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How Decomposition Affects the Molecular Diversity of Soil Organic Matter and Its Persistence
How Decomposition Affects the Molecular Diversity of Soil Organic Matter and Its Persisten...
How Decomposition Affects the Molecular Diversity of Soil Organic Matter and Its Persistence

Detailed Information

자료유형  
 학위논문 서양
최종처리일시  
20250211151945
ISBN  
9798384047957
DDC  
631.4
저자명  
Davenport, Rachelle Elizabeth.
서명/저자  
How Decomposition Affects the Molecular Diversity of Soil Organic Matter and Its Persistence
발행사항  
[Sl] : Cornell University, 2024
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2024
형태사항  
272 p
주기사항  
Source: Dissertations Abstracts International, Volume: 86-03, Section: B.
주기사항  
Advisor: Lehmann, Christopher.
학위논문주기  
Thesis (Ph.D.)--Cornell University, 2024.
초록/해제  
요약Organic matter is critical to how soil functions. It affects numerous biological, physical, and chemical processes in soil. It is not only a large reservoir of plant essential nutrients and minerals, but also a reservoir of organic carbon. The organic carbons compounds that make up this reservoir are highly diverse and numerous in their individual structures. My dissertation explores how the diversity of organic compounds in soil is impacted by ecosystem conditions, duration of decomposition, and microbial community structure. I use high resolution mass spectrometry to quantify dissolved organic matter molecular diversity in (i) different ecosystems, (ii) over time, and (iii) in response to variable microbial communities. To this end, I show that dissolved organic matter molecular diversity decreases over long periods of time and despite the overall decline in diversity, there are site-specific compounds that accumulate with depth in different ecosystems. Assessment of molecular diversity over shorter periods of time shows that microorganisms initially decrease the number of unique compounds in dissolved organic matter but increase the diversity of molecular properties at the same time. Finally, I conclude that the diversity of organic matter is influenced more by the metabolic potential of the decomposing microbial community rather than by differing plant litter inputs or microbial richness itself. How these changes in molecular diversity impact soil organic carbon persistence remains an important question for soil scientists to study further.
일반주제명  
Soil sciences
일반주제명  
Biogeochemistry
일반주제명  
Ecology
일반주제명  
Molecular chemistry
키워드  
Carbon persistence
키워드  
Molecular diversity
키워드  
Soil organic matter
키워드  
Decomposition
키워드  
Organic carbon
기타저자  
Cornell University Soil and Crop Sciences
기본자료저록  
Dissertations Abstracts International. 86-03B.
전자적 위치 및 접속  
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MARC

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■1001  ▼aDavenport,  Rachelle  Elizabeth.▼0(orcid)0000-0001-5712-3472
■24510▼aHow  Decomposition  Affects  the  Molecular  Diversity  of  Soil  Organic  Matter  and  Its  Persistence
■260    ▼a[Sl]▼bCornell  University▼c2024
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2024
■300    ▼a272  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  86-03,  Section:  B.
■500    ▼aAdvisor:  Lehmann,  Christopher.
■5021  ▼aThesis  (Ph.D.)--Cornell  University,  2024.
■520    ▼aOrganic  matter  is  critical  to  how  soil  functions.  It  affects  numerous  biological,  physical,  and  chemical  processes  in  soil.  It  is  not  only  a  large  reservoir  of  plant  essential  nutrients  and  minerals,  but  also  a  reservoir  of  organic  carbon.  The  organic  carbons  compounds  that  make  up  this  reservoir  are  highly  diverse  and  numerous  in  their  individual  structures.  My  dissertation  explores  how  the  diversity  of  organic  compounds  in  soil  is  impacted  by  ecosystem  conditions,  duration  of  decomposition,  and  microbial  community  structure.  I  use  high  resolution  mass  spectrometry  to  quantify  dissolved  organic  matter  molecular  diversity  in  (i)  different  ecosystems,  (ii)  over  time,  and  (iii)  in  response  to  variable  microbial  communities.  To  this  end,  I  show  that  dissolved  organic  matter  molecular  diversity  decreases  over  long  periods  of  time  and  despite  the  overall  decline  in  diversity,  there  are  site-specific  compounds  that  accumulate  with  depth  in  different  ecosystems.  Assessment  of  molecular  diversity  over  shorter  periods  of  time  shows  that  microorganisms  initially  decrease  the  number  of  unique  compounds  in  dissolved  organic  matter  but  increase  the  diversity  of  molecular  properties  at  the  same  time.  Finally,  I  conclude  that  the  diversity  of  organic  matter  is  influenced  more  by  the  metabolic  potential  of  the  decomposing  microbial  community  rather  than  by  differing  plant  litter  inputs  or  microbial  richness  itself.  How  these  changes  in  molecular  diversity  impact  soil  organic  carbon  persistence  remains  an  important  question  for  soil  scientists  to  study  further.
■590    ▼aSchool  code:  0058.
■650  4▼aSoil  sciences
■650  4▼aBiogeochemistry
■650  4▼aEcology
■650  4▼aMolecular  chemistry
■653    ▼aCarbon  persistence
■653    ▼aMolecular  diversity
■653    ▼aSoil  organic  matter
■653    ▼aDecomposition
■653    ▼aOrganic  carbon
■690    ▼a0481
■690    ▼a0425
■690    ▼a0431
■690    ▼a0329
■71020▼aCornell  University▼bSoil  and  Crop  Sciences.
■7730  ▼tDissertations  Abstracts  International▼g86-03B.
■790    ▼a0058
■791    ▼aPh.D.
■792    ▼a2024
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17162204▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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