植被恢复对典型黑土表层土壤压缩性和承载能力的影响

发布时间：2018-01-09 04:16

本文关键词：植被恢复对典型黑土表层土壤压缩性和承载能力的影响　出处：《东北林业大学学报》2016年02期 　论文类型：期刊论文

【摘要】：以恢复年限分别为14、36、50 a的落叶松人工林及相邻耕地表层土壤(0~10 cm)为研究对象,采用快速固结试验法,对土壤孔隙比、压缩指数、先期固结压力等指标进行测试,分析植被恢复对典型黑土表层土壤压缩性、承载能力的影响。结果表明:土壤孔隙比、压缩指数、先期固结压力,均随恢复年限的增加而增加,压缩指数、先期固结压力变化范围分别为0.231~0.399、4.2~100.0 k Pa。落叶松林地土壤压缩指数、先期固结压力,均显著高于耕地土壤(p0.05);随植被恢复年限的增加,典型黑土表层土壤压缩性、承载能力逐渐提高,耕性有所增强。土壤力学性质指标与理化性质之间,表现出显著的相关性(p0.05);压缩指数与土壤黏粒比例、有机质质量分数之间关系更为紧密(p0.01);先期固结压力与土壤黏粒比例呈极显著负相关(p0.01)。植被恢复导致土壤有机质质量分数的增加;土壤密度和黏粒比例的降低,是黑土表层土壤压缩性增加、土壤承载能力增强的重要原因。
[Abstract]:In the recovery period were larch plantation and adjacent farmland soil 14,36,50 a (0~10 cm) as the research object, using the rapid consolidation test, the soil porosity ratio, compression index and preconsolidation pressure are tested on compressibility of typical black soil surface soil vegetation recovery analysis, effects of bearing capacity. The results showed that the soil void ratio, compression index, preconsolidation pressure, increased with time increasing, the compression index, the preconsolidation pressure range were 0.231~0.399,4.2~100.0 K Pa. forest soil preconsolidation pressure, compression index, were significantly higher than that of cultivated soil (P0.05); with the increase of vegetation restoration years, soil the surface soil compressibility, improve the bearing capacity gradually, tillage increased. Between the index of mechanical properties and soil physicochemical properties showed significant correlation (P0.05) refers to the compression; The number and proportion of clay soil, the relationship between organic matter content more closely (P0.01); preconsolidation pressure and soil clay ratio showed a significant negative correlation (P0.01). Vegetation restoration resulted in increased soil organic matter content; reduce the soil density and clay ratio, soil surface soil compressibility is increased an important reason, enhance soil bearing capacity.

【作者单位】：东北林业大学;
【基金】：国家林业公益性行业科研专项(201404202)
【分类号】：S714.2;S152.9
【正文快照】： 1)国家林业公益性行业科研专项(201404202)。wnefu@163.com。Effects of Vegetation Recovery on Topsoil Compressibility and Load Support Capacity of Typical Black Soil//HanShaojie,Wang Enheng,Luo Song,Chen Xiangwei(Northeast Forestry University,Harbin 150040,P

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