本文選題：有機質　切入點：黏粒　出處：《中國農(nóng)業(yè)科學》2016年08期 　論文類型：期刊論文

【摘要】：【目的】農(nóng)業(yè)機械田間作業(yè)對土壤造成的碾壓會顯著影響土壤物理性質與結構,進而對作物產(chǎn)量與土壤環(huán)境產(chǎn)生重大影響。論文旨在探究不同黏粒添加量對有機碳含量不同的黑土土壤抗壓特性的影響規(guī)律。【方法】通過人工提取黏粒的方式向有機碳(TOC)含量不同的3種黑土(M0、M1、M2)中分別添加不同量的黏粒0%、10%、20%、40%(記做C0、C1、C2、C3),制備不同TOC和黏粒含量的土壤樣品(M0C0、M0C1、M0C2、M0C3、M1C0、M1C1、M1C2、M1C3、M2C0、M2C1、M2C2、M2C3)。調(diào)整土壤含水量為20%,容重1.1 g·cm-3,進行室內(nèi)單軸壓縮試驗,測定壓縮曲線并求得相應的土壤先期固結壓力σp(k Pa)與土壤壓縮指數(shù)Cc�！窘Y果】有機碳含量相同的條件下,黏粒含量越高,壓縮曲線塑性部分的斜率越大;當黏粒含量相同時,外施壓力相同時,隨著有機碳含量的增加,土壤孔隙比隨之增大。黏粒添加量、TOC及其交互作用對黑土土壤的σp、Cc均會產(chǎn)生顯著影響(P0.05);其中黏粒添加量與TOC均與土壤σp呈極顯著正相關關系,黏粒添加量與Cc相關關系并不顯著,且TOC與Cc之間相關性也并不明顯�！窘Y論】黏粒與TOC含量的增加均會使黑土先期固結壓力增大;土壤TOC含量與黏粒含量越高,壓縮指數(shù)越大,土壤被壓縮后越容易發(fā)生形變。
[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.
【作者單位】： 沈陽農(nóng)業(yè)大學土地與環(huán)境學院/土壤肥料資源高效利用國家工程實驗室/農(nóng)業(yè)部東北耕地保育重點實驗室;
【基金】：國家科技支撐計劃(2012BAD05B0) 國家公益性行業(yè)(農(nóng)業(yè))科研專項(201303125) 遼寧省科技創(chuàng)新團隊項目(2015213001)
【分類號】：S152

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1 陳金波,代春波;原狀結構性土先期固結壓力及結構強度的確定[J];黑龍江水利科技;2004年02期

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本文編號：1607840