天然降雨条件下水稻田氮磷径流流失特征研究 Study on Characteristic of Nitrogen and Phosphorus Loss fr

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天然降雨条件下水稻田氮磷径流流失特征研究

Study on Characteristic of Nitrogen and Phosphorus Loss from Rice Field by Natural Rainfall Runoff

采用具有单排单灌的试验小区,对水稻田在多次天然降雨条件下形成的径流中氮磷的流失特征进行了研究.结果表明,几次降雨径流的累积量中总氮的最高浓度达到22.15 mg/L,总磷的浓度达4.84 mg/L,可溶态氮是天然降雨径流流失氮素的主要形态,约占总氮的70%~92%,尤其是硝态氮,约占总氮的40%~80%,而径流流失中氨态氮的浓度较小,仅占总氮浓度的3.4%~27%,颗粒态磷在径流流失磷素中占到较大的比重,可达76%~79%;几次降雨事件中总氮的累积流失负荷约在0.23~0.80 kg/hm2,总磷的累积流失负荷约在0.07~0.15 kg/hm2,两者都小于当季施肥量的1%;降雨和施肥是影响氮磷素径流输出的主要因子,对降雨、施肥量、氮磷素输出负荷运用二元一次方程进行拟合,结果表明相关性达到了显著性水平.水利论文"X&g CC&`1~

作 者: 梁新强 田光明 李华 陈英旭 朱松 LIANG Xin-qiang TIAN Guang-ming LI Hua CHEN Ying-xu ZHU Song  
作者单位:浙江大学,环境工程系,杭州,310029 
刊 名:水土保持学报  ISTIC PKU
英文刊名:JOURNAL OF SOIL AND WATER CONSERVATION 
年,卷(期):2005 19(1) 
分类号:S157.1 S158.3 
关键词:氮、磷   天然降雨   径流   流失负荷  
机标关键词:降雨条件水稻田氮磷径流流失特征研究Rice Field总氮天然降雨最高浓度流失负荷降雨径流施肥量磷素次降雨显著性水平总磷输出试验小区流失特征磷的累积 
基金项目:国家重点基础研究发展计划(973计划) 
下一篇:两种土壤不同施氮水平对稻田系统的氮素利用及环境效应影响 Effect of Different Nitrogen Application Levels on
上一篇:重庆市土壤有机碳库的估算及其空间分布特征 Estimating Soil Organic Carbon pool of Chongqing Area and
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