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논문 기본 정보

자료유형
학술대회자료
저자정보
(Chinese Academy of Sciences) (Chinese Academy of Sciences) (Chinese Academy of Sciences) (National Field Research Station of Shenyang Agricultural Ecosystems, China)
저널정보
한국토양비료학회 한국토양비료학회 학술발표회 초록집 20th WORLD CONGRESS OF SOIL SCIENCE
발행연도
수록면
358 - 358 (1page)

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초록· 키워드

We know well that the turnover and dynamics of soil organic matter (SOM) is mainly driven by microorganisms, but we know little about how and to what extent the microbial processes of exogenous substrate transformation mediate carbon (C) and nitrogen (N) cycling in soil system. The mediation of exogenous substrates on soil microbial processes cannot be well deduced from microbial biomass measurements or microbial community evaluation alone due to its vulnerability to environmental regime change, but microbial metabolism feature and legacy (residue) such as amino acids and amino sugars can provide an integrated view of microbial roles and functions linked to soil C and N transformation and dynamics. However, a big challenge or a pivotal knowledge gap for the understanding of the underlying mechanisms is how to interpret the microbial metabolisms of both added substrate and soil native C and N, and moreover, a crucial technical limitation is how to differentiate the newly microbial-derived legacy (residue) from the soil native portions with the same components. In this context, we established a set of isotope-based gas/liquid chromatograph-mass spectrometry techniques, and applied the novel techniques to investigate the biochemical processes of C and N transformation and dynamics in soil systems as affected by substrate input. The key approach is differentiating between the newly microbial-derived amino sugar and amino acid legacies (residues) and the same soil intrinsic components (molecules). Our hypothesis is that microbial metabolism and new microbial legacy would mediate soil C and N cycling. Our results showed that extraneous organic C (13C labeled) and inorganic N (15N labeled) were rapidly immobilized by microorganisms and a large portion was incorporated into soil amino acids and amino sugars fractions as m ... 전체 초록 보기
#microbial process #microbial legacy (residue) #metabolism #soil organic carbon and nitrogen #substra
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