李禹江, 张荣, 王琴, 张瀚文, 李婧, 王芳, 涂利华, 郝建锋. 坡向和坡位对夹金山灌丛土壤团聚体稳定性的影响[J]. 云南大学学报(自然科学版), 2022, 44(3): 522-532. doi: 10.7540/j.ynu.20210466
引用本文: 李禹江, 张荣, 王琴, 张瀚文, 李婧, 王芳, 涂利华, 郝建锋. 坡向和坡位对夹金山灌丛土壤团聚体稳定性的影响[J]. 云南大学学报(自然科学版), 2022, 44(3): 522-532. doi: 10.7540/j.ynu.20210466
LI Yu-jiang, ZHANG Rong, WANG Qin, ZHANG Han-wen, LI Jing, WANG Fang, TU Li-hua, HAO Jian-feng. Effects of slope aspect and position on soil aggregates stability of shrub communities in Jiajin Mountains[J]. Journal of Yunnan University: Natural Sciences Edition, 2022, 44(3): 522-532. DOI: 10.7540/j.ynu.20210466
Citation: LI Yu-jiang, ZHANG Rong, WANG Qin, ZHANG Han-wen, LI Jing, WANG Fang, TU Li-hua, HAO Jian-feng. Effects of slope aspect and position on soil aggregates stability of shrub communities in Jiajin Mountains[J]. Journal of Yunnan University: Natural Sciences Edition, 2022, 44(3): 522-532. DOI: 10.7540/j.ynu.20210466

坡向和坡位对夹金山灌丛土壤团聚体稳定性的影响

Effects of slope aspect and position on soil aggregates stability of shrub communities in Jiajin Mountains

  • 摘要: 研究坡向和坡位如何影响土壤团聚体的稳定性,对于理解地貌复杂的高山峡谷地区土壤稳定性的维持具有重要意义,然而目前对高山灌丛土壤特征研究还相对薄弱,研究以四川夹金山高山灌丛土壤为研究对象,分析了不同坡向和坡位对土壤团聚体粒径分布、稳定性及分形特征的影响,构建偏最小二乘路径模型(Partial Least Squares Path Modeling,PLS-PM),分析坡向和坡位对土壤团聚体稳定性的作用机制. 结果表明:①土壤机械稳定性团聚体粒径分布仅受坡向影响,土壤水稳性团聚体粒径分布受坡向、坡位影响且二者存在交互作用;②中坡位土壤团聚体稳定性较优于下坡位,3个坡向中阴坡土壤稳定性最次;③坡向是影响土壤团聚体的主要因素,其作用主要是通过影响土壤物理性质(容重、含水率、孔隙度)而间接决定的,同时坡向通过影响群落灌木层特征(多度、丰度和生物量)作用于土壤化学性质(TN、TP、TK、SOM、pH),最终对土壤团聚体稳定性产生一定影响,坡向作用下的群落草本层特征并未显示出对土壤理化性质和团聚体稳定性的作用;④使用土壤分形维数表征团聚体稳定性具有可行性.

     

    Abstract: It is important to study how slope aspect and position affect the stability of soil aggregates for understanding the maintenance of soil stability in alpine and gorge region with complex geomorphology. However, the research on soil characteristics of alpine shrub is relatively scarce at present. In this paper, we studied the particle size distribution, stability, and fractal characteristics of soil aggregates of shrub communities in different slope aspects and positions in Jiajin Mountains, and we conducted a partial least square path model (PLS-PM) to analyze the function mechanism of slope aspect and position on soil aggregate stability. At the same time, the relationship between the fractal dimension and the stability of the aggregates was discussed. The results show that: ① The particle size distribution of mechanical stability of soil aggregates is only affected by the slope aspect, while the particle size distribution of soil water-stable aggregates is affected by the slope aspect, slope position and the interaction of the two. ② The stability of soil aggregates in the middle slope is better than that in the lower slope, and the stability of soil aggregates in the shady slope is the lowest among the three slope aspects. ③ Soil aggregates are mainly affected by the slope aspect, which is mainly determined indirectly by the effect of the slope aspect on soil physical properties (soil bulk density, moisture content, and porosity). Meanwhile, slope aspects have a certain effect on the stability of soil aggregates by influencing the characteristics of shrub communities (abundance, richness and biomass), and acting on soil chemical properties (TN, TP, TK, SOM, and pH). The characteristics of herb communities affected by slope aspect shows no effect on soil physicochemical properties and aggregate stability. ④ It is feasible to use soil fractal dimensions to characterize soil aggregate stability.

     

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