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methane emissions during storage of different treatments from cattle manure in Tianjin

Journal of Environmental Sciences 2010年第10期22卷 1564-1569页

作者： Jiajun Wang Chiqing Duan Yaqin Ji Yichao Sun . College of Environmental Science and Engineering Nankai University Iianjin 300071 China. State Environmental Protection Key Laboratory of Urban Ambient Air Particulate Matter Pollution Prevention and Control Tianjin 300071 China Institute of Environment and Ecology Tianjin Academy of Environmental Sciences Tianjin 300191 China

Many studies on methane emissions from animal manure have revealed that animal manure is a major source of methane emissions to the atmosphere that can have negative consequences for people, animals and environment. In general, the release of methane can be influenced by the type of feed taken by animals, temperature, manure characteristics and so on. This study aimed at quantifying and comparing methane release from dairy manure with different piling treatments. Four treatments were designed including manure piling height 30, 45, 60 cm and adding 6 cm manure every day until the piling height was 60 cm. Static chamber method and gas chromatography were adopted to measure the methane emissions from April to June in 2009. methane emission rates of all four manure treatments were low in the first week and then increased sharply until reaching the peak values. Subsequently, all the methane emission rates decreased and fluctuated within the steady range till the end of the experiment. Wilcoxon nonparametfic tests analysis indicated that methane emission rate was greatly influenced by manure piling height and manner. There were no significant relationships between methane emission rates and the temperatures of ambience and heap. However, regression analysis showed that the quadratic equations were found between emission rates of all treatments and the gas temperature in the barrels.

关键词： dairy manure storage methane emissions different piling treatments

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NUMERICAL SIMULATION OF methane emissions FROM RICE PADDY FIELDS IN THE YANGTZE DELTA OF CHINA

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Acta meteorologica Sinica 2001年第1期15卷 1-11页

作者：刘建栋周秀骥张宇 Chinese Academy of Meteorological Sciences Beijing 100081

A numerical simulation model is presented in this paper,which comprises the processes of crop growth,soil organic carbon decomposition,and methane emissions in agroecosystems. Simulation results show that the model can simulate the main process of methane emissions well, and the correlation coefficient between the simulated values and observed data is 0.79 with 239 samples,which passed a significance test of *** average error of methane emission simulation in whole growth period is about 15%.Numerical analysis of the model indicates that the average temperature during rice growth period has much impacts on methane emissions,and the basic trend of interannual methane emissions is similar to that of average *** amount of methane emissions reduces about 34.93%,when the fertilizer is used instead of manure in single rice paddy.

关键词： numerical simulation methane emissions rice paddy fields the Yangtze Delta of China

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Slowdown in China's methane emission growth

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National Science Review 2024年第8期11卷 114-124页

作者： Min Zhao Xiangjun Tian Yilong Wang Xuhui Wang Philippe Ciais Zhe Jin Hongqin Zhang Tao Wang Jinzhi Ding Shilong Piao State Key Laboratory of Tibetan Plateau Earth System Resources and Environment(TPESRE) Institute of Tibetan Plateau Research Chinese Academy of Sciences University of Chinese Academy of Sciences Sino-French Institute for Earth System Science College of Urban and Environmental Sciences Peking University Laboratoire des Sciences du Climat et de l'Environnement LSCE/IPSLCEA-CNRS-UVSQUniversité Paris-Saclay Institute of Carbon Neutrality College of Urban and Environmental Sciences Peking University Institute of Atmospheric Physics Chinese Academy of Sciences

The unprecedented surge in global methane levels has raised global concerns in recent years,casting a spotlight on China as a pivotal *** has taken several actions to curb the methane emissions,but their effects remain ***,we developed the Global ObservatioN-based system for monitoring Greenhouse GAses for methane（GONGGA-CH4） and assimilate GO SAT XCH4observations to assess changes in China' s methane *** find the average rate of increase in China' s methane emissions(0.1±0.3 Tg CH4yr-2) during 2016-2021 slowed down compared to the preceding years（2011-2015）(0.9±0.5 Tg CH4yr-2),in contrast to the concurrent acceleration of global methane *** a result,the contribution of China to global methane emissions dropped ***,the slowdown of China' s methane emission is mainly attributable to a reduction in biogenic emissions from wetlands and agriculture,associated with the drying trend in South China and the transition from double-season to single-season rice cropping,while fossil fuel emissions are still *** results suggest that GONGGA-CH4provides the opportunity for independent assessment of China' s methane emissions from an atmospheric perspective,providing insights into the implementation of methane-related policies that align with its ambitious climate objectives.

