土壤砷空间分布特征及其与地理要素的关联分析  

Spatial Variation of Soil Arsenic and Correlation Analysis with Geographical Factors

作　　者：王梅霞 冯文兰[1] WANG Meixia;FENG Wenlan(College of Resources and Environment,Chengdu University of Information Technology,Chengdu 610225,China;Xinjiang Climate Center,Urumqi 830002,China)

机构地区：[1]成都信息工程大学资源环境学院,四川成都610225 [2]新疆气候中心,新疆乌鲁木齐830002

出　　处：《环境科学与技术》2019年第9期106-111,共6页Environmental Science & Technology

基　　金：四川省教育厅自然科学重点项目（18ZA0110）

摘　　要：为研究平原-丘陵-山地复杂地形区的土壤砷含量分布特征及其与地理环境要素间的关系,文章采用地统计法与地理信息系统空间分析相结合对研究区土壤砷含量的空间变异规律进行了分析,构建了复杂地形区土壤砷含量与地理要素的关联模型。结果表明:随着地形从低到高,研究区土壤砷含量由低到高分布,空间上呈现从东南向西北逐渐递增趋势,东南部地区砷含量最低;土壤砷与土壤岩性特征、海拔呈显著正相关(P<0.05),相关系数分别是0.213和0.251,与纬度呈显著负相关。因此,以海拔、岩性和纬度作为自变量,土壤砷为因变量,构建了土壤砷多元线性逐步回归模型,模型验证显示普通克里金插值所得的预测结果与实测值间较吻合,相关系数为0.67,决定系数为0.45,均方根误差为1.29。To study the distribution characteristics of soil arsenic content and its relationship with geographical environmental factors in the complex terrain areas of plain, hill and mountain, the spatial variation law of soil arsenic content in the study area was analyzed by combining Geostatistics and Geographic Information System, and the correlation model between soil arsenic content and geographical factors in the complex terrain areas was constructed. The results showed that: with the topography from low to high, the soil arsenic content in the study area was distributed from low to high. Soil arsenic was positively correlated with soil lithology and elevation(P<0.05), and the correlation coefficients were 0.213 and 0.251 respectively, and negatively correlated with latitude. Therefore, taking altitude, lithology and latitude as independent variables and soil arsenic as dependent variables, a multivariate linear stepwise regression model of soil arsenic was constructed. The model verification showed that the predicted results obtained by ordinary Kring interpolation were in good agreement with the measured values, with a correlation coefficient of 0.67, a determination coefficient of 0.45 and a root-mean-square error of 1.29.

关 键 词：土壤砷 空间变异 地理要素 平原-丘陵-山地复杂地形区 

分 类 号：X14[环境科学与工程—环境科学]