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首页> 外文期刊>土壤圈（英文版） >Nitrogen Runoff and Leaching Losses During Rice-Wheat Rotations in Taihu Lake Region, China
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Nitrogen Runoff and Leaching Losses During Rice-Wheat Rotations in Taihu Lake Region, China

机译：太湖地区稻麦轮作过程中氮的流失与淋失

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摘要

Although nitrogen (N) loss through runoff and leaching from croplands is suspected to contribute to the deterioration of surrounding water systems, there is no conclusive evidence for paddy soils to prove this hypothesis. In this study, field plot experiments were conducted to investigate N losses through runoff and leaching for two consecutive years with 3 N fertilization rates in rice (Oryza sativa L.)-wheat (Triticum aestivum L.) rotations in the Taihu Lake region, China. A water collection system was designed to collect runoff and leachates for both the rice and wheat seasons. Results showed that dissolved N (DN), rather than particulate N (PN), was the main form of N loss by runoff. The NO-3-N concentration in runoff was between 0.1 and 43.7 mg L-1, whereas the NH+4-N concentration ranged from below detection limit to 8.5 mg L-1. Total N (TN) loads by runoff were 1.0-17.9 and 5.2-38.6 kg ha-1 during rice and wheat seasons, respectively, and the main loss occurred at the early growing stage of the crops. Nitrogen concentrations in leachates during the rice seasons were below 1.0 mg L-1 and independent of the N application rate, whereas those during the wheat season increased to 8.2 mg L-1 and were affected by the fertilizer rate. Annual losses of TN through runoff and leaching were 13.7-48.1 kg ha-1 from the rice-wheat cropping system, accounting for 5.6%-8.3% of the total applied N. It was concluded that reduction in the N fertilization rate, especially when the crop was small in biomass, could lower the N pollution potential for water systems.
机译：尽管怀疑从径流和农田中淋失造成的氮（N）损失会导致周围水系的恶化，但尚无确凿证据表明稻田土壤可以证明这一假设。在这项研究中，进行田间田间试验，以调查连续两年来，在中国太湖地区的水稻（Oryza sativa L。）-小麦（Triticum aestivum L.）轮作中，通过径流和淋洗连续三年以3 N的施氮量损失氮。 。设计了一个水收集系统，用于收集水稻和小麦季节的径流和渗滤液。结果表明，溶解态氮（DN）而不是颗粒态氮（PN）是径流氮流失的主要形式。径流中NO-3-N的浓度在0.1至43.7 mg L-1之间，而NH + 4-N的浓度在检测限以下至8.5 mg L-1之间。水稻和小麦季节，径流的总氮（TN）负荷分别为1.0-17.9和5.2-38.6 kg ha-1，主要损失发生在作物的早期生长阶段。水稻季节渗滤液中的氮浓度低于1.0 mg L-1，且与氮肥施用量无关，而小麦季节渗滤液中的氮浓度增至8.2 mg L-1，并受肥料用量的影响。稻麦系统因径流和淋失导致的TN年度损失为13.7-48.1 kg ha-1，占施氮总量的5.6％-8.3％。结论是氮肥的施用量减少，尤其是当作物的生物量很小，可能降低水系统的氮污染潜力。

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  • 来源
    《土壤圈（英文版）》 |2007年第4期|445-456|共12页
  • 作者

    TIAN Yu-Hua; YIN Bin; YANG Lin-Zhang; YIN Shi-Xue; ZHU Zhao-Liang;

  • 作者单位

    State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, 71 East Beijing Road, Nanjing 210008 China;

    Graduate College of the Chinese Academy of Sciences, Beijing 100049 China;

    State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, 71 East Beijing Road, Nanjing 210008 China;

    State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, 71 East Beijing Road, Nanjing 210008 China;

    College of Environmental Science and Engineering, Yangzhou University, Yangzhou 225009 China;

    State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, 71 East Beijing Road, Nanjing 210008 China;

  • 收录信息 中国科学引文数据库(CSCD);中国科技论文与引文数据库(CSTPCD);
  • 原文格式 PDF
  • 正文语种 chi
  • 中图分类 农业基础科学;
  • 关键词

    leaching; N fertilization rate; N loss; paddy soil; runoff;

    机译：淋溶;施氮量;氮素流失;水稻土;径流;
  • 入库时间 2022-08-19 04:04:15
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