ZHANG Ting,FU Wa-li,YUAN Bo,et al.Effectiveness and Delayed Geochemical Hazard Analysis of Various Forms of Soil Zn Element in Water-level-fluctuating Zones in Xiaojiang Watershed of Three Gorges Reservoir Area[J].Research of Soil and Water Conservation,2011,18(06):79-83.
三峡库区小江流域消落带土壤Zn各形态有效性及缓变型地球化学灾害分析
- Title:
- Effectiveness and Delayed Geochemical Hazard Analysis of Various Forms of Soil Zn Element in Water-level-fluctuating Zones in Xiaojiang Watershed of Three Gorges Reservoir Area
- Keywords:
- water-level-fluctuating zones in Xiaojiang watershed; soil; Zn element; delayed geochemical hazard
- 分类号:
- S153.6+1;X53
- 摘要:
- 通过分析三峡库区小江流域消落带土壤Zn全量、形态及有效性，并基于缓变型地球化学灾害数学模型，研究了区域内土壤Zn的缓变型地球化学灾害特征。结果表明：研究区域内全量Zn的平均值为123.88 mg/kg，高于国家土壤环境质量一级标准，但明显低于二级标准。Zn的酸溶态、可还原态、可氧化态、残渣态平均值占全量平均值的百分比分别为2.93%、4.42%、8.71%和83.94%，有效态占4.51%。酸溶态、可还原态、可氧化态与有效态相关性密切；可还原态和可氧化态含量对有效态含量贡献较大。在小江流域消落带的土壤中Zn具有缓变型地球化学灾害特征，土壤中Zn有可释放总量向次生相态释放转化的趋势，其缓变型地球化学灾害临界值为130.67 mg/kg，32%的土壤样品具有爆发Zn缓变型地球化学灾害的可能性。
- Abstract:
- The total content and speciation, effectiveness of Zn element in the water-level-fluctuating zones in Xiaojiang Watershed of Three Gorges Reservoir Area had been analyzed. And a study on the delayed geochemical hazard character of Zn element in regional area soil had been carried out based on the delayed geochemical hazard mathematic model. The results shows: the average amount of total content of Zn element in the study area is 123.88 mg/kg, which is higher than primary state soil environment quality standards, and which is lower than the second state soil environment quality standards. The percentage of acid soluble state, recoverable state, oxidation state, and residual state in total amount is 2.93%, 4.42%, 8.71% and 83.94%, available form accounted for 4.51%. Through correlation analysis, acid-soluble state, reducible state and oxidable state were closely associated with the effective state. Reducible and oxidable contents contributed greatly to the available contents. Through analyzing measured data, it was found out that Zn element has delayed geochemical hazard character in soil in water-level-fluctuating zones in Xiaojiang watershed. Zn element form transform trends can be described as release of total content to release and transform of secondary morphology. The threshold of delayed geochemical hazard is 130.67 mg/kg. About 32% of soils have the possibility to outbreak as delayed geochemical hazard.
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备注/Memo
收稿日期:2011-5-31;改回日期:2011-7-1。
基金项目:重庆市移民局课题(200909)
作者简介:张婷(1988- )，女，山西人，在读硕士研究生，主要从事土壤环境与土地利用研究。E-mail：543984748@qq.com
通讯作者:傅瓦利(1954- )，女，山西籍重庆人，博士，教授，硕士生导师，主要从事土壤地理和土地利用研究。E-mail：fuwali@swu.edu.cn