山丘区中小河流滩地土壤物理性质及空间分布特征

发布时间：2019-01-18 07:00

【摘要】：为探求山丘区中小河流滩地土壤物理性质及空间分布特征,以浙江省龙游县灵山港滩地为试验对象,通过野外取样与室内测定分析,分析研究了山丘区中小河流滩地表层土壤的密度、体积质量、孔隙度、饱和含水率、颗粒组成等滩地土壤物理性质变化与空间分布特征。结果表明,河道沿线滩地土壤物理性质空间差异性显著,主要表现为:(1)从上游至下游,滩地土壤密度沿程降低,中游区段土壤体积质量最小,总孔隙度以及饱和含水率最大。(2)土壤颗粒组成以粗颗粒(粗砂,细砂)为主,在河道纵向上,随着河道坡降变缓,水流能态减小,粗颗粒质量分数降低,细颗粒(粉粒,黏粒)质量分数及土壤粒径分维值(D)增加,滩地土壤颗粒沿程细化。(3)由于水流条件及植被类型的影响,在不同滩位上,高滩处林地土壤细颗粒组质量分数及土壤粒径分维值最高,分别为36.38%和2.66,土壤粒径分维值能够反映出不同沉积环境对土壤颗粒分布的影响。
[Abstract]:In order to find out the physical properties and spatial distribution of soil in middle and small river beach in hilly area, taking Lingshan beach in Longyou County, Zhejiang Province as the experimental object, field sampling and indoor measurement and analysis were carried out. The changes of physical properties and spatial distribution of the surface soil of middle and small rivers in hilly area were studied, such as density, volume mass, porosity, saturated water content and particle composition. The results showed that the spatial difference of soil physical properties along the channel was significant, mainly as follows: (1) from upstream to downstream, the soil density decreased along the course, and the soil volume mass was the smallest in the middle reaches. The total porosity and saturated water content are the largest. (2) the composition of soil particles is mainly coarse grain (coarse sand, fine sand). Along the river channel longitudinal, along with the river slope becomes slower, the flow energy state decreases, the coarse particle mass fraction decreases, the fine grain (silt), Clay) mass fraction and soil particle size fractal dimension (D) increased, and soil particle size was refined along the beach. (3) due to the influence of water flow and vegetation types, the soil particles were located at different beach locations. The soil fine particle fraction and fractal dimension of soil particle size were 36.38% and 2.66, respectively. The fractal dimension values of soil particle size could reflect the influence of different sedimentary environment on the distribution of soil particles.
【作者单位】：河海大学水利水电学院;龙游县水利局;南京市水务局;
【基金】：国家自然科学基金项目(41471069) 浙江省水利科技项目(RC1527)
【分类号】：S152

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