关键词： methane emissions greenhouse gases data assimilation China Global ObservatioN-based system for monitoring Greenhouse GAses for methane

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Adsorption of methane on biochar for emission reduction in oil and gas fields

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Biochar 2023年第1期5卷 290-301页

作者： Vivien Yoonhee Ko Jinsheng Wang lan He David Ryan Xiaojie Zhang Christopher Lan Natural Resources Canada CanmetENERGY1 Haanel Dr.OttawaON K1A 1M1Canada FPInnovations 2665 East MallVancouverBC V6T 1Z4Canada Department of Chemical and Biological Engineering University of Ottawa161 Louis Pasteur StreetOttawaON K1N 6N5Canada

To contribute to the reduction of methane emissions,using low-cost biochar as adsorbents for capturing and storing methane in oil and gas fields is *** work presents results of methane adsorption on four biochars made from forestry wastes in comparison with the results of three commercial activated *** the adsorption capacity of the biochars is lower by over 50%than that of the activated carbons,thelow-cost and potential environmental benefits provide the incentive to the ***,it is shown that biochar can store more methane than vessels of compressed gas up to the pressure of 75 bar,suggesting the possibility of avoiding high-pressure gas compression and heavy vessels for cost savings in oil and gas *** thermodynamic and kinetic behaviors of the adsorption are studied and implications for the targeted application are discussed.

关键词： Biochar Adsorbent methane emissions Greenhouse gas reduction Adsorption behavior

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Acclimation of CH_(4)emissions from paddy soil to atmospheric CO_(2)enrichment in a growth chamber experiment

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The Crop Journal 2022年第1期10卷 140-146页

作者： Haoyu Qian Yaguo Jin Jin Chen Shan Huang Yunlong Liu Jun Zhang Aixing Deng Jianwen Zou Genxing Pan Yanfeng Ding Yu Jiang Kees Jan van Groenigen Weijian Zhang Institute of Crop Sciences Chinese Academy of Agricultural SciencesBeijing 100081China Jiangsu Key Laboratory of Low Carbon Agriculture and GHGs Mitigation College of Resources and Environmental SciencesNanjing Agricultural UniversityNanjing 210095JiangsuChina Soil and Fertilizer&Resources and Environmental Institute Jiangxi Academy of Agricultural ScienceNanchang 330200JiangxiChina Jiangxi Key Laboratory of Crop Physiology Ecology and Genetic BreedingJiangxi Agricultural UniversityNanchang 330045JiangxiChina Center of Agriculture and Climate Change Institute of ResourceEcosystem and Environment of AgricultureNanjing Agricultural UniversityNanjing 210095JiangsuChina Jiangsu Collaborative Innovation Center for Modern Crop Production/Key Laboratory of Crop Physiology and Ecology in Southern China Nanjing Agricultural UniversityNanjing 210095JiangsuChina Department of Geography College of Life and Environmental SciencesUniversity of ExeterExeter EX44RJUK

Elevated levels of atmospheric CO_(2)(eCO_(2))promote rice growth and increase methane(CH_(4))emissions from rice paddies,because increased input of plant photosynthate to soil stimulates methanogenic ***,temporal trends in the effects of eCO_(2)on rice growth and CH_(4)emissions are still *** investigate changes in the effects of eCO_(2)over time,we conducted a two-season pot experiment in a walk-in growth *** effects of eCO_(2)on rice leaf photosynthetic rate,biomass,and grain yield were similar between growing ***,the effects of eCO_(2)on CH_(4) emissions decreased over *** CO_(2)increased CH_(4)emissions by 48%-101%in the first growing season,but only by 28%-30%in the second growing *** also identified the microbial process underlying the acclimation of CH4 emissions to atmospheric CO_(2)enrichment:eCO_(2)stimulated the abundance of methanotrophs more strongly in soils that had been previously exposed to eCO_(2)than in soils that had not *** results emphasize the need for long-term eCO_(2)experiments for accurate predictions of terrestrial feedbacks.

关键词： Elevated CO_(2) methane emissions Rice Methanogens Methanotrophs

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Decadal methane Emission Trend Inferred from Proxy GOSAT XCH4 Retrievals:Impacts of Transport Model Spatial Resolution

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Advances in Atmospheric Sciences 2022年第8期39卷 1343-1359页

作者： Sihong ZHU Liang FENG Yi LIU Jing WANG Dongxu YANG Carbon Neutrality Research Center Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China National Centre for Earth Observation University of EdinburghEdinburghEH93FFUK University of Edinburgh EdinburghEH93FFUK University of Chinese Academy of Sciences Beijing 100049China

