摘要
在江苏省国土1/250 000多目标地球化学调查基础上,选择苏州市、吴江市、无锡市、江阴市、常州市、金坛市等45个城市公园土壤作为研究对象,系统研究了当地典型城市公园土壤中Cd、Hg、Pb、Zn、Sb、Sn、B、Se、N、稀土元素(REE)等50个元素含量及土壤pH、总有机碳(TOC)等分布特征。结果表明,城市公园土壤的微量元素分布与城区污染土壤、农田土壤有显著差异,公园土壤的重金属含量总体偏低、N与TOC含量明显低于农田土壤,在公园土壤中S、Se、Cd、Pb、Zn、TOC等元素未出现高强度的人为富集,重金属污染以轻度Hg污染为主,S、Se、Cd、Pb、TOC、pH等指标在200 cm深度内分布相对稳定、未出现元素含量在不同深度的显著变化,指示多数公园土壤的微量元素分布总体上较一般城市土壤更少受人为因素干扰,可为人为活动对城市土壤环境的影响研究提供重要的参比对象。
On the basis of the provincial multi-target geochemistrical land survey at 1∶ 250 000 scale in Jiangsu,a total of 45 city parks in the Su-Xi-Chang region,like the Panmen Park in Suzhou,the Wujiang Park in Wujiang,the Huishan Park in Wuxi,the Zhongshan Park in Jiangyin,the Five-star Park in Changzhou,the Hualuogen Park in Jintan,and so on were elected as subjects in a systematic study on distribution of pH,TOC and 50 elements,including Cd,Hg,Pb,Zn,Sb,Sn,B,F,Se,N,REEs,etc. in the soils of these parks. Results show that the distributions of trace elements in city park soils are obviously different from those in polluted urban soils and normal farmland soils. The park soils,as a whole,tend to be low in heavy metal content and significantly lower than farmland soils in N and TOC content.No intensive anthropogenic enrichment of S,Se,Cd,Pb,Zn and TOC is found in the park soils. Heavy metal pollution there is very slight and dominated with Hg,which is related to human activities. The distribution of S,Se,Cd,Pb,TOC and pH in the 0 ～ 200 cm soil layer is quite stable and does not vary much with soil depth. All the findings indicate that the distribution of trace elements in most of the park soils has rarely been disturbed by human activities as compared with that in general urban soils. Therefore,the soil environment of the city parks can be cited as reference essential to the study on impacts of human activities on urban soil environment.
出处
《土壤学报》
CAS
CSCD
北大核心
2014年第5期1035-1044,共10页
Acta Pedologica Sinica
基金
国土资源公益性行业科研专项经费项目(201111021)
国家自然科学基金项目(40873081)资助
关键词
微量元素分布
环境指示意义
土壤
城市公园
苏锡常地区
Distribution of trace elements Significance of environmental indicator Soil City park Su-Xi-Chang Region
