【摘要】 GIS与地统计学已广泛运用于土壤科学的研究。为调察研究玄武湖公园内陆区域土壤重金属污染情况及空间分布的特征,为污染评估治理提供可视化的科学依据,本文采集并分析了玄武湖内陆地区0~20 cm土壤中Cr、Cd、Ni、Pb、Zn和Cu 6种元素含量,对其进行描述性统计分析判断污染情况,并利用Arc GIS分析其污染情况及空间特征,结果表明,Cd超标率高达97.5%且平均值0.25高于国家一级标准1.23倍,存在轻微污染,其他5个元素均值均低于一级标准且超标率均低于21%,基本不存在污染的情况。从空间分布来看,Pb、Zn和Cu含量从内向外呈增大趋势,Cr、Ni整体浓度值相对偏小,大部分区域含量均在中值附近或以下,以上5种元素块基比均在0.5左右,含量及分布均是由随机因素及结构性因素共同控制,而Cd块基比仅0.028因而其分布规律则主要受结构性因素影响。更多还原

【Abstract】 GIS and Geostatistics have been already widely used in soil science research. In order to investigate the situation of soil heavy metal pollution of Xuanwu Park and spatial distribution characteristics,and to provide visualization,scientific basis for governance or evaluation of pollution,we collected and analyzed the contents of Cr,Cd,Ni,Pb,Zn,Cu of inland soil about 0 ~ 20 cm depth in Xuanwu Park. The data were analyzed by descriptive statistics and the pollution situation and spatial features were analyzed by Arc GIS. The results showed that the exceed standard rate of Cd was 97. 5% and the mean was 0. 25,1. 23 times higher than the national standard,there was a slight pollution. All of the other five elements had no pollution as means were lower than the standard level and exceed the standard rate lower than 21%. From the spatial distribution,Pb,Zn,Cu content showed a trend of increasing in the area,and concentrations of Cr,Ni were relatively small,most of the region was near or below the median,the ratios of nugget and still of the five elements above were about 0. 5,it meant that content and distribution were controlled by random factors and structural factors,while the distribution of Cd was mainly affected by structural factors as its ratio was just 0. 028.更多还原