冻融过程中土壤颗粒组成的重建:研究综述（英文）

发布时间：2017-09-13 22:14

  本文关键词：冻融过程中土壤颗粒组成的重建:研究综述（英文）

  更多相关文章： aggregate stability aggregation fragmentation mineral particle soil granulometric composition soil structure

【摘要】：Studies conducted over several decades have shown that the freeze-thaw cycles are a process of energy input and output in soil,which help drive the formation of soil structure,through water expansion by crystallization and the movement of water and salts by thermal gradients.However,most of these studies are published in Russian or Chinese and are less accessible to international researchers.This review brought together a wide range of studies on the effects of freezing and thawing on soil structure.The following findings are summarized:i) soil structure after freeze-thaw cycles changes considerably and the changes are due to the mechanical fragmentation of soil coarse mineral particles and the aggregation of soil fine particles;ii) the particle size of soil becomes homogeneous and the variation in soil structure weakens as the number of freeze-thaw cycles increases;iii) in the freezing process of soil,an important principle in the variation of soil particle bonding is presented as:condensation → aggregation→crystallization;iv) the freeze-thaw cycling process has a strong effect on soil structure by changing the granulometric composition of mineral particles and structures within the soil.The freeze-thaw cycling process strengthens particle bonding,which causes an overall increase in aggregate stability of soil,showing a process from destruction to reconstruction.
【作者单位】： State
【关键词】： aggregate stability aggregation fragmentation mineral particle soil granulometric composition soil structure
【基金】：supported by the Natural Science Foundation of China(No.41301070) the National Key Basic Research Program(973 Program) of China (No.2012CB026106) the West Light Program for Talent Cultivation of Chinese Academy of Sciences(toDr.ZHANG Ze) the Scientific Research Foundation for the Returned Overseas Chinese Scholars,China Ministry of Education(to Dr.ZHANG Ze) the Scientific and Technical Projects of the Transport Department of Gansu Province,China(No.2014-03)
【分类号】：S152
【正文快照】： INTRODUCTION Due to the periodic changes of atmospheric tempe-rature with seasons,soils in seasonally and permafrost(frozen ground)regions are inevitably subjected to pe-riodic freezing and thawing,with temperatures alter-nately rising above and falling

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