Wang Yiru, Liu Zhaohua, Tang Tao, Li Jiping
Faculty of Forestry, Central South University of Forestry and Technology, Changsha 410004, China.
Key Laboratory of State Forestry Administration on Forest Resources Management and Monitoring in Southern Area, Changsha 410004, China.
Plants (Basel). 2023 Apr 12;12(8):1633. doi: 10.3390/plants12081633.
Forest stand structure (the characteristics and interrelationships of live trees) and site conditions (the physical and environmental characteristics of a specific location) have been linked to forest regeneration, nutrient cycling, wildlife habitat, and climate regulation. While the effects of stand structure (i.e., spatial and non-spatial) and site conditions on the single function of and () mixed forest have been studied in previous studies, the relative importance of stand structure and site conditions in terms of productivity, species diversity, and carbon sequestration remains unresolved. In this study, a structural equation model (SEM) was adopted to analyze the relative importance of stand structure and site conditions for the forest productivity, species diversity, and carbon sequestration of mixed forest in Jindong Forestry in Hunan Province. Our research demonstrates that site conditions have a greater influence on forest functions than stand structure, and that non-spatial structures have a greater overall impact on forest functions than spatial structures. Specifically, the intensity of the influence of site conditions and non-spatial structure on functions is greatest for productivity, followed by carbon sequestration and species diversity. In contrast, the intensity of the influence of spatial structure on functions is greatest for carbon sequestration, followed by species diversity and productivity. These findings provide valuable insights for the management of mixed forest in Jindong Forestry and have significant reference value for the close-to-natural forest management (CTNFM) of pure forests.
林分结构（活立木的特征及相互关系）和立地条件（特定地点的物理和环境特征）与森林更新、养分循环、野生动物栖息地及气候调节相关联。虽然以往研究已探讨了林分结构（即空间和非空间结构）和立地条件对杉木与马尾松（Cunninghamia lanceolata and Pinus massoniana）混交林单一功能的影响，但林分结构和立地条件在生产力、物种多样性及碳固存方面的相对重要性仍未明确。本研究采用结构方程模型（SEM）分析林分结构和立地条件对湖南省金洞林场杉木与马尾松混交林的森林生产力、物种多样性及碳固存的相对重要性。我们的研究表明，立地条件对森林功能的影响大于林分结构，且非空间结构对森林功能的总体影响大于空间结构。具体而言，立地条件和非空间结构对功能的影响强度在生产力方面最大，其次是碳固存和物种多样性。相比之下，空间结构对功能的影响强度在碳固存方面最大，其次是物种多样性和生产力。这些研究结果为金洞林场杉木与马尾松混交林的经营管理提供了有价值的见解，对纯杉木林的近自然森林经营（CTNFM）具有重要参考价值。
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