SPECIFIC EFFECT OF MAGNESIUM ON SOIL-EROSION AND WATER INFILTRATION
SPECIFIC EFFECT OF MAGNESIUM ON SOIL-EROSION AND WATER INFILTRATION
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DOI：
10.2136/sssaj1991.03615995005500030025x
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发表时间：
1991-05-01
影响因子：
2.9
通讯作者：
KEREN, R
中科院分区：
文献类型：
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作者：
KEREN, R
本研究旨在探讨吸附态镁对降雨土壤侵蚀的影响。 研究了吸附态Mg和Ca对两种土壤（钙性单旱土和典型赤旱土）降雨侵蚀和入渗速率（IR）的影响。 滴式降雨模拟器和去离子水，水滴动能为12.5 kJ m-3。 土壤侵蚀速率镁土大于钙土。 稳态IR和达到稳态IR所需的累积水深均低于镁土壤比钙土壤。 吸附镁的蒙脱石土壤增加侵蚀和降低IR，无论CaCO 3含量。 Ca聚集体比Mg聚集体更稳定，即使在Na的存在下。 镁对土壤侵蚀的具体影响被解释为这些离子的存在下的粘土tactoids的外表面上，和更广泛的水合壳的镁离子，而不是钙离子。 有人认为，稳态的渗透和土壤侵蚀速率是两个过程的结果，发生在相反的方向：密封形成和土壤剥离。
This study was conducted to determine the effects of adsorbed Mg on erosion of soils exposed to rain. The effects of adsorbed Mg and Ca on soil erosion and infiltration rate (IR) of two soils (a Calcic Haploxeralf and a Typic Rhodoxeralf) exposed to rainfall, in the absence and presence of adsorbed Na, was studied. A drip-type rainfall simulator and deionized water were used at water-drop kinetic energy of 12.5 kJ m-3. The erosion rate of the soils was higher for the Mg-soils than for the Ca-soils. Both the steady-state IR and the cumulative water depth required to reach a steady-state IR were lower for Mg soils than for Ca soils. Adsorbed Mg by the montmorillonitic soil increased erosion and lowered IR, regardless of CaCO3 content. The Ca aggregates were more stable than Mg aggregates, even in the presence of Na. The specific effect of Mg on soil erosion was explained by the presence of these ions on the external surfaces of the clay tactoids, and the wider hydration shell of the Mg ion, as opposed to that of the Ca ion. It was suggested that the steady-state infiltration and soil erosion rates are the result of two processes that occur in opposite directions: seal formation and soil detachment.