中南地区典型地带性土壤的斥水性及其影响因素分析
发布时间：2018-08-01 15:42
【摘要】：选取我国中南地区不同发育程度典型旱作土壤为研究对象,通过测定土壤基本理化性质与滴水穿透时间(WDPT),探究了该区域土壤斥水性变化规律及其影响因素。结果表明,(1)自北向南,随着水热条件增加,土壤p H值逐渐降低,游离氧化物(Fed、Ald)逐渐增加,非晶质氧化物(Feo、Alo)没有明显的地带性变化;表层有机质量高于下层,而林地表层高于耕地表层;(2)供试土壤均为亲水性土壤,WDPT分布在0.47~4.00 s之间,自北向南土壤斥水性整体呈逐渐降低的趋势;(3)WDPT与p H值、CEC、粉粒量显著正相关(r0.54,p0.05),砂粒量、非晶质氧化铁(Feo)、游离氧化铁、铝(Fed、Ald)与WDPT呈负相关关系(r-0.56,p0.05)。逐步回归分析表明,Fed和Feo对土壤斥水性的影响最显著(R2=0.71,p0.01),可以用来评价和预测土壤斥水性。
[Abstract]:Typical dryland soils of different developmental degrees in the central and southern regions of China were selected as the research objects. The variation of soil water repellency and its influencing factors were studied by measuring the basic physical and chemical properties of soil and the time of water dripping through (WDPT),. The results showed that: (1) from north to south, with the increase of hydrothermal conditions, the pH value of soil gradually decreased, the free oxide (Fedo Ald) increased gradually, the amorphous oxide (FeoC Alo) had no obvious zonation change, and the surface organic mass was higher than that of the lower layer. However, the surface layer of woodland was higher than that of cultivated land, (2) the hydrophilic soil WDPT was distributed in the range of 0.47 ~ 4.00 s, and the water repellency decreased gradually from north to south. (3) WDPT and pH value were positively correlated with the amount of silt (r0.54p0.05). There was a negative correlation between (Feo), free iron oxide and aluminum (Fedo Ald) and WDPT (r-0. 56% p0. 05). Stepwise regression analysis showed that the effects of Fed and Feo on soil hydrophobicity were the most significant (R22.71p0.01), which could be used to evaluate and predict soil hydrophobicity.
【作者单位】： 华中农业大学资源与环境学院;湖北省水利水电科学研究院;
【基金】：国家自然科学基金青年科学基金项目(41401317);国家自然科学基金项目(41401303) 华中农业大学大学生科技创新基金项目(2015081)
【分类号】：S152.7
本文编号：2158047
[Abstract]:Typical dryland soils of different developmental degrees in the central and southern regions of China were selected as the research objects. The variation of soil water repellency and its influencing factors were studied by measuring the basic physical and chemical properties of soil and the time of water dripping through (WDPT),. The results showed that: (1) from north to south, with the increase of hydrothermal conditions, the pH value of soil gradually decreased, the free oxide (Fedo Ald) increased gradually, the amorphous oxide (FeoC Alo) had no obvious zonation change, and the surface organic mass was higher than that of the lower layer. However, the surface layer of woodland was higher than that of cultivated land, (2) the hydrophilic soil WDPT was distributed in the range of 0.47 ~ 4.00 s, and the water repellency decreased gradually from north to south. (3) WDPT and pH value were positively correlated with the amount of silt (r0.54p0.05). There was a negative correlation between (Feo), free iron oxide and aluminum (Fedo Ald) and WDPT (r-0. 56% p0. 05). Stepwise regression analysis showed that the effects of Fed and Feo on soil hydrophobicity were the most significant (R22.71p0.01), which could be used to evaluate and predict soil hydrophobicity.
【作者单位】： 华中农业大学资源与环境学院;湖北省水利水电科学研究院;
【基金】：国家自然科学基金青年科学基金项目(41401317);国家自然科学基金项目(41401303) 华中农业大学大学生科技创新基金项目(2015081)
【分类号】：S152.7
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