| 直播水稻田田面水氮素动态变化及径流损失研究 |
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| 引用本文： | 顾佳,李勇,杨林章,朱亮,程文.直播水稻田田面水氮素动态变化及径流损失研究[J].安徽农业科学,2009,37(8). |
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| 作者姓名： | 顾佳 李勇 杨林章 朱亮 程文 |
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| 作者单位： | 1. 河海大学环境科学与工程学院,江苏南京,210098
2. 中国科学院南京土壤研究所,江苏南京,210008 |
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| 基金项目： | 国家自然科学基金，江苏省青蓝工程() |
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| 摘 要： | 目的]为直播水稻田的合理施用氮肥和灌水及防止氮素污染地表水提供科学依据.方法]通过田间试验,对太湖流域丹阳地区直播水稻田田面水氮素动态变化特征及径流损失进行研究.结果]施肥使田面水氮素浓度迅速提高,施氮后第1天田面水TN和NH+4-N的浓度达峰值43.99和23.31 mg/L,第7天分别下降至峰值的23.50%～30.02%和16.22%～23.84%;田面水的NO-3-N浓度在施氮后第3天达最大值7.51 mg/L,随后逐渐下降.施氮后3～5 d内,田面水NH+4-N/TN比值达动态观察期中的最大值0.50～0.69,此后逐渐降低.田面水NO-3-N/TN比值也先升后降,均在0.31以下.丹阳当季直播稻田TN地表径流损失量为23.84 kg/hm2,占施氮量的5.05%;NH+4-N流失量为13.24 kg/hm2,占施氮量的2.88%.烤田排水TN径流损失为13.49 kg/hm2,占总施氮量的2.93%.结论]NH+4-N是稻田田面水氮素的主要形态,施氮后7 d是防止稻田氮素流失的关键时期.
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| 关 键 词： | 直播水稻 氮素 动态变化 径流流失 |
Research on the Dynamic Change and Runoff Loss of Nitrogen in the Soil Surface Water of Rice Fields of Direct Seeding Cultivation |
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| GU Jia et al.Research on the Dynamic Change and Runoff Loss of Nitrogen in the Soil Surface Water of Rice Fields of Direct Seeding Cultivation[J].Journal of Anhui Agricultural Sciences,2009,37(8). |
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| Authors: | GU Jia |
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| Institution: | GU Jia et al(College of Environment Science , Engineering,Hohai University,Nanjing,Jiangsu 210098) |
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| Abstract: | Objective] The purpose was to provide scientific basis for fertilizing nitrogen(N) fertilizer reasonably in the rice fields of direct seeding cultivation and protecting surface water from N pollution.Method] The dynamic change characters and runoff loss of N in the soil surface water of rice fields of direct seeding cultivation in Danyang area of Tai Lake basin were researched through field experiment.Result] Fertilization rapidly enhanced the concn.of N in soil surface water.On the 1st day since fertili... |
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| Keywords: | Direct-seeding rice Nitrogen Dynamic change Runoff loss |
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