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<p>Forest plant productivity, as a key factor affecting plant carbon sequestration, is often used to reflect the tree growth and the magnitude of ecosystem functions, which can be affected by various factors, including individual competition, tree social status and biodiversity. To explore the impact of these factors on plant productivity, we randomly selected six forest types in Hunan province, including <i>Cunninghamia lanceolata</i> pure forest (CPF), <i>C. lanceolata</i> coniferous broad-leaved mixed forest (LMF), <i>Pinus massoniana</i> pure forest (MPF), <i>P. massoniana</i> coniferous broad-leaved mixed forest (MMF), <i>P. elliottii</i> pure forest (EPF) and <i>P. elliottii</i> coniferous broad-leaved mixed forest (EMF), where the pure forests were representative examples of plantations, while the mixed forests exemplified the main forest types of close-to-nature forest management. The results showed (1) there were significant differences in stand structure among different forest types, and the complexity of forest structure in mixed forest was generally higher than that in pure forest. (2) The competition distance varied depending on variations in stand structure. (3) The competition intensity was influenced by the composition of tree species and tree size, with larger trees demonstrating higher competitiveness. (4) The interaction between tree size and competition plays a crucial role in determining forest productivity, with tree size serving as a more powerful explanatory factor. In both mixed and pure forest, dominance and tree height were significant positively correlated with tree growth (<i>p</i> &lt; 0.001). The findings enhance our comprehension of the influence of stand structure and competition on productivity, and has a great significance for improving forest structure to improve forest quality and carbon sequestration capacity.</p>

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Effects of stand structure and individual competition intensity on plant productivity in typical subtropical forests of China

  • 期刊论文

  • 发表日期：

    2026年2月14日

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  • Shujuan Jiang,
  • Xiangwen Deng,
  • Zhihong Huang,
  • Wuping Xie,
  • Wenjing Zhu,
  • Wenhua Xiang,
  • Xiankai Lu

摘要

Forest plant productivity, as a key factor affecting plant carbon sequestration, is often used to reflect the tree growth and the magnitude of ecosystem functions, which can be affected by various factors, including individual competition, tree social status and biodiversity. To explore the impact of these factors on plant productivity, we randomly selected six forest types in Hunan province, including Cunninghamia lanceolata pure forest (CPF), C. lanceolata coniferous broad-leaved mixed forest (LMF), Pinus massoniana pure forest (MPF), P. massoniana coniferous broad-leaved mixed forest (MMF), P. elliottii pure forest (EPF) and P. elliottii coniferous broad-leaved mixed forest (EMF), where the pure forests were representative examples of plantations, while the mixed forests exemplified the main forest types of close-to-nature forest management. The results showed (1) there were significant differences in stand structure among different forest types, and the complexity of forest structure in mixed forest was generally higher than that in pure forest. (2) The competition distance varied depending on variations in stand structure. (3) The competition intensity was influenced by the composition of tree species and tree size, with larger trees demonstrating higher competitiveness. (4) The interaction between tree size and competition plays a crucial role in determining forest productivity, with tree size serving as a more powerful explanatory factor. In both mixed and pure forest, dominance and tree height were significant positively correlated with tree growth (p < 0.001). The findings enhance our comprehension of the influence of stand structure and competition on productivity, and has a great significance for improving forest structure to improve forest quality and carbon sequestration capacity.