| 养猪场处理尾水灌溉对太湖地区水稻土硝酸根异化还原为铵的影响 |
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| 引用本文： | 卢伟伟,施卫明.养猪场处理尾水灌溉对太湖地区水稻土硝酸根异化还原为铵的影响[J].土壤学报,2012,49(6):1120-1127. |
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| 作者姓名： | 卢伟伟 施卫明 |
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| 作者单位： | 中国科学院南京土壤研究所,中国科学院南京土壤研究所 |
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| 基金项目： | 国家自然科学基金项目（面上项目，重点项目，重大项目） |
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| 摘 要： | 以太湖地区的湖白土和乌栅土为研究对象，通过室内15N 示踪实验研究了低浓度废水灌溉对土壤异化硝酸根还原为铵（DNRA）的影响。乌栅土DNRA速率和相对潜势分别为0.68 ~ 0.79 mg N kg-1干土 天-1和34.61 ~ 44.45%；湖白土DNRA速率和相对潜势分别为1.14 ~ 1.41 mg N kg-1干土 天-1和54.24 ~ 106.70%。低浓度废水对2种土壤的DNRA速率均影响不大；低浓度废水对湖白土DNRA相对潜势影响不大而明显降低了乌栅土DNRA相对潜势。相关分析表明，土壤DNRA相对潜势与培养开始（r = 0.836，p < 0.05，n = 6）和结束（r = 0.936，p < 0.01，n = 6）时的土壤溶解有机碳 / 硝态氮（DOC / NO3-N）均显著正相关，而与培养始末土壤Eh和DOC含量的相关性不显著。以上研究结果表明，太湖地区乌栅土具有较高的DNRA潜势，实践上有可能通过调控DNRA过程实现保持土壤氮素而减少农田氮损失的目的；尾水灌溉主要通过改变土壤DOC / NO3-N而影响DNRA对NO3-异化还原的贡献且其影响因土壤类型而异。
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| 关 键 词： | 污灌 硝酸根异化还原为铵 湖白土 乌栅土 DOC / NO3-N Eh |
| 收稿时间： | 2011/11/24 0:00:00 |
| 修稿时间： | 1/13/2012 5:28:14 PM |
Potential of dissimilatory nitrate reduction to ammonium in paddy soils in the Taihu lake region as affected by irrigation with tail water from pig rearing |
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| Lu Weiwei and Shi Weiming.Potential of dissimilatory nitrate reduction to ammonium in paddy soils in the Taihu lake region as affected by irrigation with tail water from pig rearing[J].Acta Pedologica Sinica,2012,49(6):1120-1127. |
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| Authors: | Lu Weiwei and Shi Weiming |
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| Affiliation: | Institute of Soil Science, Chinese Academy of Sciences,Institute of Soil Science, Chinese Academy of Sciences |
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| Abstract: | Using the 15-nitrogen (15N) tracing method, potential of dissimilatory nitrate reduction to ammonium (DNRA) in Hubai and Wushan soils of the Taihu Lake region as affected by tail water from pig rearing was studied. DNRA rates and relative potentials varied in the range of 0.68 ~ 0.79 mg N kg-1 dry soil d-1 and 34.61% ~ 44.45%, respectively, in Hubai soil, and in the range of 1.14 ~ 1.41 mg N kg-1 dry soil d-1 and 54.24% ~ 106.70%, respectively in Wushan soil. Irrigation with tail water from pig rearing had little effect on DNRA rates in both soils and DNRA relative potential in Hubai soil, while it obviously reduced DNRA relative potential in Wushan soil. Correlation analysis indicates that soil DNRA relative potential was significantly positively correlated with the ratio of soil dissolved organic carbon to nitrate nitrogen (DOC / NO3--N) at the start (r = 0.836, p < 0.05, n = 6) and the end (r = 0.936, p < 0.01, n = 6) of the incubation, but not significantly correlated with soil Eh or DOC at the start and the end of the incubation. The results indicate that Wushan soil is of much higher DRNA potential, therefore, in practice, it might be possible to enhance N retention through regulation of DNRA and hence to minimize N loss from paddy fields; and irrigation of the soils with tail water affects the contribution of DNRA to dissimilatory NO3- reduction mainly by changing soil DOC / NO3--N and its effect varies with the soil types. |
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| Keywords: | Waste water irrigation Dissimilatory nitrate reduction to ammonium Hubai soil Wushan soil DOC / NO3-N Eh |
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