In recent studies,proxy XCH_(4)retrievals from the Japanese Greenhouse gases Observing SATellite(GOSAT)have been used to constrain top-down estimation of CH_(4)***,the resulting interannual variations often show significant discrepancies over some of the most important CH_(4)source regions,such as China and Tropical South America,by causes yet to be *** study compares monthly CH_(4)flux estimates from two parallel assimilations of GOSAT XCH_(4)retrievals from 2010 to 2019 based on the same Ensemble Kalman Filter(EnKF)framework but with the global chemistry transport model(GEOS-Chem v12.5)being run at two different spatial resolutions of 4°×5°(R4,lon×lat)and 2°×2.5°(R2,lon×lat)to investigate the effects of resolution-related model errors on the derived long-term global and regional CH_(4)emission *** found that the mean annual global methane emission for the 2010s is 573.04 Tg yr^(-1)for the inversion using the R4 model,which becomes about 4.4 Tg yr^(-1)less(568.63 Tg yr^(-1))when a finer R2 model is used,though both are well within the ensemble range of the 22 top-down results(2008-17)included in the current Global Carbon Project(from 550 Tg yr^(-1)to 594 Tg yr^(-1)).Compared to the R2 model,the inversion based on the R4 tends to overestimate tropical emissions(by 13.3 Tg yr^(-1)),which is accompanied by a general underestimation(by 8.9 Tg yr^(-1))in the *** a dipole reflects differences in tropical-mid-latitude air exchange in relation to the model’s convective and advective schemes at different *** two inversions show a rather consistent long-term CH_(4)emission trend at the global scale and over most of the continents,suggesting that the observed rapid increase in atmospheric methane can largely be attributed to the emission growth from North Africa(1.79 Tg yr^(-2)for R4 and 1.29 Tg yr^(-2)for R2)and South America Temperate(1.08 Tg yr^(-2)for R4 and 1.21 Tg yr^(-2)for R2)during the first half of the 2010s,an

关键词： methane emissions long-term trend horizontal resolution

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Long-term and combined effects of N-[2-(nitrooxy)ethyl]-3-pyridinecarboxamide and fumaric acid on methane production,rumen fermentation, and lactation performance in dairy goats

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Journal of Animal Science and Biotechnology 2022年第3期13卷 852-863页

作者： Zongjun Li Xinjian Lei Xiaoxu Chen Qingyan Yin Jing Shen Junhu Yao College of Animal Science and Technology Northwest A&F UniversityYangling 712100ShaanxiChina

Background:In recent years,nitrooxy compounds have been identified as promising inhibitors of methanogenesis in ***,when animals receive a nitrooxy compound,a high portion of the spared hydrogen is eructated as gas,which partly offsets the energy savings of *** objective of the present study was to evaluate the long-term and combined effects of supplementation with N-[2-(nitrooxy)ethyl]-3-pyridinecarboxamide(NPD),a methanogenesis inhibitor,and fumaric acid(FUM),a hydrogen sink,on enteric CH4production,rumen fermentation,bacterial populations,apparent nutrient digestibility,and lactation performance of dairy ***:Twenty-four primiparous dairy goats were used in a randomized complete block design with a 2×2factorial arrangement of treatments:supplementation without or with FUM(32 g/d)or NPD(0.5 g/d).All samples were collected every 3 weeks during a 12-week feeding *** FUM and NPD supplementation persistently inhibited CH4yield(L/kg DMI,by 18.8%and 18.1%,respectively)without negative influence on DMI or apparent nutrient *** supplemented in combination,no additive CH4suppression was *** showed greater responses in increasing the molar proportion of propionate when supplemented with NPD than supplemented alone(by 10.2%vs.4.4%).The rumen microbiota structure in the animals receiving FUM was different from that of the other animals,particularly changed the structure of phylum *** milk production and serum total antioxidant capacity were improved by NPD,but the contents of milk fat and protein were decreased,probably due to the bioactivity of absorbed NPD on body ***:Supplementing NPD and FUM in combination is a promising way to persistently inhibit CH4emissions with a higher rumen propionate ***,the side effects of this nitrooxy compound on animals and its residues in animal products need further evaluation before it can be used as an animal feed additiv

关键词： Bacterial populations Dairy goat Fumaric acid Lactation performance methane emissions N-[2-(nitrooxy)ethyl]-3-pyridinecarboxamide Rumen fermentation

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Multi-field Coupling Simulation of Impact of Temperature and Density of Heat Injection Well on Carbon Budget during Hydrate Exploitation in Qilian Mountain Permafrost Region

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Journal of Earth Science 2024年第6期35卷 1934-1943页

作者： Zhenhua Han Ruirui Li Luqing Zhang Jian Zhou Song Wang Key Laboratory of Shale Gas and Geoengineering Institute of Geology and GeophysicsChinese Academy of SciencesBeijing100029China Innovation Academy for Earth Science Chinese Academy of SciencesBeijing100029China Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education Beijing University of TechnologyBeijing100124China

