摘要
土壤重金属元素异常下限值的确定对区域土壤环境评价具有重要意义,本研究基于Arc GIS技术与分形理论对喀斯特小流域土壤重金属Cd元素的异常下限值进行研究,通过含量-面积方法确定了喀斯特小流域土壤重金属Cd元素异常下限值为1.07 mg/kg。通过与传统方法 (平均值加两倍标准离差)和85%累计频率法进行对比,表明分形方法确定的异常区域是有效的、合理的。
It is significant to determine the minimum thresholds of heavy metals in soil for regional environmental quality. The minimum threshold of Cd in soil of karst basin was studied based on ArcGIS and fractal method. The concentration-area fractal method was used to determine the minimum threshold of Cd in soil of karst basin, which was 1.07 mg/kg. Compared with the results obtained by traditional methods （x＋2S） and 85% of the cumulative frequency methods, the anomaly extension determined by fractal method was effective and reasonable.
出处
《湖北农业科学》
2015年第6期1361-1364,共4页
Hubei Agricultural Sciences
基金
2014广西研究生教育创新计划项目(YCSW2014184)
广西软科学研究计划课题(11217002-31)
关键词
分形
CD
异常下限
土壤
喀斯特
流域
fracal
Cd element
minimum threshold
soil
Karst
basin
