| 绿洲连作棉田土壤重金属富集特征及评价 |
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| 引用本文： | 邓 红,林海荣,张 泽,吕 新,石宏刚.绿洲连作棉田土壤重金属富集特征及评价[J].西北农业学报,2014,23(8):92-98. |
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| 作者姓名： | 邓 红 林海荣 张 泽 吕 新 石宏刚 |
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| 作者单位： | (石河子大学/新疆生产建设兵团绿洲生态农业重点实验室，新疆石河子 832003) |
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| 基金项目： | 国家高技术研究发展计划(2012AA101902)；国家科技支撑计划课题(2012BAD41B02)。 |
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| 摘 要： | 对新疆绿洲区不同连作年限棉田土壤中重金属元素As、Cd、Cr、Cu、Hg、Ni、Pb、Zn富集特征进行研究,并根据地质累计指数法对污染程度进行分级。结果表明,随连作年限延长,元素As、Cd、Zn含量总体呈上升趋势,而元素Hg、Cu、Pb、Cr含量总体呈下降趋势,元素Ni的全量整体变化不大;As逐年累积达轻度-中等污染,元素Cd累积达中等-强污染,元素Hg在土壤中含量水平已达到强-极强污染程度。棉田土壤中As、Cd与全磷含量达极显著相关性,表明长年连作条件下,磷肥的施用影响重金属元素的富集程度,因此棉田的耕作制度及施肥量应作适当调整,避免加重重金属污染。
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| 关 键 词： | 绿洲棉田 重金属 磷肥 富集特征 评价 |
Evaluation on Enrichment Characteristics of Heavy Metal in the Oasis Cropping Cotton Filed |
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| Abstract: | Enrichment features of full amount soil heavy metals As, Cd, Cr, Cu, Hg, Ni, Pb, Zn in the different cropping cotton field were studied, and the pollution degree was evaluated based on the Geo-accumulation Index. The results showed that with the extension of continuous cropping, the full amount of elements As, Cd, Zn generally presented upward trend; the full amount of elements Hg, Cu, Pb, Cr generally presented downward trend; the full amount of element Ni changed slightly;the pollution of element As gradually accumulated to mild - moderate pollution degree; Cd accumulated to moderate-strong pollution degree; Hg in the soil has reached strong and extremely strong level. The total phosphorus in the cotton soil was highly and significantly correlated with As, Cd, which indicated that under the continuous cropping condition, application of phosphorus could influence the enrichment of heavy metals. So, cotton farming systems and fertilization amount should be adjusted to a suitable level to avoid further heavy metal pollution. |
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| Keywords: | Oasis Cotton Heavy metal Phosphate fertilizer Enrichment characteristics Evaluation |
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