| 植被作用下的土壤干化及其发生机制探讨 |
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| 引用本文： | 王青宁,王晗生,周景斌,吴高潮.植被作用下的土壤干化及其发生机制探讨[J].干旱地区农业研究,2004,22(4):163-167. |
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| 作者姓名： | 王青宁 王晗生 周景斌 吴高潮 |
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| 作者单位： | 1. 杨凌职业技术学院林学系,陕西,杨凌,712100
2. 中国科学院、水利部水土保持研究所,陕西,杨凌,712100;西北农林科技大学,陕西,杨凌,712100 |
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| 摘 要： | 通过分析黄土高原不同类型植被下的土壤水分状况,探讨了植被作用下土壤干化的特征和机制,以正确认识其实质,并提供可调控的依据。结果表明,植被作用下的土壤干化具有相对稳定性,其数量指标可采用田间稳定湿度值衡量。在黄土高原气候及地质条件下,土壤干化是植被作用下易于发生的现象,但它并不是植被建造的必然结果。人为营造大片耗水性强的植被类型,高密度以及追求高生产量,是其发生的关键因素。通过了解人工林草物种特点的二重性、合理配置群落结构的必要性以及人工与天然起源的植被在植物竞争效应方面的差异,可对其实施有效管理。植被下土壤干化的普遍发生,不应当妨碍黄土高原进一步开展林草植被建设。
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| 关 键 词： | 植被建设 土壤干化 影响因素 黄土高原 |
| 文章编号： | 1000-7601(2004)04-0163-05 |
| 修稿时间： | 2004年4月22日 |
Approach to soil desiccation by vegetation and mechanism of its genesis |
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| WANG Qing-ning,WANG Han-sheng.Approach to soil desiccation by vegetation and mechanism of its genesis[J].Agricultural Research in the Arid Areas,2004,22(4):163-167. |
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| Authors: | WANG Qing-ning WANG Han-sheng |
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| Institution: | WANG Qing-ning~1,WANG Han-sheng~ |
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| Abstract: | By analysing soil water regimes for kinds of vegetation, this paper broadly discusses the characteristics of soil desiccation by vegetation and mechanism of its genesis so as to properly understand what it is and provide bases for conditioning it. It is indicated that soil desiccation by vegetation is characterized by relative stability, and field steady moisture might be taken as a quantitative index to measure it. Under droughty climatic conditions characterized by less rain and strong evaporation,soil desiccation by vegetation is liable to occur because of deep groundwater level in the Loess Plateau, but it isn't inevitable for vegetation construction in the Loess Plateau. Constructing large-area vegetation with striking water consumption, high community density and pursuing high community productivity is crucial to its genesis. Soil desiccation might be conditioned by understanding the duality of the specialites of species composing artificial vegetation, necessity for reasonably disposing community structure, and difference in individual competition between artificial communities and natural communites. So soil desiccation occurance generally by vegetation should not be taken as a reason to doubt or even negate forest and grass vegetation construction in the Loess Plateau. |
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| Keywords: | vegetation construction soil desiccation influence factors Loess Plateau |
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