Permafrost regions of Qilian Mountains in China are rich in gas hydrate *** greenhouse gases in deep frozen layer are released into the atmosphere during hydrate mining,a series of negative consequences *** study aims to evaluate the impact of hydrate thermal exploitation on regional permafrost and carbon budgets based on a multi-physical field coupling *** results indicate that the permeability of the frozen soil is anisotropic,and the low permeability frozen layer can seal the methane gas in the natural *** injection mining of hydrates causes the continuous melting of permafrost and the escape of methane gas,which transforms the regional permafrost from a carbon sink to a carbon source.A higher injection temperature concentrates the heat and causes uneven melting of the upper frozen layer,which provides a dominant channel for methane gas and results in increased methane ***,dense heat injection wells cause more uniform melting of the lower permafrost layer,and the melting zone does not extend to the upper low permeability formation,which cannot provide advantageous channels for methane ***,a reasonable and dense number of heat injection wells can reduce the risk of greenhouse gas emissions during hydrate exploitation.

关键词： permafrost gas hydrates carbon budget methane emissions greenhouse gases environmental effects multi-field coupling simulation

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methane Generation and Capture of ***

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Journal of Environmental Science and Engineering(A) 2021年第6期10卷 199-206页

作者： Nickolas J.Themelis A.C.(Thanos)Bourtsalas Earth Engineering Center Department of Earth and Environmental EngineeringColumbia UniversityNew YorkNY 10027USA

Analysis of the ***(Environmental Protection Agency)database of 2,549 MSW(Municipal Solid Waste)landfills showed that there were 1,164 operating landfills in which 348 million short tons(316 million metric tons)of waste were landfilled in *** total,these landfills occupy about 370 million square meters of land so it is not possible to monitor the generation of LFG(Landfill Gas)generation accurately,or collect most of the LFG *** study was based on the hypothesis that,on the average,methane generation is proportional to the tonnage of wastes landfilled *** Landfill methane Outreach Program of the EPA(EPA-LMOP)compiles annual operating data of all methane-capturing *** analysis of the 2018 data for 396 LMOP operating landfills showed that 210 million short tons of wastes were deposited and 5.06 million short tons of methane were captured,i.e.,an average capture of 0.024-ton CH4/ton *** the basis of the anaerobic reaction of the DOC(Degradable Organic Carbon)in landfilled wastes,the average rate of methane generation from all operating *** was estimated to be 0.05 ton of CH4 per ton of annual capacity;this number corresponds to bioreaction of about one half of the total organic carbon in *** this basis,the average rate of CH4 emission from the 396 LMOP landfills was estimated to be 0.026-ton CH4 per annual ton of deposition and the average efficiency of LFG capture,48%.Adding up all 1,164 operating landfills,their total emission of methane was estimated at 11.9 million metric tons of *** CH4/CO2 equivalence of 25,this number corresponds to CO2-eq emissions of 270 million metric tons,i.e.,5.1%of the *** related carbon dioxide emissions.

关键词： Wastes LFG methane generation methane capture methane emissions carbon dioxide emissions greenhouse gas emissions U.S.A.

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Nexus of Climate Change and USA Mid-South Rice (<i>Oryza sativa</i>L.) Production

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Journal of Geoscience and Environment Protection 2020年第12期8卷 211-231页

作者： Michael Aide Christian Torres De Guzman Department of Agriculture Southeast Missouri State University Cape Girardeau MO USA University of Arkansas Fayetteville AR USA

Climate change is manifesting across the USA Mid-South and is impacting agricultural productivity, including the production of rice. This manuscript is a review of pertinent global literature concerning the effect of increasing temperature and carbon dioxide concentrations involving: 1) rice growth and development with an emphasis on spikelet sterility, 2) water availability for irrigation with the specter of aquifer overdraft and emerging water management technologies intended to improve water use efficiency, 3) the soil-plant continuum related to greenhouse gas emission and research avenues supporting agronomic practices that limit these emissions, and 4) region wide assessment of the economic and agronomic indicators to infer changes in the agricultural infrastructure and markets. Based on the global literature review and specific circumstances for USA Mid-South rice production, explicit proposals to mitigate and alleviate climate change are proposed. Key climate change mitigation proposals include: 1) support irrigation technologies that limit water usage and reduce methane emissions, 2) support soil carbon enhancement and newly emerging soil health agronomic practices, 3) achieve a greater usage of remote sensing activities to detect, in real time, field stresses, 4) support rice breeding activities that benefit furrow irrigation and provide heat tolerance, and 5) coordinate a rice region wide consensus to achieve farm gate activities that address climate change.

关键词： Climate Change Rice methane emissions Furrow Irrigation Spikelet Sterility

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