黏粒添加量对不同有机碳含量黑土抗压特性的影响

发布时间：2018-03-13 19:29

本文选题：有机质　切入点：黏粒　出处：《中国农业科学》2016年08期 　论文类型：期刊论文

【摘要】：【目的】农业机械田间作业对土壤造成的碾压会显著影响土壤物理性质与结构,进而对作物产量与土壤环境产生重大影响。论文旨在探究不同黏粒添加量对有机碳含量不同的黑土土壤抗压特性的影响规律。【方法】通过人工提取黏粒的方式向有机碳(TOC)含量不同的3种黑土(M0、M1、M2)中分别添加不同量的黏粒0%、10%、20%、40%(记做C0、C1、C2、C3),制备不同TOC和黏粒含量的土壤样品(M0C0、M0C1、M0C2、M0C3、M1C0、M1C1、M1C2、M1C3、M2C0、M2C1、M2C2、M2C3)。调整土壤含水量为20%,容重1.1 g·cm-3,进行室内单轴压缩试验,测定压缩曲线并求得相应的土壤先期固结压力σp(k Pa)与土壤压缩指数Cc。【结果】有机碳含量相同的条件下,黏粒含量越高,压缩曲线塑性部分的斜率越大;当黏粒含量相同时,外施压力相同时,随着有机碳含量的增加,土壤孔隙比随之增大。黏粒添加量、TOC及其交互作用对黑土土壤的σp、Cc均会产生显著影响(P0.05);其中黏粒添加量与TOC均与土壤σp呈极显著正相关关系,黏粒添加量与Cc相关关系并不显著,且TOC与Cc之间相关性也并不明显。【结论】黏粒与TOC含量的增加均会使黑土先期固结压力增大;土壤TOC含量与黏粒含量越高,压缩指数越大,土壤被压缩后越容易发生形变。
[Abstract]:[objective] the physical properties and structure of soil were significantly affected by the rolling of soil caused by field operation of agricultural machinery. The purpose of this paper is to explore the effect of different clay content on the soil pressure resistance of black soil with different organic carbon content. [methods] the method of artificial extraction of clay was used to study the effect of clay content on soil pressure resistance of black soil with different organic carbon content. Different amounts of clay were added to the three kinds of black soil with different organic carbon (TOC) content. The soil samples with different TOC and clay content were prepared. The soil samples with different TOC and clay content were prepared and tested by uniaxial compression test. The soil samples with different TOC and clay content were added to M0C0C0M0C1M1C1C1C1C1C1C2C2M2M2C3, adjusted soil water content was 20g 路cm ~ (-3), adjusted soil water content was 20g 路cm ~ (-3), and carried out an indoor uniaxial compression test. The soil moisture content was adjusted to 20g 路cm ~ (-3) and the soil water content was adjusted to be 20g 路cm ~ (-3). The soil moisture content was adjusted to 20g 路cm ~ (-3), and the soil moisture content was adjusted to 20g 路cm ~ (-3), and the soil moisture content was adjusted to 20g 路cm ~ (-3), and the soil moisture content was adjusted to 1.1g 路cm ~ (-3). The compression curve is measured and the corresponding soil preconsolidation pressure 蟽 pnk Paand the soil compression index Cc. [results] the higher the clay content, the larger the slope of the plastic part of the compression curve, when the clay content is the same, When external pressure is the same, with the increase of organic carbon content, The ratio of soil porosity increased with the increase of soil void ratio. The addition of clay and its interaction had a significant effect on 蟽 P0. 05 C of black soil, and there was a very significant positive correlation between clay addition and soil 蟽 p, especially between clay addition and soil 蟽 p. The correlation between clay content and C _ c is not significant, and the correlation between TOC and C _ c is not obvious. [conclusion] the increase of clay and TOC content will increase the preconsolidation pressure of black soil, and the higher the content of TOC and clay, the greater the compression index of black soil. The more easily the soil is compressed, the more likely it is to deform.
【作者单位】：沈阳农业大学土地与环境学院/土壤肥料资源高效利用国家工程实验室/农业部东北耕地保育重点实验室;
【基金】：国家科技支撑计划(2012BAD05B0) 国家公益性行业(农业)科研专项(201303125) 辽宁省科技创新团队项目(2015213001)
【分类号】：S152

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