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[1]DING Huihui,CHEN Wensheng,LI Jiangrong.Effect of Seasonal Freeze-Thaw on the Stability of Soil Aggregates in the Forest of Sergyemla Mountain[J].Research of Soil and Water Conservation,2023,30(01):120-127.[doi:10.13869/j.cnki.rswc.20220729.001]

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Effect of Seasonal Freeze-Thaw on the Stability of Soil Aggregates in the Forest of Sergyemla Mountain

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 30 Number of periods: 2023 01 Page number: 120-127 Column: Public date: 2023-01-10

Title:: Effect of Seasonal Freeze-Thaw on the Stability of Soil Aggregates in the Forest of Sergyemla Mountain

Author(s):: DING Huihui^1,2,3,4, CHEN Wensheng^1,2,3,4, LI Jiangrong^1,2,3,4; (1.Research Institute of Tibet Plateau Ecology, Tibet Agriculture & Animal Husbandry University, Nyingchi, Tibet 860000, China; 2.Key Laboratory of Forest Ecology in Tibet Plateau, Ministry of Education, Nyingchi, Tibet 860000, China; 3.National Key Station of Field Scientific Observation & Experiment, Nyingchi, Tibet 860000, China; 4.Key Laboratory of Alpine Vegetation Ecological Security in Tibet, Nyingchi, Tibet 860000, China)

Keywords:: seasonal freezing and thawing; soil aggregate; wet screening method; soil stability; Sergyemla

CLC:: S152.4

DOI:: 10.13869/j.cnki.rswc.20220729.001

Abstract:: The forest soil of Sergyemla Mountain in southern Tibet was used as the study object to examine the influence of seasonal freezing and thawing on the stability of soil aggregates, and the composition of aggregates was measured by using the wet sieving method in field controlled trials. The structure of each particle-sized aggregate changes, soil water content(SWC), 0.25 mm water stability aggregate content(WSA), mean weight diameter(MWD), geometric mean diameter(GMD), the fractal dimension D, the erodibility index K value, and the relationship between these parameters in 0—10 cm, 10—20 cm and 20—30 cm of the soil layers were analyzed. The results show that:(1)seasonal freezing and thawing resulted in the decrease in the content of big aggregates, the increase in the content of tiny aggregates, and an imbalance in soil structure;(2)water content is a crucial component influencing aggregate stability;(3)the seasonal freeze-thaw effect affected the stability of soil aggregates by decreasing MWD and GMD and increasing D and K values;(4)when the number of soil freezing and thawing events in STF-One fell within a particular range, WSA rose and soil stability improved;(5)correlation analysis of the indicators revealed that the valuses of WSA, MWD, and GMD were negatively linked with the D and K values;(6)the 0.5 mm particle size is an essential key point in the soil structure modification in SFT-Ys type soil. These research results can provide evidence to support the impacts of seasonal freezing and thawing on soil stability as well as a theoretical basis for permafrost erosion.

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Last Update: 2023-01-10