摘要
中国幅员辽阔,土壤类型复杂多样,全国采用统一的土壤铜环境标准,会造成局部地区土壤生态风险评估出现误判.为了开展精细化区域环境管控,亟需建立区域性土壤铜环境基准.本文基于土壤酸碱度、有机碳和阳离子交换量与物种敏感度分布曲线确定的铜生态阈值之间的关系,估算中国省级区域不同土地利用类型土壤铜的环境基准值,继而结合中国土壤环境浓度,对现行标准进行初步生态风险评估.研究表明:①不同省级区域土壤中铜的环境基准值存在较明显差异,空间分布符合南低北高的规律;②农用地土壤现行标准对土壤铜风险存在误估情况,且该标准对土壤铜风险误估程度在地域分布上存在明显分界线;③现行标准的区域适用性不足,区域性环境标准的制定迫在眉睫.本文所得中国土壤铜的区域分级环境基准为新标准的建立提供了科学依据.
China is a vast country with complex and diverse soil types.Therefore,the current unified national soil standard for copper(Cu)will likely misestimate its ecological risk in some regional areas.In order to carry out precise regional environmental management and control of copper in soil,it is urgent to the establish regional environmental benchmarks.Based on soil acidity,organic carbon,cation exchange capacity,and their relationships with the ecological thresholds of Cu determined by the species sensitivity distribution curve(SSD),we computed the environmental benchmarks of copper under different land use types in provincial regions of China,and then preliminarily assessed the ecological risk of the current standard by combining with the background and environmental concentrations of Cu in the soils in China.The results showed that:①regional differences in the environmental benchmarks of Cu indicated a distribution of lower value in the south and higher value in the north;②the ecological risks of copper in agricultural areas were underestimated using the current standard,and there were obvious dividing lines in the spatial distribution of the provincial regions under the current standard;③the regional applicability of the current standard is insufficient,and it is urgent to update or develop regional environmental benchmarks of Cu in soil.This study will provide scientific basis for the establishment of regional soil environmental grading benchmarks for Cu in China.
作者
陈艳楠
钱雨欣
李志美
何伟
徐福留
CHEN Yannan;QIAN Yuxin;LI Zhimei;HE Wei;XU Fuliu(School of Water Resources and Environment,China University of Geoscience Beijing,Beijing 100083;College of Urban and Environmental Sciences,Peking University,Beijing 100871)
出处
《环境科学学报》
CAS
CSCD
北大核心
2023年第3期448-458,共11页
Acta Scientiae Circumstantiae
基金
国家自然科学基金面上项目(No.42177201)
北京市自然科学基金面上项目(No.8202042)
中央高校基本科研业务费(No.265QZ2021004)
国家级大学生创新创业训练计划项目(No.202111415042)。
关键词
土壤环境基准
铜
土壤理化性质
物种敏感度分布
土地利用类型
soil environmental benchmarks
copper
soil properties
species sensitivity distribution
land use types
