Effects of landscape fragmentation of plantation forests on carbon storage in the Loess Plateau, China

IF 2.7 3区 环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES
Hangyu Lei, Dantong Duan, Yi Chen, Huifeng Guo, Jiangtao Li, Xiang Li
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Abstract

Tree plantation and forest restoration are the major strategies for enhancing terrestrial carbon sequestration and mitigating climate change. The Grain for Green Project in China has positively impacted global carbon sequestration and the trend towards fragmentation of plantation forests. Limited studies have been conducted on changes in plantation biomass and stand structure caused by fragmentation, and the effect of fragmentation on the carbon storage of plantation forests remains unclear. This study evaluated the differences between carbon storage and stand structure in black locust forests in fragmented and continuous landscape in the Ansai District, China and discussed the effects of ecological significance of four landscape indices on carbon storage and tree density. We used structural equation modelling to explore the direct and indirect effects of fragmentation, edge, abiotic factors, and stand structure on above-ground carbon storage. Diameter at breast height (DBH) in fragmented forests was 53.3% thicker, tree density was 40.9% lower, and carbon storage was 49.8% higher than those in continuous forests; for all given DBH>10 cm, the trees in fragmented forests were shorter than those in continuous forests. The patch area had a negative impact on carbon storage, i.e., the higher the degree of fragmentation, the lower the density of the tree; and fragmentation and distance to edge (DTE) directly increased canopy coverage. However, canopy coverage directly decreased carbon storage, and fragmentation directly increased carbon storage and tree density. In non-commercial forests, fragmentation reduces the carbon storage potential of plantation, and the influence of patch area, edge, and patchy connection on plantation should be considered when follow-up trees are planted and for the plantation management. Thus, expanding the area of plantation patches, repairing the edges of complex-shaped patches, enhancing the connectivity of similar patches, and applying nutrients to plantation forests at regular intervals are recommended in fragmented areas of the Loess Plateau.

人工林景观破碎化对中国黄土高原碳储存的影响
植树造林和森林恢复是加强陆地碳固存和减缓气候变化的主要战略。中国的 "绿色粮食计划 "对全球碳固存和人工林破碎化趋势产生了积极影响。目前,关于破碎化引起的人工林生物量和林分结构变化的研究有限,破碎化对人工林碳储量的影响仍不清楚。本研究评估了中国安塞区破碎景观与连续景观下黑刺槐林碳储量和林分结构的差异,探讨了四种景观指数的生态学意义对碳储量和林木密度的影响。我们采用结构方程模型探讨了破碎化、边缘、非生物因素和林分结构对地上碳储量的直接和间接影响。与连续森林相比,破碎森林的胸径(DBH)粗53.3%,树木密度低40.9%,碳储量高49.8%;在所有给定的DBH>10 cm条件下,破碎森林的树木比连续森林的树木短。斑块面积对碳储量有负面影响,即破碎度越高,树木密度越低;破碎度和边缘距离(DTE)直接增加了冠层覆盖率。然而,树冠覆盖率直接降低了碳储量,而破碎度直接增加了碳储量和树木密度。在非商品林中,破碎化会降低人工林的碳储存潜力,因此在后续植树和人工林管理中应考虑斑块面积、边缘和斑块连接对人工林的影响。因此,建议在黄土高原破碎化地区扩大人工林斑块的面积,修复形状复杂的斑块边缘,加强相似斑块的连通性,并定期为人工林施用养分。
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来源期刊
Journal of Arid Land
Journal of Arid Land ENVIRONMENTAL SCIENCES-
CiteScore
4.70
自引率
6.70%
发文量
768
审稿时长
3.2 months
期刊介绍: The Journal of Arid Land is an international peer-reviewed journal co-sponsored by Xinjiang Institute of Ecology and Geography, the Chinese Academy of Sciences and Science Press. It aims to meet the needs of researchers, students and practitioners in sustainable development and eco-environmental management, focusing on the arid and semi-arid lands in Central Asia and the world at large. The Journal covers such topics as the dynamics of natural resources (including water, soil and land, organism and climate), the security and sustainable development of natural resources, and the environment and the ecology in arid and semi-arid lands, especially in Central Asia. Coverage also includes interactions between the atmosphere, hydrosphere, biosphere, and lithosphere, and the relationship between these natural processes and human activities. Also discussed are patterns of geography, ecology and environment; ecological improvement and environmental protection; and regional responses and feedback mechanisms to global change. The Journal of Arid Land also presents reviews, brief communications, trends and book reviews of work on these topics.
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