| 成都平原核心区土壤砷空间变异特征及影响因素 |
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| 引用本文： | 余雪莲,李启权,彭月月,李萌,李艾雯,王昌全.成都平原核心区土壤砷空间变异特征及影响因素[J].环境科学研究,2020,33(4):1005-1012. |
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| 作者姓名： | 余雪莲 李启权 彭月月 李萌 李艾雯 王昌全 |
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| 作者单位： | 四川农业大学资源学院, 四川 成都 611130 |
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| 基金项目： | 四川省科技计划项目（No.2019YJ0433）；四川省科技厅重点研发项目（No.2017SZ20188） |
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| 摘 要： | 掌握土壤污染物的空间变异特征及其影响因素是开展土壤污染防治的前提.基于189个表层（0~20 cm）土壤样品，运用经典统计学和地统计学方法分析了成都平原核心区土壤中w（As）的空间分布特征，并探讨了成土母质、水系和土地利用方式对土壤中w（As）的影响.结果表明:①研究区土壤中w（As）在3.74~35.32 mg/kg之间，平均值为14.64 mg/kg，其中超过GB 15618-2018《土壤环境质量农用地土壤污染风险管控标准（试行）》风险筛查值的采样点仅占总采样点的7.53%.②地累积指数分析结果表明，研究区土壤As处于无污染至轻度污染状态.③研究区土壤中w（As）总体呈西高东低的趋势，高值主要分布在都江堰市的南部、崇州市的东北部以及邛崃市与新津县接壤处.土壤As的块金系数为26.60%，属于中等程度变异，受结构性因素和随机性因素的共同影响.④由于人类活动的增强，成土母质对土壤中w（As）的影响已经不显著.距水系越近，土壤中w（As）越高.土地利用方式对土壤中w（As）空间变异的影响程度最大，不同土地利用方式下土壤中w（As）差异显著，表现为园林地>农林地>水稻-小麦轮作>水稻-油菜轮作>水稻-蔬菜轮作.研究显示，成都平原核心区土壤中w（As）总体偏低，高值区主要分布在都江堰市的南部、崇州市的东北部和邛崃市与新津县接壤一带；土地利用方式对土壤中As空间变异的影响超过水系和成土母质.
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| 关 键 词： | 砷(As) 空间分布 成土母质 水系 土地利用方式 成都平原核心区 |
| 收稿时间： | 2019/3/19 0:00:00 |
| 修稿时间： | 2019/7/22 0:00:00 |
Spatial Variability and Influencing Factors of Soil Arsenic in the Core Area of Chengdu Plain |
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| YU Xuelian,LI Qiquan,PENG Yueyue,LI Meng,LI Aiwen,WANG Changquan.Spatial Variability and Influencing Factors of Soil Arsenic in the Core Area of Chengdu Plain[J].Research of Environmental Sciences,2020,33(4):1005-1012. |
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| Authors: | YU Xuelian LI Qiquan PENG Yueyue LI Meng LI Aiwen WANG Changquan |
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| Affiliation: | Resources College, Sichuan Agricultural University, Chengdu 611130, China |
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| Abstract: | Understanding the spatial variation characteristics and the influencing factors of soil pollutants is essential for prevention of soil pollution. Based on 189 topsoil samples (0-20 cm) collected in the core area of the Chengdu Plain, we used classical statistical and geostatistical methods to analyze the spatial distribution of soil arsenic (As) content and to evaluate the relationships of soil As with parent materials, water systems and land use types in this area. The results showed that:(1) The soil As content in the study area ranged from 3.74 to 35.32 mg/kg, with an average of 14.64 mg/kg, and the soil As content of only 7.53% of the soil samples exceed the risk value of the National Soil Environmental Quality Standards for Risk Control of Soil Pollution on Agricultural Land (GB 15618-2018). (2) The calculated geological accumulation index indicated that the soils were not polluted or slightly polluted by As. (3) Soil As contents in the study area were generally high in the west and low in the east, with higher concentration occurred in the south of Dujiangyan City, northeastern of Chongzhou City and the border of Qionglai City with Xinjin County. The nugget/sill ratio of soil As was 26.6%, which suggested that the spatial dependence of soil As content was moderate and the spatial distribution was determined by both structural factors and random factors. (4) The effects of parent materials on soil As content were weak because of the enhancement of human activities. The water system also has impacts on soil As content that the shorter the distance to the river, the higher the As content. The land use types had the greatest impact on the spatial variability of soil As content. The soil As content varied significantly under different land use types, which is represented by the following order:garden land > agricultural and forestry > rice and wheat rotation > rice and rape rotation > rice and vegetable rotation. It is concluded that the soil As content in the core area of the Chengdu Plain is generally low, and the relatively high values were mainly distributed in the south of Dujiangyan City, northeastern Congzhou City, and the border of Qionglai City with Xinjin County. The relative importance of the effects of land use types on the spatial variation of As in soil was larger than that of water system and soil parent materials. |
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| Keywords: | soil arsenic spatial distribution soil parent material water system land use type Chengdu Plain |
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