| 新型保墒材料对黄绵土水分运移的作用机制研究 |
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| 引用本文： | 王进鑫.新型保墒材料对黄绵土水分运移的作用机制研究[J].西北林学院学报,2000,15(1):20-26. |
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| 作者姓名： | 王进鑫 |
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| 作者单位： | 西北农林科技大学,环境学院,陕西,杨陵,712100 |
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| 基金项目： | 国家“九五”重点科技攻关项目!(96-007-01-01-02) |
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| 摘 要： | 通过人工控水、自然蒸发试验,对高分子吸水剂和渗水膜两种保墒材料的抗旱作用机制进行了研究.结果表明,吸水剂与渗水膜在抑制土壤蒸发方面具有较强的互补性.吸水剂对土壤水分状况和蒸发性能的影响在于其对土壤水分物理性质的改善,并与用量和干旱过程密切相关.混剂土土壤容重略有增大,但最大持水量、总孔隙度并未减小,反而增大,同时,最小持水量、非毛管孔隙度及通气孔隙度均随吸土比增加而增大.混剂土对水分蒸发的抑制作用在含水量较高的干湿交替阶段远大于初始含水量较低的持续干旱阶段,且与用量成正相关.渗水膜覆盖对水分蒸发的抑制作用
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| 关 键 词： | 保墒材料 干旱过程 黄绵土 土壤水分运移 土壤蒸发 |
Regulatory Mechanism of New-type Material for Preserving Soil Moisture on Unsaturated Soil Water Movement and Evaporation of Loessal Soil |
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| Wang Jinxin.Regulatory Mechanism of New-type Material for Preserving Soil Moisture on Unsaturated Soil Water Movement and Evaporation of Loessal Soil[J].Journal of Northwest Forestry University,2000,15(1):20-26. |
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| Authors: | Wang Jinxin |
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| Abstract: | Based on natural evaporation experimentation of artificial control precipitation, two kinds of new type materials for preserving soil moisture, high molecular water absorbent (HMWA) and water permeable plastic film (WPPF) are studied. The result shows that both materials have highly seasonal complementarity for preserving soil water in semiarid area with the characteristic of continuous drought and intermittent wetting and drying.HMWA regulates soil moisture and evaporation by improving soil physical property and porosity. Alhough the unit dry weight of mixed soil is slightly increased, its maximum field capacity and total porosity is not decreased but highly increased. Besides, the field capacity, non capillary porosity and aeration porosity is also increased along with the increase of amount of HMWA.The evaporation inhibiton of the mixed soil is higher in the period of intermittent wetting and drying than that of continuous drought. However, the evaporation inhibition of the WPPF mulch is higher in the period of continuous drought. The higher cover rate of the WPPF, the lower evaporation rate. WPPF mulch not only decreases upward movement of water in both covered and adjacent bare soil mass, but also increase horizontal movement of water from the covered soil mass to the bare soil mass, which apparently enhance soil moisture by 19.62% ~20.02% in adjacent bare soil mass and 43.17%~49.04% in covered soil mass compared with check test after a month time continuous drought. |
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| Keywords: | material of preserving soil moisture arid process unsaturated soil water movement soil water evaporation Loessal soil |
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