亚热带崩岗侵蚀区不同植被恢复类型对土壤团聚体孔隙特征的影响
作者:
作者单位:

1.华中农业大学;2.长江水利委员会长江流域水土保持监测中心站;3.湖北省水利水电科学研究院;4.华中农业大学水土保持研究中心

基金项目:

国家自然科学基金项目(42177317)和湖北省水利重点科研项目(HBSLKY202304)资助


Effects of Different Types of Vegetation Restoration on Soil Pore Characteristics in Benggang Erosion Areas
Author:
Affiliation:

1.Research Center of Soil and Water Conservation,Huazhong Agricultural University;2.Yangtze Soil Conservation Monitoring Center,Changjiang Water Resources Commission;3.Hubei Water Resources and Hydropower Research Institute

Fund Project:

Supported by the National Natural Science Foundation of China(No. 42177317)and the Key Scientific Research Projects of Water Resources of Hubei Province(No.HBSLKY202304)

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    摘要:

    为探究亚热带崩岗侵蚀区不同植被恢复类型对土壤团聚体孔隙特征的影响,本研究采集4种植被恢复区土壤表层样品,包括人工乔木林、人工混交林、人工灌木林和人工草地,并以侵蚀劣地作为对照,采用能够提供团聚体内部信息的X射线显微计算机断层扫描(μCT)以5.91 μm分辨率量化3~5 mm团聚体孔隙特征,并结合土壤容重、团聚体粒径分布和机械组成等物理特性对土壤结构进行多尺度物理层次分析。结果表明,植被恢复显著促进了土壤团聚体的形成与稳定,孔隙特征呈现出较高的各向异性和分形维数。不同植被类型改善土壤的物理性质并增强其水分和养分保持能力,优化了土壤结构。孔径分布随植被类型不同而变化,反映了特定环境和管理措施的影响。基于土壤结构指数(Soil Structure Index,SSI)评估土壤结构质量,结果显示,除人工草地外,所有植被恢复区土壤的SSI值均高于侵蚀劣地:人工乔木林(0.66)>人工混交林(0.60)>人工灌木林(0.48)>侵蚀劣地(0.31)>人工草地(0.25),其中乔木林(尤其是柑橘林)在提升土壤结构和稳定性方面表现尤为显著。本研究显示了植被修复在崩岗地区生态恢复和土壤质量提升中的关键作用,不同植被类型对土壤团聚体孔隙特征的正向影响为土地管理和生态恢复提供了重要参考,未来研究可继续探讨不同恢复措施对土壤健康和水土保持的长期效果,从而为土地利用可持续和生态保护提供更为科学的支持。

    Abstract:

    【Objective】This study aimed to investigate the impact of different vegetation restoration types on soil pore characteristics in Benggang areas.【Method】Surface soil samples were collected from four vegetation-restored lands (artificial arbor, artificial forest, artificial shrubland, and artificial grassland) in the Benggang erosion area and an unplanted site was selected as the control (eroded land). The pore characteristics of the aggregates (3~5 mm) were visualized and quantified using X-ray microcomputed tomography (μCT) at a voxel resolution of 5.91 μm. Following the imaging, we measured various physical soil hierarchies, including bulk density, aggregate size distribution, and mechanical composition across multiple scales. 【Result】The results indicated that vegetation restoration significantly improved the formation and stability of soil aggregates, leading to notable changes in aggregate pore characteristics and characterized by high anisotropy and fractal dimension. This suggests that different vegetation types not only influence the physical properties of the soil but also enhance its ability to retain water and nutrients, thereby contributing to overall soil structure. The aggregate pore size distribution varied among the different revegetated sites, reflecting the influence of specific environmental conditions and management practices associated with each type of vegetation. The Soil Structure Index (SSI) was used to assess the overall quality of soil structure. The findings revealed that, except for artificial grassland, the SSI values were consistently higher for all vegetation-restored lands compared to the eroded land. The ranking of SSI values followed artificial arbor (0.66) > artificial forest (0.60) > artificial shrubland (0.48) > eroded land (0.31)> artificial grassland (0.25). This hierarchy underscores the significant benefits of arboreal woodlands, particularly citrus orchards, in enhancing soil structure and stability. 【Conclusion】Overall, the results of this study underscore the critical role of vegetation restoration in promoting ecological recovery and improving soil quality in the Benggang erosion areas of South China. By demonstrating the positive impacts of different vegetation types on soil aggregate pore characteristics, this research provides valuable insights for land management and ecological restoration efforts. Future studies could expand on these findings by exploring the long-term effects of various restoration practices on soil health and erosion control, thereby contributing to more effective strategies for sustainable land use and environmental conservation.

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王乾坤,张 歆,杨 伟,彭 珏,王军光.亚热带崩岗侵蚀区不同植被恢复类型对土壤团聚体孔隙特征的影响[J].土壤学报,DOI:10.11766/trxb202408270344,[待发表]
WANG Qiankun, ZHANG Xin, YANG Wei, PENG Jue, WANG Junguang. Effects of Different Types of Vegetation Restoration on Soil Pore Characteristics in Benggang Erosion Areas[J]. Acta Pedologica Sinica, DOI:10.11766/trxb202408270344,[In Press]

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  • 收稿日期:2024-08-27
  • 最后修改日期:2025-01-14
  • 录用日期:2025-02-13
  • 在线发布日期: 2025-02-13
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