冻融条件下土壤抗冲性的变化特征  

Variation Characteristics of Aeolian Sandy Soil Anti-Scourability under Freezing and Thawing Conditions

作　　者：肖俊波[1] 孙宝洋 李占斌[1,2] 马波[1] 张乐涛[2] 

机构地区：[1]西北农林科技大学水土保持研究所,陕西杨凌712100 [2]中国科学院/水利部水土保持研究所黄土高原土壤侵蚀与旱地农业国家重点实验室,陕西杨凌712100

出　　处：《中国水土保持》2017年第1期37-40,共4页Soil and Water Conservation in China

基　　金：国家自然科学基金重点项目(41330858);西北农林科技大学博士科研启动基金项目(2452015345)

摘　　要：为揭示冻融作用对风沙土抗冲性的影响,以季节性冻融区风沙土为研究对象,通过室内放水冲刷试验对冻融条件下土壤抗冲系数的变化特征进行了研究。结果表明:坡度、放水流量、土壤含水量、冻融循环次数和土层深度对土壤抗冲系数均具有显著影响(P<0.05),土壤抗冲系数对各因素敏感程度大小为坡度>放水流量>土壤含水量>土层深度>冻融循环次数;土壤抗冲系数随坡度、放水流量、冻融循环次数增加而减小,随土壤含水量的增加先增大后减小,随土层深度的增加先减小后增大。In order to reveal the influence of freeze-thaw action to the aeolian sandy soil anti-scourability,the paper studied the variation characteristics of soil anti-scourability coefficients under the conditions of freezing and thawing through indoor scouring tests by taking aeolian sandy soil of seasonal freezing and thawing region as a study object. The outcomes show that a) the slope,outflow discharge,soil moisture content,freezing and thawing cycles and soil depth have significant effects to the soil anti-scourability coefficient( P<0.05). The order of the soil antiscourability coefficient to the sensitivity degree of each factor is slope > outflow discharge > soil moisture content > soil depth > freezing and thawing cycles and; b) the soil anti-scourability coefficient decreases along with the increase of the slope,outflow discharge and freezing and thawing cycles,firstly increases then decreases along with the increase of soil moisture content and firstly decreases then increases along with the increase of soil depth.

关 键 词：冻融作用 土壤抗冲性 变化特征 

分 类 号：S157.1[农业科学—土壤学]