辽东山地冰缘地貌表层土壤粒度特征

发布时间：2018-07-01 07:59

本文选题：冰缘地貌 + 土壤　；参考：《中国水土保持科学》2016年01期

【摘要】：为探究辽东山区冰缘地貌表层土壤的质地特征及侵蚀强度,对48个典型冰缘地貌的土壤样品进行粒度测试分析,结果表明:研究区土壤级配良好,且径级跨度较大,质地以黏土质粉砂为主,粉砂其次,偶见砂质粉砂。土壤粒度整体较细(粒度参数平均粒径Mz的鐖值约6.45),分选差(标准偏差σI约1.89),以正偏居多(约占58%),峰态多为很窄峰(约占83%);粒度频率分布包括单峰(25%)、双峰(50%)和多峰(25%);结合萨胡判据和南北坡土壤粒度不对称等特征,初步推测早期土壤沉积组分来自近源浅表风化和远源风成沉降,其混合组分经冰缘流水搬运改造后形成土壤沉积。根据分维值(约2.28)、级配比例及敏感组分的提取可知,沉积水动力不强,地表植被覆盖越优良,对流水侵蚀能力的消耗和抑制则越显著。供试样品的粒度特征反映流水侵蚀强度不大,植被覆盖发挥了重要的水土保持功能。
[Abstract]:In order to investigate the texture characteristics and erosion intensity of the topsoil in the ice margin landform of eastern Liaoning, the soil samples of 48 typical glacial landforms were measured and analyzed. The results showed that the soil gradation in the study area was good and the diameter grade span was large. Texture is mainly clay silt, silt followed, occasionally sandy silt. The soil granularity is fine (the average particle size Mz is about 6.45), the sorting difference (standard deviation 蟽 I is about 1.89), the positive deviation is mostly (about 58%), the peak state is mostly very narrow peak (about 83%), and the particle size frequency distribution includes single peak (25%), double peak (50%) and many peaks. Peak (25%), combined with Sahu criterion and soil particle size asymmetry on the north and south slopes, It is preliminarily speculated that the early soil sediment components came from near-source superficial weathering and distant wind-induced sedimentation, and the mixed components formed soil deposits after being transported and modified by ice edge flowing water. According to the fractal dimension (about 2.28), gradation ratio and the extraction of sensitive components, it can be seen that the lower the sedimentary hydrodynamic force, the better the vegetation cover, the more significant the consumption and inhibition to the erosion ability of flowing water. The grain size characteristics of the samples showed that the erosion intensity of water was not large, and vegetation cover played an important role in soil and water conservation.
【作者单位】：辽宁师范大学城市与环境学院;辽宁老秃顶子国家级自然保护区管理局;
【基金】：国家自然科学基金“辽东山地老秃顶子冰缘地貌植物群落稳定性研究”(41271064)
【分类号】：S157

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