崇州市典型农田土壤中铬的含量状况与空间分布  

Chromium Content Status and Spatial Distribution in Typical Farmland Soils of Chongzhou

作　　者：翁倩[1] 李启权[1] 代天飞 张少尧 袁大刚[1] 陈冠桦[1] 

机构地区：[1]四川农业大学资源学院,四川温江611130 [2]成都土壤肥料测试中心,成都610041

出　　处：《四川农业大学学报》2015年第4期408-414,共7页Journal of Sichuan Agricultural University

基　　金：国家自然科学基金项目(41201214)

摘　　要：【目的】了解成都平原崇州市典型农田土壤中铬的含量状况与空间分布特征。【方法】采用混合取样的方法采集68个土壤样品,对铬含量进行室内分析测试,以样点测试结果为基础,采用地统计学和方差分析等方法,研究分析土壤中的铬含量状况与空间分布特征。【结果】研究区土壤铬含量在76.74~127.90mg/kg之间,平均为99.85mg/kg,没有样本点超过国家土壤环境质量二级标准。地质累积指数法评价表明研究区土壤有17.65%的样点受到铬的影响,总体呈现低等程度的潜在生态风险。半方差分析表明,土壤铬的块金值与基台值之比为0.30,具有中等空间相关性。铬含量的空间分布规律明显,表现出由西南向东北逐渐升高的趋势。含量差异主要受成土母质的影响。【结论】研究区土壤铬含量符合农田含量标准,其空间差异受结构因素与随机因素共同影响,总体呈现低生态风险。【Objective】The aim of the study was to explore the chromium content and spatial distribution in Chongzhou typical farmland of Chengdu plain.【Method】68soil samples were collected and their chromium content was analyzed.On the basis of the sample test results,spatial distribution of chromium was investigated using geostatistical methods and variance analysis.【Results】The soil chromium content in the area was ranged from 76.74 mg/kg to 127.90 mg/kg,with an mean value of 99.85mg/kg.All samples were lower than that of the national soil environmental quality standards.Geoaccumulation index evaluation showed that 17.65% of soil samples were affected by chromium,suggesting that overall potential ecological risk was low.Semivariance analysis showed that the ratio of nugget to sill was 0.30,with a moderate spatial correlation.Spatial distribution of chromium was significant and soil chromium increased from southwest to northeast.The difference was mainly affected by soil parent material.【Conclusion】The soil chromium contents meet the standards of soil farmland,indicating that ecological risk is low.

关 键 词：成都平原 农田土壤 铬 空间分布 影响因素 

分 类 号：X53[环境科学与工程—环境工程]