黑龙江省冻融作用和含水率对砂土可蚀性的影响分析  

Analysis of the Influence of Freeze-thaw Action and Water Content on Erodibility of Sandy Soil in Heilongjiang Province

作　　者：何泽鑫 陈末 He Zexin;Chen Mo(School of Hydraulic and Electric-power,Heilongjiang University,Harbin 150080,China;Institute of Cold Groundwater,Heilongjiang University,Harbin 150080,China)

机构地区：[1]黑龙江大学水利电力学院,哈尔滨150080 [2]黑龙江大学寒区地下水研究所,哈尔滨150080

出　　处：《黑龙江科学》2024年第18期7-10,15,共5页Heilongjiang Science

摘　　要：我国东北地区普遍存在冻融侵蚀现象,其主要原因是土体内部的水冻胀变形。在复杂的地质演变过程中,土壤发生膨胀并伴随变形,这种现象一旦持续便会引发土壤的进一步膨胀,加速土壤侵蚀,不仅会对农业生产造成严重影响,还会对土地资源的保护构成威胁。为研究冻融作用对砂土侵蚀的影响,采用单向冻结实验,通过对比冻融作用前后土壤容重、含水率、孔隙度、渗透系数,分析冻融作用对砂土可蚀性的影响。研究发现,土的容重随冻融循环次数的增加而降低,而孔隙度则随之增加;在冻融作用下,孔隙度随初始含水量的增大而增大;随着温度的升高,土体的渗透性也随之增加。总体上,冻融过程会改变土壤的容重、孔隙度、渗透性及土壤结构,从而对土壤可蚀性产生重要影响,此结果有助于合理利用土地资源,减少水土流失和环境损害,更加全面地了解砂土的可蚀性。The phenomenon of freeze-thaw erosion is widespread in Northeast China,and the main reason is that the water inside the soil is deformed by frost heave.In this complex geological evolution process,the soil expands and is accompanied by deformation.Once this phenomenon continues,it will trigger further expansion of the soil,and then accelerate the process of soil erosion.This change not only has a serious impact on agricultural production,but also poses a great challenge to the protection of land resources.The study analyzes the influence of freeze-thaw on sand erosion;compares the bulk density,moisture content,porosity and permeability coefficient of soil before and after freeze-thaw action,and analyzes the influence of freeze-thaw on sand erosion.The bulk density of soil decreases with the increase of freeze-thaw cycles,while the porosity increases.Under freeze-thaw action,the porosity increases with the increase of initial water content.With the increase of temperature,the permeability of soil also increases.In general,the freeze-thaw process will change the bulk density,porosity,permeability and permeability of soil,as well as soil structure,which will have an important impact on soil erosion.This will help to rationally use land resources,reduce soil erosion and environmental damage,and have a more comprehensive understanding of the erosibility of sand.

关 键 词：冻融侵蚀 砂土侵蚀 初始含水率 

分 类 号：S157.1[农业科学—土壤学]