摘要
设施菜地重金属累积日益突出,本文评估了唐山市设施菜地土壤重金属累积并分析其有效态影响因素.结果表明土壤Cd、Cu、Ni、Pb和Zn总量均值分别为0.20、51.98、20.85、20.93、120.15 mg·kg^(-1),有效态含量均值分别为0.065、7.92、0.62、0.57、11.29 mg·kg^(-1).地累积指数表明Cd、Cu和Zn污染的土壤样点比例分别为92.5%、68.7%和50.8%,且Cd、Cu和Zn的主要来源为粪肥和化肥输入,而Ni和Pb则为自然源.设施菜地土壤重金属累积量与肥料输入和种植年限呈正比,而p H越低土壤重金属有效态含量会增加、化肥施用增加可提高重金属有效态含量.土壤总磷与Cu和Zn的地累积指数关系表明,Cu和Zn的来源可能受磷肥施用的影响更大.另外,化肥和粪肥施用量差异可能是导致重金属累积空间差异的重要因素.
Heavy metal accumulation in greenhouse vegetable soils is becoming increasingly prominent.The present study assessed the accumulation levels of heavy metals in greenhouse vegetable soils from Tangshan city.The factors impacted on the availability of heavy metals were also analyzed.The results indicated that the mean total concentrations of Cd,Cu,Ni,Pb and Zn in soils were 0.20,51.98,20.85,20.93,and 120.15 mg·kg^(-1),and the mean available contents of the metals were 0.065,7.92,0.62,0.57,and 11.29 mg·kg^(-1),respectively.The suggested that about92.5%,68.7%and 50.8%of the soil samples were contaminated by Cd,Cu and Zn.Cd,Cu and Zn accumulated in greenhouse vegetable soil were mainly derived from the application of manure and chemical fertilizers,while Ni and Pb were originated from natural sources.The accumulation levels of heavy metals in greenhouse vegetable soils were positively associated with fertilizer input and Igeo planting years.However,lower soil p H and higher chemical fertilizer input usually increased the available concentrations of heavy metals.The relationships between total phosphorus and the of Cu and Zn in soil indicated that Cu and Zn in greenhouse vegetable soils might be more seriously influenced by phosphate fertilizers.In addition,the differences of manure and chemical fertilizer input might affect the spatial variations of heavy metals in greenhouse vegetable soils.
作者
韦炳干
虞江萍
曹志强
孟敏
李海蓉
杨林生
李峰
WEI Binggan;YU Jiangping;CAO Zhiqiang;MENG Min;LI Hairong;YANG Linsheng;LI Fen(Key Laboratory of Land Surface Pattern and Simulation,Institute of Geographic Sciences and Natural Resources Research,Chinese Academy of Sciences,Beijing,100101,China;College of Resources and Environment,University of Chinese Academy of Sciences,Beijing,100049,China;Tianjin Institute of Agriculture Resources and Environment Sciences,Tianjin,300192,China)
出处
《环境化学》
CAS
CSCD
北大核心
2021年第9期2649-2657,共9页
Environmental Chemistry
基金
国家重点研发计划(2016YFD0801004)资助。
关键词
设施菜地
土壤
重金属
有效态
地累积指数
greenhouse vegetable
soil
heavy metal
availability
geo-accumulation index
