| 侵蚀条件下黄绵土氮素流失规律的研究 |
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| 引用本文： | 王继增,彭琳,余存祖.侵蚀条件下黄绵土氮素流失规律的研究[J].水土保持研究,1990,0(2):95-103. |
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| 作者姓名： | 王继增 彭琳 余存祖 |
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| 作者单位： | 中国科学院、水利部西北水土保持研究所 陕西杨陵 |
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| 摘 要： | 在黄土丘陵区坡耕地黄绵土上进行径流小区试验，研究侵蚀条件下土壤氮素流失规律，并采用硝化力培养方法研究黄绵土的供氮能力。研究结果表明，侵蚀土壤供氮能力远低于非侵蚀土壤，施肥处理的径流氮浓度显著提高，从而加大了氮流失，泥沙氮富集率为1.05～1.58.土壤氮流失主要由土壤冲刷所引起，在一年内，土壤氮的流失主要发生在几场暴雨中。种植中耕作物加剧了土壤氮的流失。建议:采取施肥耕作措施以提高黄绵土的供氮能力，加强土壤保持工作，防止土壤冲刷引起的土壤氮素流失，特别是防止几场降雨强度大的暴雨引起土壤氮的大量流失。种植中耕作物一定要采用水土保持耕作法。
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| 关 键 词： | 土壤侵蚀 黄绵土 氮素流失 |
Nitrogen Loss of Cultivated Loessial Soil Under Erosion Condition |
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| Wang Jizeng,Peng Lin,Yu Cunzu.Nitrogen Loss of Cultivated Loessial Soil Under Erosion Condition[J].Research of Soil and Water Conservation,1990,0(2):95-103. |
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| Authors: | Wang Jizeng Peng Lin Yu Cunzu |
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| Institution: | Northwestern Institute of Soil and Water Conservation Under Academia Sinica and Ministry of Water Conservancy |
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| Abstract: | The runoff plot experiment and nitrification experiment was made to study nitrogen loss and sapplying capacity on slopping farmland in loess hilly region. Nitrogen sapplying capacity of cultivated loessial soil with serious erosion is lower than the non-erosion soil. For applying fertilizer plot, the runoff amounts are increased so that the nitrogen loss increased and nitrogen "richness ratio" in silt is 1.05-1.58. Nitrogen loss is affribated mainly soil erode during in a few number of time rainstorm erosion. Nitrogen loss may be increased by planting intertilled crop and decreased by planting grass. The paper pointed out that powerful measure must be adopted to improve the nitrogen suppling capacity and provent soil erode. |
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| Keywords: | Soil erosion Cultivated loessial soil Nitrogen loss |
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