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ecosystem carbon storage and sink/source of temperate forested wetlands in Xiaoxing’anling, northeast China

Journal of Forestry Research 2022年第3期33卷 839-849页

作者： Biao Wang Changcheng Mu Huicui Lu Na Li Yan Zhang Li Ma Center for Ecological Research Northeast Forestry UniversityHarbin150040People’s Republic of China Faculty of Forestry Qingdao Agricultural UniversityQingdao266000People’s Republic of China

Wetlands play an important role in the global carbon cycle, but there are still considerable uncertainties in the estimation of wetland carbon storage and a dispute on whether wetlands are carbon sources or carbon sinks. Xiaoxing’anling are one of several concentrated distribution areas of forested wetland in China, but the carbon storage and carbon sink/source of forested wetlands in this area is unclear. We measured the ecosystem carbon storage (vegetation and soil), annual net carbon sequestration of vegetation and annual carbon emissions of soil heterotrophic respiration of five typical forested wetland types (alder swamp, white birch swamp, larch swamp, larch fen, and larch bog) distributed along a moisture gradient in this area in order to reveal the spatial variations of their carbon storage and quantitatively evaluate their position as carbon sink or source according to the net carbon balance of the ecosystems. The results show that the larch fen had high carbon storage (448.8 t ha^(−1)) (6.8% higher than the larch bog and 10.5–30.1% significantly higher than other three wetlands (P carbon storage ecosystems (406.3 and 420.1 t ha^(−1)) (12.4–21.8% significantly higher than the other two types (P carbon storage (345.0 and 361.5 t ha^(−1), respectively). The carbon pools of the five wetlands were dominated by their soil carbon pools (88.5–94.5%), and the vegetation carbon pool was secondary (5.5–11.5%). At the same time, their ecosystem net carbon balances were positive (0.1–0.6 t ha^(−1) a^(−1)) because the annual net carbon sequestration of vegetation (4.0–4.5 t ha^(−1) a^(−1)) were higher than the annual carbon emissions of soil heterotrophic respiration (CO_(2) and CH_(4)) (3.8–4.4 t ha^(−1) a^(−1)) in four wetlands, (the alder swamp being the exception), so all four were carbon sinks while only the alder swamp was a source of carbon emissio

关键词： Temperate forested wetlands ecosystem carbon storage carbon sink or source Xiaoxing’anling of China

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A review of modern treeline migration, the factors controlling it and the implications for carbon storage

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Journal of Mountain Science 2021年第2期18卷 291-306页

作者： HANSSON Amanda DARGUSCH Paul SHULMEISTER Jamie School of Earth and Environmental Science University of QueenslandBrisbane QLD 4072Australia School of Earth and Environment University of CanterburyChristchurch 8140New Zealand

Numerous studies have reported that treelines are moving to higher elevations and higher *** treelines are temperature limited and warmer climate expands the area in which trees are capable of ***,climate change has been assumed to be the main driver behind this treeline *** latest review of treeline studies was published in 2009 by Harsch et *** then,a plethora of papers have been published studying local treeline *** we bring together this knowledge through a review of 142 treeline related publications,including 477 study *** summarize the information known about factors limiting tree-growth at and near *** migration is not only dependent on favorable growing conditions but also requires seedling establishment and survival above the current *** conditions appear to have become favorable at many locations,particularly so in recent *** review revealed that at 66%of these treeline sites forest cover had increased in elevational or latitudinal *** physical form of treelines influences how likely they are to migrate and can be used as an indicator when predicting future treeline *** analysis also revealed that while a greater percentage of elevational treelines are moving,the latitudinal treelines are capable of moving at greater horizontal *** can potentially have substantial impacts on ecosystem carbon *** conclude the review,we present the three main hypotheses as to whether ecosystem carbon budgets will be reduced,increased or remain the same due to treeline *** the answer still remains under debate,we believe that all three hypotheses are likely to apply depending on the encroached ***,evidence is emerging on how treeline migration may turn tundra landscapes from net sinks to net sources of carbon dioxide in the future.

关键词： Treeline advance Treeline migration Forest dynamics Alpine forests ecosystem carbon storage carbon sequestration Global meta-analysis

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Changes in carbon storages of Fagus forest ecosystems along an elevational gradient on Mt. Fanjingshan in Southwest China

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Journal of Plant Ecology 2020年第2期13卷 139-149页

作者： Qiong Cai Chengjun Ji Xuli Zhou Helge Bruelheide Wenjing Fang Tianli Zheng Jiangling Zhu Lei Shi Haibo Li Jianxiao Zhu Jingyun Fang Department of Ecology College of Urban and Environmental Sciencesand Key Laboratory for Earth Surface Processes of the Ministry of EducationPeking University100871 BeijingChina Institute of Biology/Geobotany and Botanical Garden Martin Luther University Halle-WittenbergAm Kirchtor 106108 HalleGermany German Centre for Integrative Biodiversity Research(iDiv)Halle-Jena-Leipzig Deutscher Platz 5e04103 LeipzigGermany Administration Bureau of Guizhou Fanjingshan National Nature Reserve 554400 JiangkouChina

Aims There are different components of carbon(C)pools in a natural forest ecosystem:biomass,soil,litter and woody *** asked how these pools changed with elevation in one of China’s ecologically important forest ecosystem,***(Fagus L.,Fagaceae)forests,and what were the underlying driving factors of such *** The four C pools in nine beech forests were investigated along an elevational gradient(1095–1930 m)on *** in Guizhou Province,Southwest *** partitioning was used to explore the relative effects of stand age,climate and other factors on C *** addition,we compared the four C pools to other beech forests in Guizhou Province and *** Findings The total C pools of beech forest ecosystems ranged from 190.5 to 504.3 Mg C ha^(–1),mainly attributed to biomass C(accounting for 33.7–73.9%)and soil C(accounting for 23.9–65.5%).No more than 4%of ecosystem C pools were stored in woody debris(0.05–3.1%)and litter(0.2–0.7%).ecosystem C storage increased significantly with elevation,where both the biomass and woody debris C pools increased with elevation,while those of litter and soil exhibited no such *** the Guizhou beech forests,climate and stand age were found to be key drivers of the elevational patterns of ecosystem and biomass C storage,while for beech forests globally,stand age was the most important *** to beech forests worldwide,beech forests in Guizhou Province displayed a relatively higher biomass C accumulation rate,which may be explained by a much higher precipitation in this *** present study provides basic data for understanding the C budgets of Chinese beech forests and their possible roles in regional C cycling and emphasizes the general importance of stand age and climate on C accumulation.

关键词： carbon components climate ecosystem carbon storage elevational gradient Fagus forests stand age

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