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<p>To study the effects of different land use practices on soil humus fraction in karst mountainous areas of Guizhou to improve land use efficiency and the ecological environment in the region. Five soil layers (0–20&#xa0;cm, 20–40&#xa0;cm, 40–60&#xa0;cm, 60–80&#xa0;cm, 80–100&#xa0;cm) under five land use practices (farmland, abandoned land, shrub forest, middle-aged <i>Pinus massoniana</i> forest, and overripe <i>Pinus massoniana</i> forest) in karst mountainous areas in 2019 and 2020 were used for the study. The variations in humus-extractable carbon (HE),humic acid carbon (HA), fulvic acid carbon (FA), humin carbon (HM), and humification index (PQ) were analyzed. Results showed significant differences (<i>P</i> &lt; 0.001) in HE, HA, FA, and HM contents among land uses and soil layers. Surface soil (0–20&#xa0;cm) exhibited the highest HE content, while PQ values were universally below 1, indicating low humification. Principal component analysis revealed a positive correlation between HE and abandoned land and a negative correlation with overripe&#xa0;<i>Pinus massoniana</i>&#xa0;forest. Farmland showed high HE and HM content in surface soil but the lowest humification (PQ = 22.5%), whereas abandoned land exhibited the highest humification (PQ = 34%) due to natural vegetation recovery. This study systematically uncovers the regulatory mechanisms of land use on humus fractions in karst ecosystems, providing a scientific basis for optimizing land management and enhancing carbon sequestration.</p>

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Effects of different land use on humus fractions in a karst region of China

  • 期刊论文

  • 发表日期：

    2025年7月14日

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  • Y. Wang,
  • P. He,
  • K. Yang,
  • B. Ding,
  • Y. Ren,
  • Z. Zhang

摘要

To study the effects of different land use practices on soil humus fraction in karst mountainous areas of Guizhou to improve land use efficiency and the ecological environment in the region. Five soil layers (0–20 cm, 20–40 cm, 40–60 cm, 60–80 cm, 80–100 cm) under five land use practices (farmland, abandoned land, shrub forest, middle-aged Pinus massoniana forest, and overripe Pinus massoniana forest) in karst mountainous areas in 2019 and 2020 were used for the study. The variations in humus-extractable carbon (HE),humic acid carbon (HA), fulvic acid carbon (FA), humin carbon (HM), and humification index (PQ) were analyzed. Results showed significant differences (P < 0.001) in HE, HA, FA, and HM contents among land uses and soil layers. Surface soil (0–20 cm) exhibited the highest HE content, while PQ values were universally below 1, indicating low humification. Principal component analysis revealed a positive correlation between HE and abandoned land and a negative correlation with overripe Pinus massoniana forest. Farmland showed high HE and HM content in surface soil but the lowest humification (PQ = 22.5%), whereas abandoned land exhibited the highest humification (PQ = 34%) due to natural vegetation recovery. This study systematically uncovers the regulatory mechanisms of land use on humus fractions in karst ecosystems, providing a scientific basis for optimizing land management and enhancing carbon sequestration.