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[1]Dong Tianfu,Deng Zhihao,Yang Jing,et al.Characteristics of Stability of Soil Aggregates at Different Vegetation Restoration Stages in Karst Reclaimed Land[J].Research of Soil and Water Conservation,2024,31(02):33-42.

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Characteristics of Stability of Soil Aggregates at Different Vegetation Restoration Stages in Karst Reclaimed Land

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 31 Number of periods: 2024 02 Page number: 33-42 Column: Public date: 2024-03-20

Title:: Characteristics of Stability of Soil Aggregates at Different Vegetation Restoration Stages in Karst Reclaimed Land

Author(s):: Dong Tianfu^1,2, Deng Zhihao¹, Yang Jing^1,2, Dai Quanhou¹, Nie Yunpeng^2,3; (1.College of Forestry, Guizhou University, Guiyang 550025, China; 2.Huanjiang Observation and Research Station for Karst Ecosystems, Chinese Academy of Sciences, Huanjiang, Guangxi 547100, China; 3.Institute of Subtropical Agriculture, Chinese Academy of Sciences, Changsha 410125, China)

Keywords:: karst; yellow soil; calcareous soil; different vegetation for returning farmland; aggregate stability

CLC:: S152.4

DOI:: -

Abstract:: [Objective] The aims of this study are to investigate the effects of cropland fallowing on soil structure and stability in the development areas of yellow and calcareous soils in Qianzhong Karst Region, and to provide theoretical basis for the prevention and control of soil erosion and evaluation of the benefits of revegetation of fallowed cropland in karst region. [Methods] Differential characteristics of soil aggregate composition and stability in shallow(0—30 cm)soil layers of cropland(YM)and different stages of vegetation restoration after fallow 〔grassland(CD), scrubland(GC), and woodland(LD)〕 were investigated based on the wet-dry sieve method. [Results] The contents of soil mechanical aggregates in the two types of soil development areas decreased with the decrease of particle size, and the content of water stable aggregates decreased at first and then increased with the decrease of particle size, and the main content of soil mechanical aggregates was >1 mm aggregate, and the proportions of yellow loam and lime soil were 82.45% and 84.01%, respectively. The water stable aggregates were mainly >2 mm aggregate, accounting for 53.53% and 54.61%, respectively. The mean weight diameter(MWD)and geometric mean diameter(GMD)of aggregates in yellow soil decreased with the increase of soil depth, while the opposite trend in calcareous soil to that in yellow soil was found. Cluster stability of yellow soil fallow land was better compared to calcareous soils. In general, the MWD and GMD of the two soils were the lowest in YM, and the soil structure damage rate(PAD)was the highest, the stability of soil aggregates in YM was the lowest, and the stability of soil aggregates in different stages of vegetation restoration was improved compared with that in YM. MWD of yellow soil was significantly positively correlated with organic matter content(SOM)and total nitrogen(TN), GMD was significantly positively correlated with SOM, and PAD was significantly positively correlated with silt(p<0.05). MWD and GMD of calcareous soil were significantly positively correlated with sand and total potassium(TK)(p<0.05), and negatively correlated with total phosphorus(TP). PAD was significantly negatively correlated with sand and TK, positively correlated with TP(p<0.01), and positively correlated with clay(p<0.05). The results of multivariate analysis of variance showed that vegetation type, soil depth and soil type had significant effects on soil aggregate stability(p<0.05). [Conclusion] In the two soil development areas, the soil aggregate stability indexes of different vegetation recovery stages after fallow are higher than those of cultivated land, which shows that fallow returning forest to grass effectively improves the stability of soil aggregate and strengthens the ability of soil to resist erosion, and the results of this study can provide theoretical basis for the deployment of soil and water conservation measures and the evaluation of the benefits of fallow land in the karst area.

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Last Update: 2024-04-20