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首页> 外文期刊>Catena: An Interdisciplinary Journal of Soil Science Hydrology-Geomorphology Focusing on Geoecology and Landscape Evolution >Soil surface evaporation processes under mulches of different sized gravel.
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Soil surface evaporation processes under mulches of different sized gravel.

机译：不同粒径砾石覆盖下的土壤表面蒸发过程。

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摘要

To reduce water loss from soil surface evaporation is important in agricultural and environmental practices, especially in arid and semi-arid regions. Gravel mulch has long been practiced to reduce soil surface evaporation. In this study, a series of simulation experiments were conducted to study the effects of gravel mulches of different sizes on evaporation process from soil surface. Four mulch treatment levels were used: diameter 0.5 cm (A), diameter 2.5 cm (B), diameter 4.5 cm (C), and bare soil (CK), with three replicates. It was found that the gravel mulches dramatically reduced the evaporation from bare soil surface, particularly when soil water contents were at high levels. Under the same soil water content, the evaporation reduction rates under gravel mulches were negatively correlated with gravel sizes. The evaporation processes under gravel mulches were much more stable as compared with that from bare soil surface. The ratio of the soil surface evaporation to the atmospheric evaporation (Ess/Esa) and soil water contents with no mulch decreased rapidly with time. Soil water contents decreased slowly with time under mulches while the Ess/Esa values maintained at the more or less stable levels. During the successive evaporation process of 41 days, the cumulative soil surface evaporation under mulches was linearly correlated with time but that from bare soil surface was logarithmically correlated with time.
机译：在农业和环境实践中，尤其是在干旱和半干旱地区，减少土壤表层蒸发引起的水分流失非常重要。长期使用砾石覆盖物可减少土壤表面蒸发。在这项研究中，进行了一系列模拟实验，以研究不同大小的碎石覆盖物对土壤表面蒸发过程的影响。使用四种覆盖处理水平：直径0.5厘米（A），直径2.5厘米（B），直径4.5厘米（C）和裸土（CK），一式三份。发现砾石覆盖物显着减少了裸露土壤表面的蒸发，特别是当土壤含水量高时。在相同的土壤含水量下，砾石覆盖物下的蒸发减少率与砾石尺寸呈负相关。与来自裸露土壤表面的蒸发过程相比，砾石覆盖下的蒸发过程要稳定得多。土壤表面蒸发量与大气蒸发量的比率（ E ss / E sa ）和土壤含水量随着时间的推移，无覆盖物迅速减少。覆盖下土壤水分随时间缓慢下降，而 E ss / E sa 值保持在不太稳定的水平。在连续的41天蒸发过程中，覆盖下的累积土壤表面蒸发量与时间呈线性关系，而裸露土壤表面的累积蒸发量与时间呈对数关系。

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