成都平原土壤Hg和Pb的空间分布及影响因素研究  

Spatial Distribution and Influencing Factors of Soil Mercury and Lead in Chengdu Plain

作　　者：代英[1] 张世熔[1] 李婷[1] 魏甦[1] 刘英华[1] 

机构地区：[1]四川农业大学资源环境学院四川省土地信息重点实验室,四川雅安625014

出　　处：《农业环境科学学报》2006年第3期745-750,共6页Journal of Agro-Environment Science

基　　金：四川省教育厅人才培养基金(01LA02);四川省青年科技基金(04ZQ026-018)

摘　　要：以土壤有机质层Hg和Pb为研究对象,在ArcGIS9.0平台上运用地统计学、缓冲区分析和叠置分析等方法研究了成都平原核心区域土壤Hg和Pb含量的空间分布特征及其主要的影响因素。结果表明,该区土壤Hg和Pb的含量分别为(0.15±0.13)mg·kg-1和(25.41±9.95)mg·kg-1。土壤Hg的高值区域位于成都市中心城区(0.5～0.8mg·kg-1)和都江堰城区(0.4～0.5mg·kg-1),并以此为中心向四周递减;土壤Pb的高值区位于成都市中心城区、新都和青白江的部分区域(35￣46mg·kg-1),并向两侧逐渐减少。影响因素分析表明,不同城区固体垃圾排放量对该区土壤Hg和Pb的含量有一定的影响;样点距中心城区的距离(<4km)与土壤Hg含量关系不显著,而与Pb含量呈显著指数相关关系;方差分析和缓冲区分析表明,土壤Hg和Pb在不同的路段和流域具有显著性差异。In order to assess the amount and spatial distribution of soil mercury and lead in Chengdu plain, 67 samples were collected from paddy soil, around roadside soil and riverside soil of 7 districts and geostatistical tools were used. The results showed that, the content of soil Hg and Pb was （0.1 5±0.1 3） mg. kg^-1 and （25.41 ±9.95） mg. kg^-1, respectively. The mercury level in the downtown of Chengdu City and the centre of Dujiangyan district was the highest and range from 0.5-0.8 mg.kg^-1. Pb content in soil maintained not more than 50 mg.kg^-1 and not surpassed environmental quality standard for soils. The greatest variances of soil Pb content were found in Dayi district, the south west of Chengdu Plain and along Chongzhou, Xinjing and Qionglai district. Furthermore, this paper discussed the main influencing factors of soil Hg and Pb content, such as municipal solid waste, distances to the downtown, roads and rivers. The results showed that, the amount of municipal solid waste in Wuhou and Qingyang district was higher than that in Jinjiang, Qingbaijiang and Longquanyi district, and the mean values of soil Hg （0.78 mg. kg^-1） in Qingyang district and that of rig （0.60 mg. kg^-1） in Wuhou district exceeded environmental quality standard for soils. Correlated analyses of distances to the downtown （〈4 km to the city center） indicated that regression of soil Hg was poor; however, soil Pb has a good correlation. One of reasons was that there were many roads, highway near the downtown. The differences between Soil Pb content nearby Chengyu, Chengpeng and around city highways had less significance, but the difference between these three highways and Chengwenqiong highway was significantly high （P〈0.01）. Results of ANOVA Analyses and buffer analyses indicated that the differences between contents of soil Hg and Pb in different drainage basin are significant. The mean content of soil Pb （31.33 mg. kg^-1） near the Fuhe river was highest in these sampling points near rivers.

关 键 词：HG PB 空间分析 新复极差法 缓冲区分析 

分 类 号：X144[环境科学与工程—环境科学]