| 陈 涛,常庆瑞,刘 京.长期污灌农田土壤Cd赋存形态及其有效性的空间变异研究[J].农业环境科学学报,2014,33(7):1322-1327. |
| 长期污灌农田土壤Cd赋存形态及其有效性的空间变异研究 |
| Fractions and Bioavailability Spatial Distribution of Soil Cd Under Long-term Sewage Irrigation |
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| DOI：10.11654/jaes.2014.07.010 |
| 中文关键词: 污灌 土壤镉 化学形态 空间分布 |
| 英文关键词: wastewater irrigation soil Cd chemical fraction spatial distribution |
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| 中文摘要: |
| 以典型污灌区农田土壤为研究对象，分析污灌对农田土壤重金属Cd赋存形态的影响，并揭示其生物有效性空间分布特征。研究结果表明：经长期污灌，研究区土壤Cd主要以可交换离子态和碳酸盐结合态为主，两者占全量比平均为73%；各形态平均含量随污灌时间增长而增加，且其形态分配趋于向活性更强的可交换态、碳酸盐结合态转化；由于污灌历史不同，可交换离子态、碳酸盐结合态及铁锰氧化物结合态呈极显著差异。土壤生物有效态Cd和潜在有效态Cd与不可利用态Cd相比，所受外界影响因素多，具有更弱的空间结构性，其空间分布呈东高西低趋势，因而在未来农业结构调整及制定修复方案时，应予高度重视。 |
| 英文摘要: |
| Long-term sewage irrigation would influence fractions and bioavailability of heavy metals in soils. Here Cd fractions and bioavailability spatial distribution were studied in farmland in Fenghui irrigated area of Xi′an City under long term sewage irrigation. Soil Cd existed mainly in exchangeable and carbonate fractions, accounting for 73% of total content. With increasing sewage irrigation time, soil Cd tended to transform to exchangeable and carbonate fractions. Irrigation history significantly affected exchangeable, carbonate and Fe-Mn oxides fractions. Soil bioavailable Cd and potentially available Cd contents had weaker spatial structure than unavailable Cd, implying that bioavailable Cd was more influenced by external factors. Soil Cd bioavailability reduced from the east to the west of the irrigated area. These findings would be very useful for adjusting agricultural structures and planning environmental remediation in the future. |
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