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RSS FeedsSustainability, Vol. 12, Pages 1587: Structural Changes of Compacted Soil Layers in Northeast China due to Freezing-thawing Processes (Sustainability)

 
 

20 february 2020 19:02:53

 
Sustainability, Vol. 12, Pages 1587: Structural Changes of Compacted Soil Layers in Northeast China due to Freezing-thawing Processes (Sustainability)
 


Soil compaction has become a global concern that reduces soil quality and mayjeopardize agricultural sustainability. The objective of this study is to evaluate if the freezing–thawing process can alleviate the negative effects of soil compaction during overwinter time inNortheast China. The field experiment was a split plot design including two surface treatments(bare and mulch) and three compaction levels (low, moderate, and high compactions with initialbulk densities of 1.2, 1.4 and 1.6 g cm-3). Results showed that compared with initial values in the fall,freezing–thawing events increased soil porosity (by 4.28% to 25.68%) and the ratio of large-sizepores (by 44.5% to 387.6%) after thawing in the spring. The greatest changes were observed in thehigh compaction treatment, and mulch-enhanced soil structural transformation. Additionally, theratio of large-size aggregates (>1 mm) was increased and the fraction of small-size aggregates (<1mm) was decreased. These changes in soil structural characteristics were attributed mainly to themodification of ice-filled pores space during the overwinter period. We concluded that the freezing–thawing process was an effective natural force for ameliorating soil compaction in Northeast China.


 
208 viewsCategory: Ecology
 
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