| 长期种植苜蓿对土壤氮素营养的作用 |
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| 引用本文： | 刘晓宏,郝明德.长期种植苜蓿对土壤氮素营养的作用[J].中国生态农业学报,2001,9(1):82-84. |
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| 作者姓名： | 刘晓宏 郝明德 |
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| 作者单位： | 中国科学院寒区旱区环境与工程研究所 兰州 730000;中国科学院寒区旱区环境与工程研究所 兰州 730000 |
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| 基金项目： | 国家自然科学基金重大项目(49890330)资助 |
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| 摘 要： | 13年长期施肥和轮作试验结果表明，连续种植苜蓿时N肥、P肥、有机肥的配合施用(NPM)较单施P肥对提高土壤硝态氮(NO-3-N)含量水平有较好效果；而无论施肥与否，种植苜蓿对土壤深层NO-3-N均造成不同程度的亏缺。苜蓿(NPM)连作较小麦(NPM)连作土壤NO-3-N利用率高；种植苜蓿对土壤铵态氮(NH+4-N)分布影响与NO-3-N不同，深层土壤CK、NPM配施处理NH+4-N含量明显高于施P和裸地处理，不同作物种植系统中以苜蓿连作土壤剖面中NH+4-N含量最高。与其他轮作相比，苜蓿连作在提高土壤剖面供N能力方面有较好作用。
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| 关 键 词： | 长期施肥 苜蓿 硝态氮 铵态氮 矿化势 |
| 收稿时间： | 1999/12/21 0:00:00 |
| 修稿时间： | 3/6/2000 12:00:00 AM |
Effects of long term plant Medicago sativa Linn. on soil nitrogen nutrient |
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| LIU Xiao-Hong and HAO Ming-De.Effects of long term plant Medicago sativa Linn. on soil nitrogen nutrient[J].Chinese Journal of Eco-Agriculture,2001,9(1):82-84. |
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| Authors: | LIU Xiao-Hong and HAO Ming-De |
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| Institution: | Cold and Arid Regions Environment and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000;Cold and Arid Regions Environment and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000 |
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| Abstract: | The results of 13 years long-term fertilization and rotation test show that the application of nitrogenous fertilizer, phosphorate fertilizer and organic fertilizer in combination(NPM) can enhance the content of nitrate-N more effectively than that of application of only phosphorate fertilizer. There is a deficiency of nitrate-N in deeper soil layer after a longer time of planting Medicago sativa Linn. and a higher utilization ratio of nitrate-N of planting Medicago sativa Linn. than that of winter wheat. Among all treatments, the ammonium-N of planted Medigao sativa Linn. is the highest than that of other crops, and also the ammounum of CK and NPM are higher than that of P and the bareness disposal. Compared to other rotation systems, Medicago sative Linn. has better effect than others on improving the level of organic-N mineral potential. |
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