Xiao Shengyang,Zhang Lanyue,Chen Jingzhong,et al.Stability of Soil Aggregates and Its Influencing Factors at Different Elevations in Fanjing Mountain[J].Research of Soil and Water Conservation,2024,31(03):160-168.[doi:10.13869/j.cnki.rswc.2024.03.015]
梵净山不同海拔土壤团聚体稳定性及影响因素
- Title:
- Stability of Soil Aggregates and Its Influencing Factors at Different Elevations in Fanjing Mountain
- 文章编号:
- 1005-3409(2024)03-0160-09
- 分类号:
- S152.4
- 文献标志码:
- A
- 摘要:
- [目的]阐明土壤团聚体稳定性的海拔分布模式及其影响机制对评估山地自然生态系统生态功能稳定性至关重要。[方法]在梵净山900～2100 m海拔梯度下采集不同土层深度的土壤样品,借助干湿筛法和冗余分析(RDA)方法探讨了土壤环境因子与土壤团聚体稳定性的关系。[结果]在0—60 cm土层,土壤团聚体主要以>0.25 mm水稳性大团聚体为主,平均含量为86.78%; 在0—20 cm土层各海拔梯度差异显著,且中海拔1 500～1 800 m处显著高于1 800～2 100 m(p<0.05)。土壤团聚体MWD,GMD和D与海拔存在显著相关性,随海拔的升高土壤团聚体MWD和GMD均呈先升高后降低的单峰分布模式,在中海拔1 500～1 800 m处达到峰值; 且在0—10 cm和10—20 cm土层,1 500～1 800 m的MWD和GMD分别为5.03,3.64和4.79,3.52,显著高于900～1 200 m和1 800～2 100 m(p<0.05)。冗余分析显示,土壤团聚体稳定性沿海拔梯度变化主要受土壤SOC和pH值的影响,解释度分别为76.3%和1.3%,是影响土壤团聚体稳定性的主要环境因子。[结论]梵净山山地森林生态系统土壤团聚体稳定性沿海拔梯度具有明显差异,土壤化学性质是影响团聚体稳定性的重要因素。
- Abstract:
- [Objective] The aim of this study is to elucidate the altitude distribution pattern and its impact mechanism of soil aggregate stability, which is imperative for evaluating the stability of ecological functional in mountain ecosystems. [Methods] Soil samples were collected in different soil depths under the elevation gradient of 900～2 100 m in Fanjing Mountain. The relationship between soil environmental factors and the stability of soil aggregates were discussed by means of wet-dry screening and redundancy analysis(RDA). [Results] The content of macroaggregates(>0.25 mm)constituted the largest proportion(86.78%)of aggregate sizes across all elevations in mountain forest ecosystem in 0—60 cm soil layer. In 0—20 cm soil layer, the altitude gradient was significantly different, and the middle altitude 1 500～1 800 m was significantly higher than 1 800～2 100 m(p<0.05). There was a significant correlation between the MWD, GMD, and D of soil aggregates and altitude. As altitude increased, the MWD and GMD of soil aggregates showed a single peak distribution pattern of first increasing and then decreasing, reaching a peak at 1 500～1 800 m at mid altitude. In the 0—20 cm soil layer, the MWD and GMD of 1 500～1 800 m were 5.03, 3.64 and 4.79, 3.52, respectively, significantly higher than 900～1 200 m and 1 800～2 100 m(p<0.05). Redundancy analysis(RDA)showed that the stability of soil aggregates along the altitude gradient was mainly affected by soil organic carbon and pH, and the explanations for the stability of soil aggregates were 76.3% and 1.3%, respectively. [Conclusion] In the forest ecosystem of Fanjing Mountain, the stability of soil aggregates varies significantly along the elevation gradient, and soil chemical properties are important factors affecting the stability of aggregates.
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备注/Memo
收稿日期:2023-06-29 修回日期:2023-07-23
资助项目:贵州省科技计划项目(黔科合基础—ZK[2022]一般276,黔科合基础—ZK[2021]一般100,黔科合支撑[2023]一般048); 贵州科学院青年科学基金项目(黔科院J字[2023]13号)
第一作者:肖盛杨(1995—),男,贵州思南人,硕士,助理研究员,主要从事土壤物理与生态环境研究。E-mail:1269093654@qq.com
通信作者:谢元贵(1982—),男,四川达州人,博士,研究员,主要从事土地资源与生态学研究。E-mail:158701413@qq.com