/landscape heterogeneity/multi-scale/partial redundancy analysis引用本文复制引用
徐慧秋,黄银华,吴志峰,程炯,李铖..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[J].应用生态学报,2016,27(10):3283-3289,7.基金项目
本文由国家自然科学基金项目(41501203)、广东省自然科学基金博士启动项目(2014A030310486)、广州市科技计划项目(201510010029)、广东省科技攻关项目(2013B030200004)和广东省科技创新平台项目(2015B070701017)资助 This work was supported by the National Natural Science Foundation of China (41501203),the PhD Start-up Fund of Natural Science Foundation of Guangdong Province (2014A030310486),the Science and Technology Program of Guangzhou Province (201510010029),the Key Technology R & D Program of Guangdong Province (2013B030200004) and the Project of Science and Technology Innovation Platform of Guangdong Province (2015B070701017). （41501203）
