土壤砂砾覆盖对入渗和蒸发影响研究进展

砂砾覆盖能防止土壤表面受到雨滴侵蚀,切断土壤的毛细管作用,从而对土壤入渗和蒸发规律产生影响。介绍了国内外砂砾覆盖对入渗和蒸发规律影响的研究成果,现有研究结果表明,降雨入渗与砾石覆盖度之间既有正相关关系,又有负相关关系,入渗不仅与砂砾粒径有关,还与砂砾在土壤表面所处的位置有关;砂砾覆盖能够抑制蒸发,抑制效果与砂砾粒径大小、颜色和厚度等有关。另外,一些国外学者通过定量化模型描述了砂砾覆盖条件下入渗和蒸发规律,但这些定量化模型还是最基本的简化模型,主要偏重于理论说明,直接应用于实践还存在一些问题。

Progress in the Research on the Impact of Gravel Mulch on Infiltration and Evaporation

Gravel mulch could prevent soil from eroding by water,cut off soil capillary action,and it have an influence on infiltration and evaporation.This paper introduces research results in domestic and overseas.Research results showed that gravel mulch increase or decrease infiltration,and it depend on grain size and position of gravel in the top layer;gravel mulch could reduce evaporation,and it is mainly attributed to particle size,color and mulch thickness.Some foreign scholars described the mechanism of infiltration and evaporation under gravel mulch by quantitative model.Based on laboratory experiments under controlled conditions,it has difficulty for practical use.Thus,further research will be necessary for exact parameterization.