Abstract
A series of complex organic fractions with different physical and chemical properties make up soil organic carbon (SOC), which plays a vital role in climate change and the global carbon cycle. Different SOC fractions have different stability and respond differently to vegetation succession. This research was carried out to assess the impacts of vegetation succession on SOC dynamics in the Qingmuguan karst valley area, southwest China. Soil samples were collected from four typical vegetation succession stages, including farmland, grassland, shrubland, and forest. The total SOC content and four oxidizable SOC fractions were measured. Results showed that the total SOC content and storage under farmland were highest, followed by forest and shrubland, and the grassland had the lowest total SOC content and storage. The SOC sequestration potential under different vegetation types in the study area was grassland (26.32 Mg C ha−1) > shrubland (9.64 Mg C ha−1). All SOC content, storage, and fractions showed a decrease with the increase of soil depth over the 0–50 cm in the study area. The four SOC fractions under forest at topsoil (0–10 cm) were higher than that under the other vegetation types. Compared with the other land uses, the farmland had the highest stable oxidizable SOC fractions (F3 and F4) at the 10–50-cm depth, while the shrubland had the highest active oxidizable SOC fractions (F1 and F2). In terms of the lability index of SOC, shrubland was the largest, followed by grassland and forest, and farmland was the smallest. These results provide essential information about SOC fractions and stability changes resulting from changes of vegetation types in a karst valley area of southwest China. It also supplements our understanding of soil carbon sequestration in vegetation succession.
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The software application used for statistical data analysis was SPSS 19.0 and Microsoft Excel 2019.
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This study was supported by the Special Project on National Science and Technology Basic Resources Investigation of China (2021FY100701); the National Natural Science Foundation of China (42171175); and the Fundamental Research Funds for the Central Universities in China (SWU-KT22009).
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Luo, Y., Li, Y., Liu, S. et al. Effects of vegetation succession on soil organic carbon fractions and stability in a karst valley area, Southwest China. Environ Monit Assess 194, 562 (2022). https://doi.org/10.1007/s10661-022-10254-x
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DOI: https://doi.org/10.1007/s10661-022-10254-x