| 旱作高产田产量波动性和土壤干燥化 |
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| 引用本文： | 李玉山. 旱作高产田产量波动性和土壤干燥化[J]. 土壤学报, 2001, 38(3): 353-356 |
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| 作者姓名： | 李玉山 |
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| 作者单位： | 中国科学院水利部水土保持研究所, |
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| 基金项目： | 国家自然科学基金(49890330)和国家科技攻关项目(96-004-05)的阶段性研究成果 |
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| 摘 要： | 根据旱地作物长期田间试验数据，论述了旱作农业生产中作物产量波动性是一个规律性现象，并用波动系数加以表述。研究结果表明旱作高产田与低产田相比，存在相似的产量波动性，区别是它在较高产量水平上波动，高产田作物耗水量较高，从而导致土壤相对干燥化。土壤干部是高产田产量产生波动性的直接原因，而低产田则因作物吸水能力低，土壤储水不能充分利用所致。
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| 关 键 词： | 旱地作物 产量波动性 干燥过程 高产田 土壤储水 水土保持 |
| 收稿时间： | 1999-11-30 |
| 修稿时间： | 1999-11-30 |
FLUCTUATION OF YIELD ON HIGH-YIELD FIELD AND DESICCATION OF THE SOIL ON DRYLAND |
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| Li Yu-shan. FLUCTUATION OF YIELD ON HIGH-YIELD FIELD AND DESICCATION OF THE SOIL ON DRYLAND[J]. Acta Pedologica Sinica, 2001, 38(3): 353-356 |
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| Authors: | Li Yu-shan |
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| Affiliation: | Institute of Soil and Water Conservation Chinese Acadmy of Sciences and Ministry of Water Resources, Yangling, Shaanxi 712100 |
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| Abstract: | Based on the data of a long term field experiment of dryland crops, this article points out that yield fluctuation, expressed in fluctuating coefficient, is a regular phenomenon in dryland farming.High-yield field has a similar fluctuation as compared with low-yield field but their mechanisms are different.Desiccation happened in the entire soil profile is a direct cause of the yield fluctuation for high-yield field, but low water absorbing capacity of the crop for low-yielding field. |
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| Keywords: | Desiccation Dryland crops High-yield field Yield fluctuation |
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