1.College of Hydraulic & Environmental Engineering,China Three Gorges University,Yichang,Hubei 443002,China
2.Hubei Provincial Engineering Research Center of Slope Habitat Construction Technique Using Cement-based Materials;(China Three Gorges University),Yichang,Hubei 443002,China
3.College of Civil Engineering & Architecture,China Three Gorges University,Yichang,Hubei 443002,China
Objective To investigate the stability and erodibility characteristics of soil aggregates in Pinus massoniana forests on granite weathering crusts in different zones. Methods Soil samples were collected from six sites of typical P. massoniana forests developed on granite weathering crusts in Luotian (Hubei), Chongyang (Hubei), Loudi (Hunan), Xinyu (Jiangxi), Nanning (Guangxi), and Chongzuo (Guangxi). The particle size distribution of soil aggregates was determined using the wet sieving method. The content of water-stable aggregates > 0.25 mm (R0.25), mean weight diameter (MWD), geometric mean diameter (GMD), and soil erodibility K value were calculated. Furthermore, the influence of physicochemical properties on aggregate stability and erodibility was analyzed. Results 1) The aggregate content differed significantly among sites, and aggregates>0.25 mm dominated (82.00%-93.54%). Among them, the macroaggregate content in Xinyu was significantly higher than that in Chongzuo. 2) There were significant differences in aggregate stability and erodibility among the sites. The aggregates from Xinyu exhibited the highest stability and the lowest erodibility, while those from Luotian showed the lowest stability and the highest erodibility. 3) Correlation analysis indicated that aggregates>2 mm were positively correlated with stability indicators and negatively correlated with erodibility, while aggregates of other sizes were negatively correlated with stability indicators and positively correlated with erodibility. 4) RDA analysis revealed that soil aggregate stability was positively correlated with pH and negatively correlated with available phosphorus, while soil erodibility showed an opposite trend. This indicated that pH and available phosphorus were the core environmental factors driving changes in aggregate stability and erodibility across the sample plots, together explaining 77.7% of the variation (p<0.01). Conclusion The stability and erodibility of soil aggregates in P. massoniana forests on granite weathering crusts are comprehensively influenced by pH, available phosphorus, and particle size composition. When assessing soil erosion risk, priority should be given to texture and pH. Luotian, Nanning, and Chongzuo, due to their high erodibility, should be regarded as priority areas for soil and water conservation. The research findings provide a scientific basis for the prevention and control of soil erosion in the P. massoniana ecosystem in granite weathering crust areas.
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