Xu Yaowen, Jiao Jiejie, Wu Chuping, Zhao Ziqing, Ge Xiaogai, Gao Ge, Cao Yonghui, Zhou Benzhi
Research Institute of Subtropical Forestry, Chinese Academy of Forestry, Hangzhou 311400, China.
Zhejiang Academy of Forestry, Hangzhou 310022, China.
Plants (Basel). 2024 Aug 19;13(16):2301. doi: 10.3390/plants13162301.
The important role of soil carbon pools in coping with climate change has become widely recognized. Moso bamboo () is an economically important bamboo species in South China; however, owing to factors such as rising labor costs and increasingly stringent environmental policies, Moso bamboo forests have recently been abandoned. The present study aimed to investigate the effects of abandonment on structural factors and soil organic carbon (SOC) stocks in Moso bamboo forests. We investigated Moso bamboo forests subjected to intensive management or abandonment for different durations and measured forest structural characteristics, mineral properties, soil nutrients, and other soil properties. Although abandonment did not significantly affect the height and diameter at breast height, it increased culm densities, biomass, and SOC stocks. The drivers of SOC stocks depended on soil depth and were mainly controlled by carbon decomposition mediated by soil properties. In the topsoil, mineral protection and soil total nitrogen (TN) exerted significant effects on SOC stocks; in the subsoil, soil TN was the main driver of SOC stocks. As the controlling factors of SOC stocks differed between the subsoil and topsoil, more attention should be paid to the subsoil. Overall, these findings refine our understanding of the structural characteristics and SOC stocks associated with Moso bamboo forest abandonment, serving as a reference for the follow-up management of these forests.
土壤碳库在应对气候变化中的重要作用已得到广泛认可。毛竹（）是中国南方一种具有重要经济价值的竹种；然而，由于劳动力成本上升和环境政策日益严格等因素，毛竹林最近被弃耕。本研究旨在调查弃耕对毛竹林结构因子和土壤有机碳（SOC）储量的影响。我们调查了经过不同时长集约经营或弃耕的毛竹林，并测量了森林结构特征、矿物性质、土壤养分和其他土壤性质。虽然弃耕对胸径和树高没有显著影响，但它增加了竹秆密度、生物量和SOC储量。SOC储量的驱动因素取决于土壤深度，主要受土壤性质介导的碳分解控制。在表层土壤中，矿物保护和土壤全氮（TN）对SOC储量有显著影响；在下层土壤中，土壤TN是SOC储量的主要驱动因素。由于下层土壤和表层土壤中SOC储量的控制因素不同，应更多关注下层土壤。总体而言，这些发现深化了我们对与毛竹林弃耕相关的结构特征和SOC储量的理解，为这些森林的后续管理提供了参考。
