ISWC OpenIR  > 水保所知识产出(1956---)
冻融循环对风沙土物理性质及抗冲性的影响试验
肖俊波1; 孙宝洋1; 李占斌1,2
2017
Source Publication水土保持学报
Volume31Issue:2Pages:67-71
Abstract

为揭示冻融循环对土壤物理性质及抗冲性的影响,以内蒙古坡耕地风沙土为研究对象,控制冻融循
环次数( 0~10 次)和土壤质量含水量(
6% , 9% , 12% ) 2 个因素,在室内模拟野外冻融循环和径流冲刷过
程,定量分析冻融循环对土壤含水量、容重、孔隙度及土壤抗冲性的影响规律。结果表明:( 1 )土壤含水量
随冻融循环次数增加呈缓慢增加的趋势,增加幅度为 0.51%~0.87% ,且高含水量土壤增幅比低含水量土
壤大;( 2 )随冻融循环次数的增加,土壤容重和孔隙度分别呈缓慢减小和增大趋势,且变化幅度逐渐降低,
最后达到基本稳定的状态,达稳定状态后的土壤容重比未冻融土壤小( 0.05±0.01 )
g / cm
3 ;(
3 )当冻融循环
次数相同时,高含水量( 12% )的土壤容重比低含水量(
6% )小,而孔隙度和土壤抗冲性的降低幅度与之相
反;( 4 )冻融循环次数对风沙土抗冲系数具有显著影响,试验土样抗冲性随冻融循环次数的增加呈显著降
低趋势,但是第 6 次冻融循环后,试验土样的含水量、容重、孔隙度及抗冲性的变化均逐渐趋于稳定。研究
结果可为季节性冻融区土壤侵蚀机理研究提供参考。

Other 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 ( 0to 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±0.01g
/ cm

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.

Keyword风沙土 冻融作用 冻融循环 土壤抗冲性
Indexed By中文核心期刊要目总览
Language中文
Document Type期刊论文
Identifierhttp://ir.iswc.ac.cn/handle/361005/8379
Collection水保所知识产出(1956---)
Corresponding Author李占斌
Affiliation1.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
Corresponding Author Affilication中国科学院水利部水土保持研究所
Recommended Citation
GB/T 7714
肖俊波,孙宝洋,李占斌. 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.
APA 肖俊波,孙宝洋,&李占斌.(2017).冻融循环对风沙土物理性质及抗冲性的影响试验.水土保持学报,31(2),67-71.
MLA 肖俊波,et al."冻融循环对风沙土物理性质及抗冲性的影响试验".水土保持学报 31.2(2017):67-71.
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