| 郁红艳,阮文权,杨广龙.冶炼厂周边农田土壤水稳性团聚体中镉的分布规律[J].农业环境科学学报,2016,35(1):80-85. |
| 冶炼厂周边农田土壤水稳性团聚体中镉的分布规律 |
| Distribution of cadmium in soil water-stable aggregates in farmland surrounding a smelter |
| 投稿时间：2015-07-13 |
| DOI：10.11654/jaes.2016.01.011 |
| 中文关键词: 农田 团聚体 镉 分配 污染 |
| 英文关键词: agricultural soil aggregate cadmium distribution pollution |
| 基金项目:江南大学自主科研计划青年基金(JUSRP11525) |
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| 摘要点击次数: 2534 |
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| 中文摘要: |
| 采集冶炼厂周边农田表层土壤样品,通过湿筛法获得不同尺寸水稳性团聚体,测定原土与团聚体层级不同化学形态镉(Cd)含量及理化性质,分析影响不同化学形态Cd在团聚体层级分布的主要因素。结果发现:土壤总Cd含量3.77 mg·kg-1,以惰性的残渣态Cd为主,其次是潜在可利用结合态Cd;不同化学形态Cd在粉砂+粘粒组分中最易富集,而在微团聚体中不易积累;考虑团聚体质量分配,总Cd和各化学形态Cd主要存在库是2000~250 μm大团聚体和微团聚体;影响总Cd分布的主要因素是土壤有机碳,影响可交换态Cd和铁锰氧化物结合态Cd分布的主要因素是CEC.以上结果表明:Cd在粉砂+粘粒组分中富集以及存在于2000~250 μm大团聚体中的潜在可利用结合态Cd导致农田土壤Cd污染风险提高。显然,通过土壤物理组分分级和Cd的化学形态分级的途径有助于客观、全面地解析Cd的污染风险。 |
| 英文摘要: |
| Soil samples were collected from the surface layer of farmland around a smelter and divided into four different sizes of water-stable aggregates by wet-sieving. Cadmium(Cd) fractions and soil physicochemical properties of bulk soil and soil aggregates were measured. Correlation between Cd fractions and physicochemical properties were also analyzed. Content of total Cd in bulk soil was averagely 3.77 mg·kg-1. The main Cd fraction was residual fraction, followed by potentially available fractions. All Cd fractions were enriched in the silt and clay fractions, but little Cd was found in microaggregates. Considering the mass weight of aggregates, total Cd and various Cd fractions were mainly distributed in 2000~250 μm macroaggregates and microaggregates. The main factor affecting the distribution of total Cd was soil organic carbon, whereas the distribution of exchangeable Cd and Cd bound to iron and manganese oxides was primarily affected by CEC. These results suggest that the existence of potentially available Cd fractions in the 2000~250 μm macroaggregates would result in high pollution risk, and that combing physical fractionation of soil particles and chemical fractionation of Cd could provide better understanding of the nature of Cd pollution. |
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