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Short-Term Effects of Experimental Warming and Precipitation Manipulation on Soil Microbial Biomass C and N, Community Substrate Utilization Patterns and Community Composition

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Pedosphere 2017年第4期27卷 714-724页

作者： Guanlin LI Seongjun KIM Minji PARK Yowhan SON Department of Environmental Science and Ecological Engineering Graduate SchoolKorea UniversitySeoul 02841Korea Department of Biological and Environmental Sciences Qatar UniversityDoha 2713Qatar

Soil microorganisms are major drivers of soil carbon(C) cycling;however,the response of these microorganisms to climate change remains *** the present study,we investigated how 18 months of multifactor climate treatments(warmed air temperature by 3℃ and decreased or increased precipitation manipulation by 30%) affected soil microbial biomass C and nitrogen(N),community substrate utilization patterns,and community *** and increased precipitation significantly reduced microbial biomass C by 13.5% and 24.9% and microbial biomass N by 22.9% and 17.6% in unwarmed plots,respectively(Pabundance of the dominant bacterial and fungal groups by 0.5% to 6.8% and 4.3% to 10.7%,*** warming and/or precipitation manipulation treatments significantly altered Zygomycota abundance(P<0.05).Our results indicate that climate change drivers and their interactions may cause changes in soil microbial biomass C and N,community substrate utilization patterns,and community composition,particularly for the fungal community,and shifts in the microorganism community may further shape the ecosystems function.

关键词： bacterial community, climate change, community abundance, community diversity, community richness, fungal com-munity

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TOC changes in the process of thermal evolution of source rock and its controls

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Science China Earth Sciences 2004年第Z2期47卷 141-149页

作者： ZHONG Ningning1, LU Shuangfang2, HUANG Zhilong1, ZHANG Yousheng1, XUE Haitao2 & PAN Changchun3 1. The Key Lab of Petroleum Accumulation Mechanism of State Educational Ministry at University of Petroleum, Beijing 102249, China 2. Exploration Geoscience Department of Daqing Petroleum Institute, Daqing 163000, China 3. Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China The Key Lab of Petroleum Accumulation Mechanism of State Educational Ministry at University of Petroleum Beijing 102249 China Exploration Geoscience Department of Daqing Petroleum Institute Daqing 163000 China Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou 510640 China

Through geological observation, simulation in laboratory and numerical modeling, the factors that control the changes in total organic content (TOC) of source rock have been studied. When the formula DTOC=(TOC0-TOC)/TOC0 (original organic carbon content in the rock) is used to measure the TOC (total organic carbon content) changes in the source rock through geological time, the degrees and directions of such changes are determined by losses and relative amounts both of organic and inorganic matter in the source rock. The DTOC equa-tion, which is used to calculate the loss rate in the process of maturation for the source rock, is therefore obtained by analyzing the mass balance relations. For a certain type of source rock with a certain maturation history, the changes of its TOC respond only to the rates of hydrocarbon generation and expulsion. In actual cases of geological entities, DTOC generally ranges from -0.05 to 0.2, while the calculated reconversion coefficient (k) for organic carbon content remains between 0.90 and 1.25. Only in an ideal situation where there are extremely high rates of hydrocarbon generation and expulsion can the DTOC value experience significant changes, with k reaching up to 2.5. It is concluded, therefore, that the cri-terion for carbonates source rock assessment, based on reconverting the TOC to the value of its original state, may have overestimated the course of the carbon-reduction, which is likely in many cases to make a poor source rock sound better.

关键词： source rock appraisal, carbonates, low limit of organic matter abundance, rate of hydrocarbon generation and expulsion, TOC value.

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