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Divergent responses of Picea crassifolia *** different forest patches to climate change in the northeastern Tibetan Plateau

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forest Ecosystems 2023年第6期10卷 752-762页

作者： Zhongtong Peng Qifeng Mo Liangjun Zhu Qingao Lu Jiaqing Cai Mingming Guo Kun Xu Yuandong Zhang Key Laboratory of forest Ecology and Environment of National forestry and Grassland Administration Ecology and Nature Conservation InstituteChinese Academy of ForestryBeijing100091China Guangdong Key Laboratory for Innovative Development and Utilization of forest Plant Germplasm College of Forestry and Landscape ArchitectureSouth China Agricultural UniversityGuangzhou510642China National Engineering Laboratory for Applied Technology of forestry&Ecology in South China College of Life Science and TechnologyCentral South University of Forestry and TechnologyChangsha410004China Swiss Federal Institute for forest Snow and Landscape Research WSLBirmensdorf8903Switzerland Environment and Sustainability Institute University of ExeterPenryn CampusPenrynCornwallTR109FEUK College of forestry Hebei Agricultural UniversityBaoding071000China

Global climate changes have significantly affected tree growth and forest structures and functions in some arid and semi-arid regions,which are becoming warmer and *** to natural factors such as climate and terrain,some tree species may form different forest patches at the edges of their distribution ***,how forest patches of various sizes respond to climate change is *** this study,we collected 203 tree cores from six different sizes of forest patches at the edge of the distribution area of Picea crassifolia *** the northeast Tibetan *** we used the dendrochronology method to study the response of tree growth and resilience in different forest patches to climate change from 1961 to *** simultaneously measured the contents of nonstructural carbohydrates(NSC),total nitrogen and total phosphorus of tree *** results showed that the growth of trees in small-and medium-size forest patches(0.8–18.6 ha)has increased *** early growing season(May–July)minimum temperature was the most important climate factor driving the growth of small-and medium-sized patch *** early growing season maximum temperature was the most important climate factor that inhibited the growth of trees in the largest patches(362.8 ha).The growth of individual trees in medium forest patches was better and the correlation with annual minimum temperature,maximum temperature,precipitation,actual evapotranspiration,and palmer drought severity index was *** higher NSC content,stronger photosynthesis,and higher nitrogen utilization efficiency in leaves might be one of the reasons for the better growth of trees in moderate forest *** extreme drought years,as the forest patch area increased,the overall trend of tree growth resistance showed a unimodal pattern,with the highest at a forest patch area of 7.1 ha,while the overall trend of tree growth recovery was ***,we should strengthen the management of trees in large

关键词： Climate change Picea crassifolia Kom forest patches Tree growth Resilience

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Flora, Structure and Carbon Sequestration of Vegetation in the Southeast of the Mono Biosphere Reserve in Togo Amidst Environmental Challenges

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Open Journal of forestry 2024年第2期14卷 155-181页

作者： Gbétey Kokouvi Akpamou Kossi Adjossou Hodabalo Egbelou Komlanvi Katche Akoete Kossi Hounkpati Kouami Kokou Faculty of Science-forest Research Laboratory (FRL) University of Lome Lome Togo Ministry of the Environment and forest Resources Lom&#233 Togo National Agricultural Training Institute (INFA) of Tove Kpalime Togo

In most Sub-Saharan African countries such as Togo, people’s heavy dependence on ecosystem services is a major factor in accelerating the degradation of natural resources, which are already suffering as a result of climatic factors. This study was initiated to contribute to the sustainable and rational management of forest resources in the south-east of the Mono Biosphere Reserve in Togo. It specifically aims to identify and characterize the flora of the residual forest ecosystems within the reserve through their specific diversity, demographic structure, and carbon sequestration potential. The study was carried out in the forest ecosystems of Avévé. The methodology used was based on the analysis of phytosociological, forestry, ecological, and regeneration inventory data. Overall, the study revealed that the RBMT still has floristically viable habitats, despite the anthropogenic pressures it is subject to revealed a floristic diversity of 160 plant species divided into 52 families and 135 genera. The most represented families are Rubiaceae (29.09%), followed by Fabaceae (27.94%). The most represented species are Mitragyna inermis (Willd.) Kuntze (24.38%), Lecaniodiscus cupanioides Planch. Ex Benth (X) and Lonchocarpus sericeus (Poir.) Kunth (10.93%). The high presence of Mitragyna inermis observed in all the ecological groups identified makes it the characteristic species of the flooded marshy areas of southeast Togo and contributes to the resilience of the ecosystems and populations in the study area. The Shannon index for the formation groups varies between (3.03 and 5.16) bits. Pielou’s equitability varies between (0.43 and 0.63) bits. The overall average density is estimated at 210 stems/ha, with an average diameter of 25.57 ± 21.77 m and an average height of 7.93 ± 3.83 m. The adjustment of the diameter classes of the plant groups to the Weibull distribution gave an “inverted J” shape with coefficient values of less than 1 overall, reflecting the existence of m

关键词： Biodiversity Demographic Structure Carbon Biosphere Reserve forest patches Togo

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