水土保持学报2017，Vol.31Issue(2)：67-71,5.DOI:10.13870/j.cnki.stbcxb.2017.02.013
冻融循环对风沙土物理性质及抗冲性的影响试验
Effects of Freeze-thaw Cycles on Aeolian Sand Soil Physical Properties and Soil Anti-scouribility
摘要
Abstract
Freeze-thaw cycle is one of the significant characteristics of soil thawing process in the area of seasonal freeze-thaw.In order to reveal the influence of freeze-thaw cycles on soil physical properties and soil anti-scouribility,aeolian sandy soil collected in a sloping farmland in Inner Mongolia was taken as the research object.Two factors of freeze-thaw cycles (0 to 10) and soil water content (6％,9％ and 12％) were controlled to simulate field freeze-thaw cycles and the runoff scouring process.The influence of freeze-thaw cycle on soil water content,bulk density,porosity,and soil anti-scouribility was analyzed quantitatively.The results showed that:(1) Soil water content increased with the increasing number of freeze-thaw cycles,and was increased by 0.51％ to 0.87％.The increasing extent for the soil with high water content was greater than for the soil with lower water content.(2) With the increasing number of freeze-thaw cycles,soil bulk density and porosity were decreased and increased slowly,respectively,with the extent of change decreasing gradually,and finally reached a basically stable state,under which soil bulk density was 0.05-±0.01 g/cm3 lower than the soil not subjected to freeze-thaw;(3) When the soil had the same numbers of freeze-thaw cycles,soil bulk density of the soil with high water content (12％) was greater than that of the soil with low water content (6％),but the porosity and soil anti-scouribility showed the opposite trend;(4) The number of freeze-thaw cycle had a significant effect on soil anti-scouribility.Soil anti-scouribility significantly decreased with the increasing number of freeze-thaw cycles.However,after sixth freeze-thaw cycle,the change of water content,bulk density,porosity,and soil anti-scouribility gradually decreased.The results can provide a reference for studying the mechanism of soil erosion in the seasonal freez-thaw area.关键词
风沙土/冻融作用/冻融循环/土壤抗冲性Key words
Aeolian sandy soil/freeze-thaw action/freeze-thaw cycles/soil anti-scouribility分类
农业科技引用本文复制引用
肖俊波,孙宝洋,李占斌,张乐涛,马波..冻融循环对风沙土物理性质及抗冲性的影响试验[J].水土保持学报,2017,31(2):67-71,5.基金项目
国家自然科学基金重点项目(41330858) （41330858）
西北农林科技大学博士科研启动基金项目(2452015345) （2452015345）
西北农林科技大学大学生创新训练项目(201610712035) （201610712035）
