| 不同程度重金属污染对水稻土团聚体组成的影响 |
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| 引用本文： | 张玉娇,陈敏瑶,张旭辉,贺 枫,刘晓雨,卞荣军,程 琨,李恋卿,潘根兴.不同程度重金属污染对水稻土团聚体组成的影响[J].土壤,2017,49(2):337-344. |
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| 作者姓名： | 张玉娇 陈敏瑶 张旭辉 贺 枫 刘晓雨 卞荣军 程 琨 李恋卿 潘根兴 |
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| 作者单位： | 南京农业大学农业资源与生态环境研究所,南京,210095 |
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| 基金项目： | (41471193)资助 |
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| 摘 要： | 以太湖地区长期受重金属污染的稻麦轮作条件下的水稻土为研究对象,分别采取水稻收获期和小麦收获期不同重金属污染水平的土壤和临近非污染土壤(对照土壤),利用低能量超声分散分离技术将原状土进行团聚体分级,并结合土壤碳库分析,研究不同程度重金属污染对水稻土团聚体组成的影响。结果表明:随着重金属污染程度的增加,小麦收获期土壤2~0.2 mm与0.2~0.02 mm粒级的团聚体含量呈显著降低趋势,0.02~0.002 mm与0.002 mm粒级团聚体含量显著增加,但这种趋势在水稻收获期表现不显著;重金属污染降低了水稻季团聚体平均重量直径(MWD),从而降低了土壤的团聚程度,但这在小麦季并未表现出显著的降低作用;而小麦季重金属污染对原土及团聚体中有机碳含量没有显著影响,水稻季重金属污染则显著增加了土壤有机碳的含量。这些结果表明不同重金属污染程度对土壤团聚体组成的影响在不同的作物收获期表现不同,这可能与土壤团聚体周转过程受农田水分管理等措施影响有关,尚需深入研究。
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| 关 键 词： | 重金属污染 稻麦轮作 水稻土 团聚体组成 有机碳 |
| 收稿时间： | 2016/4/20 0:00:00 |
| 修稿时间： | 2016/8/1 0:00:00 |
Effects of Different Heavy Metal Pollution Levels on Soil Aggregates Composition in A Paddy Soil |
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| ZHANG Yujiao,CHEN Minyao,ZHANG Xuhui,HE Feng,LIU Xiaoyu,BIAN Rongjun,CHENG Kun,LI Lianqing and PAN Genxing.Effects of Different Heavy Metal Pollution Levels on Soil Aggregates Composition in A Paddy Soil[J].Soils,2017,49(2):337-344. |
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| Authors: | ZHANG Yujiao CHEN Minyao ZHANG Xuhui HE Feng LIU Xiaoyu BIAN Rongjun CHENG Kun LI Lianqing and PAN Genxing |
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| Institution: | Institute of Resources,Ecosystem and Environment for Agriculture,Nanjing Agricultural University,Institute of Resources,Ecosystem and Environment for Agriculture,Nanjing Agricultural University,Institute of Resources,Ecosystem and Environment for Agriculture,Nanjing Agricultural University,Institute of Resources,Ecosystem and Environment for Agriculture,Nanjing Agricultural University,Institute of Resources,Ecosystem and Environment for Agriculture,Nanjing Agricultural University,Institute of Resources,Ecosystem and Environment for Agriculture,Nanjing Agricultural University,Institute of Resources,Ecosystem and Environment for Agriculture,Nanjing Agricultural University,Institute of Resources,Ecosystem and Environment for Agriculture,Nanjing Agricultural University,Institute of Resources,Ecosystem and Environment for Agriculture,Nanjing Agricultural University |
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| Abstract: | Paddy soils are facing a serious of heavy metal pollution problems. Under this environmental stress how the soil aggregation and soil organic carbon changing has been growing more attention. The aim of this study was to explore the influences of different heavy metals pollution levels on soil aggregates composition of a paddy soil. Soil samples were collected near Taihu lake area in Jiangsu with a rotation of wheat and rice under a long-term heavy metal contamination. Bulk soils were separated into various size fractions of aggregates with low energy dispersion. The results showed that in wheat season the contents of 2-0.2 mm and 0.2-0.02 mm aggregates decreased significantly, whereas the contents of 0.02-0.002 mm and <0.002 mm aggregates increased significantly with the increasing of pollution degree of heavy metals. But it was not happened in the rice growing season because of the different water regime management from that in the wheat growing season. All the data showed that heavy metal pollution decreased the MWD (Mean Weight Diameter) value of the aggregates, which implied that metal pollution could destroy the soil aggregation. But the heavy metal pollution had no significant influences on the content of the organic carbon in bulk soil and aggregates. The study showed that under heavy metal pollution, the composition of soil aggregates in the various growing crop season showed various responses which could be related the various field managements. |
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| Keywords: | heavy metals pollution rice-wheat rotation paddy soil aggregate composition organic carbon |
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