中国农业气象

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湖南双季稻田不同氮磷施用量的径流损失

石丽红;纪雄辉;李洪顺;田发祥;彭华;刘昭兵;   

  1. 湖南省土壤肥料研究所;湖南省农业环境研究中心;
  • 出版日期:2010-08-10 发布日期:2010-08-10
  • 基金资助:
    农业部种植业源流失系数重点监测项目(WX-Z-07-15);; 国家支撑计划课题(2007BAD87B11;2007BAD89B11)

Nitrogen and Phosphorus Losses from Surface Runoff under Different Application in the Double Cropping Rice Fields in Hunan

SHI Li-hong1,2,JI Xiong-hui1,2,LI Hong-shun1,TIAN Fa-xiang1,2,PENG Hua1,2,LIU Zhao-bing1,2(1.Soil and Fertilizer Institute of Hunan Province,Changsha 410125,China;2.Research Center of Agro-Environment of Hunan Province,Changsha 410125)   

  • Online:2010-08-10 Published:2010-08-10

摘要: 研究双季稻田不同施肥量处理的氮磷降雨径流损失规律,对于指导双季稻合理施肥、保护水环境具有重要的现实意义。本研究采用田间试验结合径流小区监测方法,对湖南双季稻田不同氮、磷施用量的径流损失进行了研究。结果表明,单次径流事件中径流水的氮、磷含量随施肥量的增加而增大;基肥和追肥后10d内发生的3次径流事件中径流水的氮磷含量较高,其中总氮含量最高达10.880mg.L-1,总磷含量最高为0.202mg.L-1;铵态氮和硝态氮是稻田总氮径流损失的主要形态,水稻生长前期以铵态氮为主,后期则以硝态氮为主;可溶性磷占总磷比例为11.0%~94.0%;整个双季稻期间不同施肥量处理的总氮流失量为3.710~7.290kg.hm-2,流失系数为1.870%~3.771%,总磷流失量为0.200~0.320kg.hm-2,流失系数为0.327%~0.966%;氮、磷流失量与其施用量存在极显著的线性正相关,相关系数分别为0.978和0.997。氮、磷流失系数随氮、磷施用量增加而下降。适当减少双季稻田氮磷施用量能有效控制稻田的氮磷径流损失量,减小对地表水质的威胁。

关键词: 湖南, 氮、磷, 双季稻田, 径流损失

Abstract: It was significant to study the nitrogen and phosphorus losses from surface runoff in double cropping rice filed for guiding the rational fertilizer and protecting water environment.The surface runoff losses under different nitrogen and phosphorus application in double cropping rice field in Hunan was studied based on field experiment data combining with runoff plot.The results showed that both nitrogen and phosphorus concentrations increased with application increasing in single runoff.Ammonium nitrogen and saltpetre nitrogen were the predominant forms of nitrogen surface runoff.Ammonium nitrogen was dominant in prophase of double rice growth season and saltpetre nitrogen in anaphase.The ratios of dissoluble phosphorus to total phosphorus of runoff water were 11.0%~94.0%.Nitrogen and phosphorus losses from surface runoff under their different application were 3.710~7.290kg·ha-1 and 0.200~0.320kg·ha-1,and erosion coefficients were 1.870%~3.771% and 0.327%~0.966%.There was good linear correlation between nitrogen and phosphorus losses from surface runoff and their application.Their coefficients were 0.978 and 0.997.Reducing nitrogen and phosphorus application in double cropping rice filed appropriately could decrease the losses from surface runoff and mitigate damage to surface water quality.

Key words: Hunan, Hunan, Nitrogen and phosphorus, Double cropping rice field, Loss from surface runoff