Impacts of Vegetation Restoration on Soil Aggregates and Soil Organic Carbon on the Terrace Wall of Camellia Oleifera Orchard
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    Abstract:

    In order to study the relationship between terrace wall stability and vegetation succession, the terrace walls of different vegetation restoration years (2 years, 5 years, 10 years, and 30 years) and different vegetation restoration stages (bare land, moss, moss-grass, and moss-grass-shrub) were selected as the research objects, and soil samples of surface (0—5 cm) and subsurface (5—20 cm) were collected. The effects of restoration years and succession stages on soil aggregates and their organic carbon were analyzed. The results showed that the content of soil macroaggregates (>0.25 mm) increased with the increase of succession stage, and the proportion of macroaggregates was higher with the longer recovery years of the same succession stage, and the proportion of macroaggregates reached 91.63% in the 30 years moss-grass-scrub stage. Soil mean weight diameter (MWD) and geometric mean diameter (GMD) in 0—5 cm and 5—20 cm soil layers showed a gradual increasing trend with the increase of restoration time, with 30-year soil MWD and GMD ranging from 1.07 to 1.41 and 0.88 to 1.17 mm, respectively, and showing the characteristics of moss-grass-scrub > moss-grass > moss > bare land in different succession stages. Soil organic carbon content was significantly correlated with macroaggregates (r=0.83, p<0.001), indicating that vegetation succession and planting years had positive effects on soil carbon sequestration. Vegetation succession and vegetation recovery time can improve soil structure, stability and corrosion resistance of soil aggregates. The research results can provide theoretical reference for optimizing terrace development.

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History
  • Received:May 31,2023
  • Revised:
  • Adopted:
  • Online: December 27,2023
  • Published: December 28,2023