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Synergistic Effects of Nitrogen Amendments and Ethylene on Atmospheric methane uptake under a Temperate Old-growth Forest

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Advances in Atmospheric Sciences 2011年第4期28卷 843-854页

作者：徐星凯韩琳罗献宝韩士杰 State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry Institute of Atmospheric PhysicsChinese Academy of Sciences Graduate University of Chinese Academy of Sciences Institute of Applied Ecology Chinese Academy of Sciences

An increase in atmospheric nitrogen （N） deposition can promote soil acidification, which may increase the release of ethylene （C2H4） under forest floors. Unfortunately, knowledge of whether increasing N deposition and C2H4 releases have synergistic effects on soil methane （CH4） uptake is limited and certainly deserves to be examined. We conducted some field measurements and laboratory experiments to examine this issue. The addition of （NH4）2SO4 or NH4Cl at a rate of 45 kg N ha-1 yr-1 reduced the soil CH4 uptake under a temperate old-growth forest in northeast China, and there were synergistic effects of N amendments in the presence of C2H4 concentrations equal to atmospheric CH4 concentration on the soil CH4 uptake, particularly in the NH4Cl-treated plots. Effective concentrations of added C2H4 on the soil CH4 uptake were smaller in NH＋4 -treated plots than in KNO3-treated plots. The concentration of ca 0.3 μl C2H4 L-1 in the headspace gases reduced by 20% soil atmospheric CH4 uptake in the NH4Cl-treated plots, and this concentration was easily produced in temperate forest topsoils under short-term anoxic conditions. Together with short-term stimulating effects of N amendments and soil acidification on C2H4 production from forest soils, our observations suggest that knowledge of synergistic effects of NH＋4 , rather than NO3- , amendments and C2H4 on the in situ soil CH4 uptake is critical for understanding the role of atmospheric N deposition and cycling of C2H4 under forest floors in reducing global atmospheric CH4 uptake by forests. Synergistic functions of NH4＋ -N deposition and C2H4 release due to soil acidification in reducing atmospheric CH4 uptake by forests are discussed.

关键词： methane uptake ethylene nitrogen amendment synergistic effect forest

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Temperate northern hemisphere dominates the global soil CH_(4) sink

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Journal of Mountain Science 2022年第11期19卷 3051-3062页

作者： XU Xin WEI Da QI Ya-hui WANG Xiao-dan Institute of Mountain Hazards and Environment Chinese Academy of SciencesChengdu 610041China University of Chinese Academy of Sciences Beijing 100049China

methane(CH_(4)) is the second largest longlived greenhouse gas after the CO_(2), which contributes 20% of global warming forcing. Global aerated soils remove CH_(4) from the troposphere, but the quantification of its magnitude and spatial variability is still of a large uncertainty. This study collected 1240records of the CH_(4) uptake by soils across the *** estimates update the global soil CH_(4) sink to 31.9+/-0.16 Tg CH_(4) a^(-1), 42% higher than the previous inventory-based estimation, with 56% from temperate regions. Also, our dataset revealed that the global drylands dominated the soil CH_(4) sink, which is different from traditional forest-dominated *** the past four decades, the soil porosity affected by soil moisture controls the variation in the uptake in the tropics, while warming temperatures benefit methanotrophs in temperate and boreal soils,especially the drylands, where the soil porosity is not limiting. Our simulations indicate that the CH_(4) uptake will increase by 11%–31% by the end of the 21st century, much lower than the previous *** study substantially constrains the global soil CH_(4) sink estimates and reveals the warming temperate northern hemisphere is a dominant CH_(4) uptake region in the past and future, while the uptake decreases in tropical soils under increasing precipitation.

关键词： Climate change methane uptake Northern hemisphere Observations Simulations

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Stabilizing the Extrinsic Porosity in Metal-Organic Cages-Based Supramolecular Framework by In Situ Catalytic Polymerization

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CCS Chemistry 2021年第5期3卷 1382-1390页

作者： Guoliang Liu Mi Zhou Kongzhao Su Ravichandar Babarao Daqiang Yuan Maochun Hong State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002 University of the Chinese Academy of Sciences Beijing 100049 Commonwealth Scientific and Industrial Research Organization(CSIRO)Manufacturing MelbourneVIC 3169 School of Science RMIT UniversityMelbourneVIC 3001

Porous supramolecular frameworks based on metal-organic cages(MOCs)usually have poor structural stability after *** issue narrows the scope of their potential applications,particularly for the inclusion of guest molecules that demand high ***,the authors have reported the stabilization of a mesoporous zirconium MOC-based supramolecular framework with an in situ catalytic polymerization *** to the passivation effect imparted by this strategy,the introduced polymer is primarily distributed on the surface of the crystals,which results in the hybrid material retaining its crystallinity and permanent porosity.A preliminary application of this type of stabilized mesoporous supramolecular framework shows that among MOC-based supramolecular frameworks,it has the highest high-pressure methane *** a facile strategy may provide a general way to stabilize fragile porous materials and facilitate exploration of their potential applications.

关键词： in situ catalytic polymerization metal-organic cages supramolecular frameworks framework stabilization methane uptake

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Tuning the Structure of Fe-Tetracarboxylate Frameworks Through Linker-Symmetry Reduction

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CCS Chemistry 2021年第2期3卷 1701-1709页

作者： Jiandong Pang Christina T.Lollar Sai Che Jun-Sheng Qin Jialuo Li Peiyu Cai Mingyan Wu Daqiang Yuan Maochun Hong Hong-Cai Zhou Department of Chemistry Texas A&M UniversityCollege StationTX 77843-3255 State Key Laboratory of Structure Chemistry Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhouFujian 350002 State Key Laboratory of Inorganic Synthesis and Preparative Chemistry College of ChemistryInternational Center of Future ScienceJilin UniversityChangchun 130012 University of Chinese Academy of Sciences Beijing 100049

The design and synthesis of stable metal–organic frameworks(MOFs)have been a core obstacle in the widespread application of these functional crystalline porous materials,because of the stability limitations of MOFs under harsh operating ***,a highly stable microporous MOF based on the Fe_(3)O cluster(PCN-678)has been synthesized using a tetracarboxylate *** symmetry reduced tetratopic carboxylate ligand,a mesoporous MOF(PCN-668)could be obtained in which nanoscale cage-like building units and one-dimensional(1D)channels *** neighboring cages were mutual diastereomers in PCN-668 due to the further reduction of the Cs symmetry of the free ligand to C1 symmetry after ***,the acid stability of this mesoporous MOF was improved via postsynthetic metal exchange to chromium(PCN-668-Cr).The PCN-668-Cr exhibited very high stability in both acidic and basic aqueous solutions(pH=1–11).Additionally,the mesoporous MOF showed a high total gravimetric methane uptake(∼500 cm^(3) g^(−1) at 100 bar),while the microporous MOF showed a high volumetric methane storage capacity of 147 cm3 cm−3 at room temperature.

关键词： metal–organic framework mesoporous,highly stable diastereomeric cage methane uptake

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