發(fā)布時間：2018-03-03 18:06

  本文選題：紫色土　切入點：碎石　出處：《土壤學報》2017年02期 　論文類型：期刊論文

【摘要】：土壤容重和孔隙分布特征是土壤重要的基本物理性質,但有關含碎石土壤的物理性質以及碎石含量對土壤結構影響的研究尚不多見。三峽庫區(qū)紫色土中存在大量的碎石,為了深刻了解和評價土壤中碎石對容重與大孔隙形成的可能作用,通過野外調查、典型土樣采集和室內分析實驗,探討了三峽庫區(qū)典型土地利用類型下土壤中的碎石體積含量以及不同粒徑碎石的基本物理性質及其對土壤容重和孔隙特征的影響。結果表明:土壤中碎石的孔隙度和飽和含水率隨著碎石粒徑的減小而增大,小碎石本身具有一定的持水、供水性能;碎石含量對土壤的總容重、細土容重有顯著影響,隨著碎石含量的增加,土壤的總容重逐漸增加,而細土容重與碎石含量呈線性負相關關系,土壤中碎石的存在有利于改善土壤的結構;土壤孔隙分布特征與碎石含量密切相關,隨著碎石含量的提高,土壤總孔隙度和毛管孔隙度呈減少趨勢,而非毛管孔隙度即大孔隙呈增加趨勢,碎石的存在有利于改善土壤的透水性能。本研究為山區(qū)農用地灌溉與水分管理提供了科學依據。
[Abstract]:Soil bulk density and pore distribution are important basic physical properties of soil, but there are few studies on the physical properties of macadam soil and the influence of crushed stone content on soil structure. There is a large amount of crushed stone in purple soil of the three Gorges Reservoir area. In order to deeply understand and evaluate the possible effect of crushed stone on bulk density and macropore formation in soil, field investigation, collection of typical soil samples and laboratory analysis experiments were carried out. The volume content of crushed stone in soil, the basic physical properties of gravel with different particle sizes and its influence on bulk density and pore characteristics of soil under typical land use types in the three Gorges Reservoir area are discussed. The results show that the pore size of crushed stone in soil is very high. The degree and saturated moisture content increase with the decrease of gravel particle size. The aggregate content has a significant effect on the total bulk density of soil and the bulk density of fine soil. With the increase of crushed stone content, the total bulk density of soil increases gradually. There is a linear negative correlation between the bulk density of fine soil and the content of crushed stone, and the existence of crushed stone in soil is beneficial to improve the soil structure, the distribution of soil pore is closely related to the content of crushed stone, and the content of crushed stone increases with the increase of the content of crushed stone. Soil total porosity and capillary porosity showed a decreasing trend, while non-capillary porosity, that is, macroporosity, showed an increasing trend, and the existence of gravel was beneficial to improve soil permeability. This study provided scientific basis for irrigation and water management of agricultural land in mountainous areas.
【作者單位】： 西南大學資源環(huán)境學院三峽庫區(qū)生態(tài)環(huán)境教育部重點實驗室;華中農業(yè)大學資源與環(huán)境學院水土保持研究中心;
【基金】：國家自然科學基金項目(41401298) 中央高校基本科研業(yè)務費專項(XDJK2013C152) 高等學校博士學科點專項科研基金新教師類課題(20130182120015)共同資助~~
【分類號】：S152.5

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本文編號：1562109