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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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Multiscale analysis of fine slag from pulverized coal gasification in entrained-flow bed

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International Journal of Coal Science & Technology 2024年第1期11卷 119-132页

作者： Lirui Mao Mingdong Zheng Baoliang Xia Facun Jiao Tao Liu Yuanchun Zhang Shengtao Gao Hanxu Li School of Chemical Engineering Anhui University of Science and TechnologyHuainan232001China School of Earth and Environment Anhui University of Science and TechnologyHuainan232001China Insititute of Energy Hefei Comprehensive National Science CenterHefei230031China

Fine slag(FS)is an unavoidable by-product of coal ***,which is a simple heap of solid waste left in the open air,easily causes environmental pollution and has a low resource utilization rate,thereby restricting the development of energy-saving coal gasification *** multiscale analysis of FS performed in this study indicates typical grain size distribution,composition,crystalline structure,and chemical bonding *** FS primarily contained inorganic and carbon components(dry bases)and exhibited a"three-peak distribution"of the grain size and regular spheroidal as well as irregular *** irregular particles were mainly adsorbed onto the structure and had a dense distribution and multiple pores and *** carbon constituents were primarily amorphous in structure,with a certain degree of order and active sites.C 1s XPS spectrum indicated the presence of C–C and C–H bonds and numerous aromatic *** inorganic components,constituting 90%of the total sample,were primarily silicon,aluminum,iron,and *** inorganic components contained Si–O-Si,Si–O–Al,Si–O,SO_(4)^(2−),and Fe–O *** 2p XPS spectrum could be deconvoluted into Fe 2p_(1/2) and Fe 2p_(3/2) peaks and satellite peaks,while Fe existed mainly in the form of Fe(III).The findings of this study will be beneficial in resource utilization and formation mechanism of fine slag in future.

关键词： Coal gasification Fine slag Multiscale analysis carbon components Inorganic components

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