Journal of Plant Ecology ›› 2023, Vol. 16 ›› Issue (3): 0-rtad001.DOI: 10.1093/jpe/rtad001

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  • 收稿日期:2022-07-03 修回日期:2022-11-12 接受日期:2023-01-05 出版日期:2023-06-01 发布日期:2023-01-11

Aboveground carbon sequestration rate in alpine forests on the eastern Tibetan Plateau: impacts of future forest management options

Yang Lin1,2, Jiang-Tao Xiao1,2,*, Yong-Ping Kou3,*, Jia-Xing Zu4, Xin-Ran Yu1,2, Yuan-Yuan Li1,2   

  1. 1Ministry of Education Key Laboratory of Land Resources Evaluation and Monitoring in Southwest China, Sichuan Normal University, Chengdu 610066, China;
    2School of Geography and Resource Science, Sichuan Normal University, Chengdu 610101, China;
    3CAS Key Laboratory of Mountain Ecological Restoration and Bioresource Utilization & Ecological Restoration and Biodiversity Conservation Key Laboratory of Sichuan Province, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu 610041, China;
    4Ministry of Education Key Laboratory of Environment Change and Resources Use in Beibu Gulf, Nanning Normal University, Nanning 530001, China

摘要: 青藏高原东部的高山森林是长江上游的重要生态屏障。然而,由于近几十年来持续的高强度采伐,大量的人工种植,以及完全的禁伐等措施,导致树木种类与年龄结构变得相对单一,生物多样性和生态功能都有所下降。为设计有效的森林管理方案,以优化森林结构,提高森林碳汇能力,本研究以四川茂县为研究地点,利用LANDIS-II模型对6种不同强度的森林管理方案(采伐、种植)进行测试,模拟和比较了这些方案与当前管理方案在未来100年间森林地上固碳速率的差异。研究结果表明:(i)与目前的管理方案相比,不同强度的采伐和种植明显改变了森林地上固碳速率;(ii)不同群落对管理方案的反应不同,不同的管理方案对寒温带针叶林和温带针叶林的地上固碳速率有显著的影响(P < 0.05),但对阔叶林影响较小;(iii)应综合物种、群落和景观3个层面全面考虑森林管理方案。这些结果说明,在研究地点实施较长的采伐和种植间隔(20年)可以最大限度地提高森林的地上固碳速率。该研究为评估森林管理方案在恢复森林生态和增加碳汇功能的能力,以及为在青藏高原东部地区选择有效的森林管理方案提供了重要参考。

关键词: 地上固碳速率, 物种与群落, 森林管理, 生态过程, 森林景观模型, 高山森林, 青藏高原

Abstract: Alpine forests in the eastern Tibetan Plateau are important ecological barriers in the upper reaches of the Yangtze River. However, due to continuous high-intensity harvesting, a large number of plantings, and the complete harvesting ban measures in recent decades, the forest tree species and age cohorts have become relatively homogenous, and the biodiversity and ecological functions have been reduced. To design effective forest management options to optimize forest structure and increase carbon sequestration capacity, Mao County in Sichuan Province was selected as the study site and six forest management options (harvesting, planting) of different intensities were tested using the LANDIS-II model to simulate and compare the differences in forest aboveground carbon sequestration rate (ACSR) between these options and the current management option over the next 100 years. Our results showed that (i) the different harvesting and planting intensities significantly changed the ACSR compared with the current management options; (ii) different communities responded differently to the management options, with the ACSR differing significantly in cold temperate conifers and temperate conifers but not in broad-leaved trees (P < 0.05); and (iii) a comprehensive consideration of forest management options at the species, community and landscape levels was necessary. Our results suggest that implementing a longer harvesting and planting interval (20 years) at the study site can maximize forest ACSR. This study provides an important reference for evaluating the ability of forest management options to restore forest ecological functions and increase carbon sequestration capacity and for selecting effective forest management programs in the eastern Tibetan Plateau.

Key words: aboveground carbon sequestration rate, species and community, forest management, ecological processes, forest landscape model, alpine forest, Tibetan Plateau