文章摘要
孙义秋, 顾汪明, 关颖慧, 吴海龙.冻融循环作用对黑土团聚体破碎机制的影响[J].水土保持学报,2021,35(3):53~60
冻融循环作用对黑土团聚体破碎机制的影响
Effect of Freeze-thaw Cycle on the Fragmentation Mechanism of Black Soil Aggregates
投稿时间:2020-10-19  
DOI:10.13870/j.cnki.stbcxb.2021.03.008
中文关键词: 冻融循环  破碎机制  黑土团聚体
英文关键词: freeze-thaw cycle  fragmentation mechanism  black soil aggregates
基金项目:战略性国际科技创新合作重点专项(2016YFE0202900)
作者单位E-mail
孙义秋1, 顾汪明2,3, 关颖慧3, 吴海龙1 1. 天津理工大学环境科学与安全工程学院, 天津 300384

2. 济宁自然资源和规划局
, 山东 济宁 272000

3. 北京林业大学水土保持学院
, 北京 100083 
wuhailong@email.tjut.edu.cn 
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中文摘要:
      为探究冻融循环作用对黑土团聚体抵抗不同破坏作用能力的影响,以黑龙江省典型黑土耕作层土壤为研究对象,通过LB法的3种不同破碎处理,分析冻融循环次数、初始含水量对不同初始粒级土壤团聚体稳定性的作用机制。结果表明:冻融循环作用对1~2,2~3,3~5 mm不同粒级团聚体稳定性有显著影响(P<0.05),其稳定性均呈现为湿润振荡(WS) > 慢速湿润(SW) > 快速湿润(FW),快速湿润(FW)处理对黑土团聚体稳定性的破坏作用最大,而慢速湿润(SW)和湿润振荡(WS)破坏作用较小。同时,初始含水量和冻融循环次数对3种不同粒级团聚体的快速湿润平均重量直径(MWDFW)、慢速湿润平均重量直径(MWDSW)、湿润振荡平均重量直径(MWDWS)均具有极显著影响(P<0.01)。随着冻融循环交替次数的增加,> 0.2 mm的大团聚体破碎而小团聚体(<0.2 mm)含量增加。初始含水量对于2~3,3~5 mm粒级团聚体具有破坏作用,而对1~2 mm粒级团聚体有助于改良团聚体结构,增大团聚体稳定性。
英文摘要:
      In order to explore the effect of freeze-thaw cycle on the ability of black soil aggregate to resist the influence of different damage. the typical black soil of Heilongjiang province was taken as the research object. and the effects of freeze-thaw cycles and the initial moisture content on stability of soil aggregate with different initial size were analyzed through three different crushing processes of LB method. The results showed that the freeze-thaw cycles had significant effect on the stability of aggregates with different size of 1~2, 2~3 and 3~5 mm (P<0.05). The stability of aggregates followed the order of wetting oscillation (WS) > slow wetting (SW) > fast wetting (FW). FW treatment had the greatest damage to the stability of black soil aggregates, while the SW treatment and WS treatment had less damage. At the same time, the initial water content and the number of freeze-thaw cycle had extremely significant influence on the MWDFW, MWDSW and MWDWS of three different sizes aggregates (P<0.01). With the increasing of the number of freeze-thaw cycle, the large aggregate of >0.2 mm was broken and the content of the small aggregate (<0.2 mm) increased. The initial water content had a destructive effect on 2~3 and 3~5 mm aggregates, while for 1~2 mm aggregates, it was helpful to improve the structure and increase the stability of aggregates.
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