摘要
以长春市郊区农田土壤重金属Pb为研究对象，采用野外调查和室内分析相结合的方法，分析长春市郊区不同农田土地利用类型土壤Pb的含量、空间分布特征及其生态风险。结果表明，长春市郊区农田土壤中Pb的含量范围为18．85～41．34mg／kg，90％的土壤Pb含量高于吉林省背景值，农田土壤中Pb含量的空间分布具有明显的地域特征，呈现西南和东北高，且高含量地区相对集中，自高分布岛状区中心向其周围含量逐渐降低；旱田、水田和菜地土壤的Ph含量与背景值差异不显著，在3种土壤中累积不明显。不同土地利用类型土壤中Pb含量表现为菜地〉旱田〉水田。Pb污染均处于较低水平，所有采样点土壤Pb污染均属于轻度污染；不同土地利用类型土壤中Ph平均潜在生态风险由高到低为菜地〉旱田〉水田。
Pb in the farmland surface soil of Changchun suburb was taken as the main research object.The field research and laboratory analysis were used to investigate the soil Pb content and spatial distribution characteristics and its ecological risk of different farmlands.The results showed that soil Pb contents of Changchun suburb farmland were in the range of 18.85- 41.34 mg/kg,and 90% of the samples of the soil Pb contents were higher than the background value of Jilin Province.The spatial distribution of Pb contents in farmland soil had obvious geographical features,which presented that southwest and northeast soils were higher,and the high content areas were relatively concentrated and gradually reduced from the high content areas to its surroundings.The soil Pb contents in paddy field,dry field and vegetable field had insignificant difference with the background value,which indicated that Pb accumulations in dry field,paddy field and vegetable field were not significant.The order of Pb contents in different land use types was showed as follows:vegetable field > dry field > paddy field.Pb pollution was low and all samples belonged to light pollution.The average potential ecological risk of soil Pb in different land use types were vegetable field > dry field > paddy field.
出处
《安徽农业科学》
CAS
2013年第31期12303-12305,共3页
Journal of Anhui Agricultural Sciences
基金
吉林省科技发展计划项目(20110403)
关键词
长春市郊区
农田土壤
重金属PB
分布特征
生态风险
Changchun City suburb
Farmland soil
Heavy metal Pb
Distribution characteristic
Ecological risk
