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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 >Organic matter and wetting capacity distribution in aggregates of Chilean soils.
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Organic matter and wetting capacity distribution in aggregates of Chilean soils.

机译：智利土壤团聚体中的有机质和湿润能力分布。

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摘要

The wetting capacity of Hapludands and Palehumults under grassland and forest in southern Chile was assessed by measuring contact angles of solid, water and air interfaces. Microaggregates obtained from natural aggregates of two sizes (4-6.3 and 10-12 mm) were spread onto microscope slides and drops of saturated aqueous KCl solution were placed on the surface of the aggregates. The wetting angles of the drops were measured with a microscope with a horizontal viewing direction and an ocular containing a goniometer. The wetting capacity was determined on layers peeled progressively from the walls of aggregates toward their centres, and the organic matter content of the different aggregate layers was determined. The water stability of the aggregates was measured by dry and wet sieving. Hapludands always showed greater hydrophobicity than Palehumults. The wetting resistance of the soil matrix samples was less than that of the single layers of aggregates. The wetting resistance of aggregates generally increased from the exterior to their centre. The increase was strongest in the topsoil under grassland. Smaller aggregates under both grassland and forest showed a greater hydrophobicity than larger ones. Organic matter content increased towards the aggregate interiors, especially in the fine aggregates. Aggregates with greater water repellence were more stable to dry and wet sieving, especially under forest. Therefore, intensive management decreases wetting resistance and makes the soil less stable..
机译：通过测量固体，水和空气界面的接触角，评估了智利南部草地和森林下Hapluands和Palehumults的润湿能力。将得自两种尺寸（4-6.3和10-12 mm）的天然骨料得到的微骨料铺展到显微镜载玻片上，并将饱和的KCl水溶液滴在骨料表面。用水平观察方向的显微镜和装有测角仪的目镜测量液滴的润湿角。确定从聚集体壁向其中心逐渐剥离的层上的润湿能力，并确定不同聚集体层的有机质含量。聚集体的水稳定性通过干筛和湿筛来测量。链烷烃总是显示出比Palehumults更大的疏水性。土壤基质样品的抗湿性小于单层骨料的抗湿性。骨料的抗湿性通常从外部到其中心增加。增长最强的是草地下的表层土壤。草地和森林下较小的聚集体比较大的聚集体显示出更大的疏水性。有机质含量向骨料内部增加，尤其是细骨料。具有疏水性的骨料对干筛和湿筛更稳定，尤其是在森林下。因此，集约化管理会降低抗湿性，并使土壤不稳定。

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