Quick Search:       Advanced Search
How freezing and thawing processes affect black-soil aggregate stability in northeastern China
    Click here to download the full text
Citation of this paper:Feng Wang,XiaoZeng Han,LiangHao Li,KeQiang Zhang,2010.How freezing and thawing processes affect black-soil aggregate stability in northeastern China.Sciences in Cold and Arid Regions,2(1):0067~0072.
Hits: 18026
Download times: 5374
Author NameAffiliationE-mail
Feng Wang 1. Institute of Agro-environmental Protection, Ministry of Agriculture, Tianjin 300191, China 2. National Field Research Station of Agro-ecosystem in Hailun, Northeast Institute of Geography and Agro-ecology, Chinese Academy of Sciences, Harbin 150081, Ch wangfeng_530@163.com 
XiaoZeng Han National Field Research Station of Agro-ecosystem in Hailun, Northeast Institute of Geography and Agro-ecology, Chinese Academy of Sciences, Harbin 150081, China  
LiangHao Li National Field Research Station of Agro-ecosystem in Hailun, Northeast Institute of Geography and Agro-ecology, Chinese Academy of Sciences, Harbin 150081, China  
KeQiang Zhang Institute of Agro-environmental Protection, Ministry of Agriculture, Tianjin 300191, China  
 
Abstract:Laboratory experiments were carried out to investigate the effect of freezing and thawing processes on wet aggregate stability (WAS) of black soil. Wet aggregate stability was determined by different aggregate size groups, different water contents, various freeze–thaw cycles, and various freezing temperatures. The results showed that, when at suitable water content, aggregate stability was enhanced, aggregate stability will be disrupted when moisture content is too high or too low, especially higher water content. Temperature also had a significant effect, but moisture content determined the suitable freezing temperatures for a given soil. Water-stable aggregate (WSA>0.5), the total aggregate content, and mean weight diameter decreasing with the freeze–thaw cycles increase, reached to 5 percent significance level. The reason for crumbing aggregates is the water and air conflict, thus raising the hypothesis that water content affects the aggregate stability in the process of freezing and thawing.
keywords:freezing and thawing processes  black soil  water-stable aggregates  mean weight diameter
HTML  View Full Text  View/Add Comment  Download reader