| 摘要: |
| 摘要:【目的】通过研究近自然恢复过程中马尾松人工林生态系统碳储量及其分配格局的变化特征，旨在阐明马尾松不同林龄生态系统碳汇机制以及固碳能力差异。【方法】基于样地调查，选用空间代替时间的方法，选取立地条件大致相似，以不同林龄6a, 19a, 32a, 58a生的马尾松(Pinus massoniana)人工林生态系统为研究对象，依据收获法和建立各器官生物量模型的方法估测生物量，采集0-60 cm土层土壤样品，测定生态系统各层次有机碳含量以此估算生态系统碳储量。【结果】不同林龄马尾松人工林其林下灌木层、凋落物层和根系有机碳含量均呈增加趋势，而草本层则相反，各组分有机碳含量整体表现为凋落物层＞灌木层＞草本层＞根系；其生态系统碳储量总体表现为增加趋势，过熟林显著提高了144.14%，其中，乔木层、凋落物层、根系和土壤层碳储量的变化规律与生态系统一致，而灌木层和草本层则相反；其植被层碳储量贡献率提升，而土壤层碳储量贡献率下降，凋落物层无明显变化；年净固碳量以幼龄林和中龄林较高，表明马尾松林固碳能力较强，具有相对较高的生物生产力水平。【结论】近自然恢复可进一步提升不同林龄马尾松林的碳固持能力，提高植被层生物量和土壤碳含量、增强土壤固碳能力、优化森林结构、维持较高生产力和降低人为干扰等可能为提高马尾松林生态系统碳汇功能的重要举措。 |
| 关键词: 生态系统 碳储量 分配格局 林龄 马尾松人工林 |
| DOI： |
| 投稿时间：2023-09-17修订日期：2024-03-04 |
| 基金项目:国家自然科学基金（32260387）；广西高校中青年教师科研基础能力提升项目（2022KY0701）；广西创新驱动发展专项课题（桂科AA17204087-7） |
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| Carbon Storage and Distribution Pattern of Pinus Massoniana Plantations Ecosystem in?Different?Forest?Ages?in?Guangxi |
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LI Yufeng1, MO Yanhua2, Qin Jiashuang3, MA Jiangming2
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| (1.Hezhou University，Guangxi Key Laboratory of Landscape Resources Conservation and Sustainable Utilization in Lijiang River Basin;2.Guangxi Key Laboratory of Landscape Resources Conservation and Sustainable Utilization in Lijiang River Basin, Guangxi Normal University;3.Guangxi Institute of Botany, Chinese Academy of Sciences) |
| Abstract: |
| Abstract:【Objective】This study aims to elucidate the carbon sequestration mechanisms and differences in carbon fixation capabilities of Pinus massoniana plantations across different ages by examining the changes in carbon storage and its distribution patterns during the near-natural recovery process. 【Method】Based on plot surveys and employing the space-for-time substitution method, P. massoniana plantations ecosystems of various ages (6, 19, 32, and 58 years) with roughly similar site conditions were selected as research subjects. Biomass was estimated using the harvest method and by establishing biomass models for each organ. Soil samples from the 0-60 cm layer were collected to determine the organic carbon content at different ecosystem levels, thereby estimating the ecosystem’s carbon storage. 【Result】The organic carbon content in the understory shrub layer, litter layer, and root system of P. massoniana plantations of different ages showed an increasing trend, while the herbaceous layer showed the opposite. The overall organic carbon content was in the order of litter layer > shrub layer > herbaceous layer > root system. The total carbon storage of the ecosystem generally showed an increasing trend, with over-mature forests significantly increasing by 144.14%. The changes in carbon storage in the arbor layer, litter layer, root system, and soil layer were consistent with the ecosystem, while the shrub layer and herbaceous layer were the opposite. The contribution rate of the vegetation layer to carbon storage increased, while that of the soil layer decreased, with no significant change in the litter layer. The annual net carbon fixation was higher in young and middle-aged forests, indicating that P. massoniana forests have strong carbon fixation capabilities and relatively high levels of biological productivity. 【Conclusion】Near-natural recovery can further enhance the carbon fixation capacity of P. massoniana forests of different ages, improve the biomass of the vegetation layer and soil carbon content, strengthen soil carbon fixation, optimize forest structure, maintain high productivity, and reduce human interference. These may be important measures to enhance the carbon sink function of P. massoniana forest ecosystems. |
| Key words: ecosystem carbon storage distribution pattern forest age P. massoniana plantations |
