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Using Isotopes to Explore Global Peat Carbon Dynamics
Using Isotopes to Explore Global Peat Carbon Dynamics
Using Isotopes to Explore Global Peat Carbon Dynamics

상세정보

자료유형  
 학위논문 서양
최종처리일시  
20250211153123
ISBN  
9798346855446
DDC  
551
저자명  
Hedgpeth, Alexandra.
서명/저자  
Using Isotopes to Explore Global Peat Carbon Dynamics
발행사항  
[Sl] : University of California, Los Angeles, 2024
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2024
형태사항  
178 p
주기사항  
Source: Dissertations Abstracts International, Volume: 86-06, Section: A.
주기사항  
Advisor: Cavanaugh, Kyle C.
학위논문주기  
Thesis (Ph.D.)--University of California, Los Angeles, 2024.
초록/해제  
요약This dissertation investigates the role of peatlands as critical carbon (C) reservoirs that sequester approximately 600 gigatons of C globally, effectively acting as a significant buffer against climate change. Despite their limited geographic extent-covering only 3% of the Earth's surface-peatlands store nearly twice the C of all global forests combined. This exceptional C storage potential is largely due to the waterlogged, anoxic conditions in these ecosystems that inhibit microbial decomposition and allow organic matter to accumulate over millennia. However, peatlands are highly vulnerable to both natural and anthropogenic pressures, including climate change, land-use modifications, and direct human disturbances, all of which threaten their capacity to serve as long-term C sinks. This dissertation leverages isotopic analysis to examine peatland C dynamics across diverse regions and contexts by exploring the mechanisms driving C dynamics in tropical, boreal, and temperate peatlands, focusing on both surface-derived and deep peat C emissions and accumulation. Tropical peatlands, which differ from boreal and temperate peatlands due to consistently warm temperatures and seasonal rainfall, contain highly dense C deposits but are also at heightened risk of C release under changing rainfall patterns. One case study examines tropical peatlands in Central America, where consistently warm temperatures and seasonal rainfall create dense C deposits. These tropical systems are especially susceptible to C loss with changing rainfall patterns, potentially releasing stored C from deep peat layers. In boreal regions, experimental warming simulates future climate conditions, assessing how elevated temperatures and CO₂ concentrations affect C storage across peat depths. Additionally, this dissertation uses global radiocarbon data to analyze peat accumulation and stability across climates, providing insights into regional differences in peatland resilience under environmental changes. These studies together highlight the significant impact of environmental variables such as precipitation, temperature, and proximity to coastlines on peatland C dynamics, as well as the potential influence of human activities like agriculture drainage and peat extraction on C loss. Findings underscore the importance of conserving and protecting pristine peatlands, which, as natural C sinks, are vital for mitigating greenhouse gas emissions. Overall, this dissertation underscores the critical importance of peatlands in global C cycling and climate regulation. The research highlights the necessity of conservation efforts to protect these ecosystems from degradation, as their disruption could lead to substantial greenhouse gas emissions and further accelerate climate change. By examining the complex interactions between environmental conditions, C sequestration, and human impacts, this dissertation contributes to a deeper understanding of peatlands' vulnerability and resilience, informing strategies for their preservation in a rapidly changing world.
일반주제명  
Biogeochemistry
일반주제명  
Geography
일반주제명  
Atmospheric sciences
일반주제명  
Climate change
키워드  
Carbon
키워드  
Microbial decomposition
키워드  
Organic matter
키워드  
Peatlands
키워드  
Greenhouse gas
기타저자  
University of California, Los Angeles Geography 0396
기본자료저록  
Dissertations Abstracts International. 86-06A.
전자적 위치 및 접속  
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MARC

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■1001  ▼aHedgpeth,  Alexandra.
■24510▼aUsing  Isotopes  to  Explore  Global  Peat  Carbon  Dynamics
■260    ▼a[Sl]▼bUniversity  of  California,  Los  Angeles▼c2024
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2024
■300    ▼a178  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  86-06,  Section:  A.
■500    ▼aAdvisor:  Cavanaugh,  Kyle  C.
■5021  ▼aThesis  (Ph.D.)--University  of  California,  Los  Angeles,  2024.
■520    ▼aThis  dissertation  investigates  the  role  of  peatlands  as  critical  carbon  (C)  reservoirs  that  sequester  approximately  600  gigatons  of  C  globally,  effectively  acting  as  a  significant  buffer  against  climate  change.  Despite  their  limited  geographic  extent-covering  only  3%  of  the  Earth's  surface-peatlands  store  nearly  twice  the  C  of  all  global  forests  combined.  This  exceptional  C  storage  potential  is  largely  due  to  the  waterlogged,  anoxic  conditions  in  these  ecosystems  that  inhibit  microbial  decomposition  and  allow  organic  matter  to  accumulate  over  millennia.  However,  peatlands  are  highly  vulnerable  to  both  natural  and  anthropogenic  pressures,  including  climate  change,  land-use  modifications,  and  direct  human  disturbances,  all  of  which  threaten  their  capacity  to  serve  as  long-term  C  sinks.  This  dissertation  leverages  isotopic  analysis  to  examine  peatland  C  dynamics  across  diverse  regions  and  contexts  by  exploring  the  mechanisms  driving  C  dynamics  in  tropical,  boreal,  and  temperate  peatlands,  focusing  on  both  surface-derived  and  deep  peat  C  emissions  and  accumulation.  Tropical  peatlands,  which  differ  from  boreal  and  temperate  peatlands  due  to  consistently  warm  temperatures  and  seasonal  rainfall,  contain  highly  dense  C  deposits  but  are  also  at  heightened  risk  of  C  release  under  changing  rainfall  patterns.  One  case  study  examines  tropical  peatlands  in  Central  America,  where  consistently  warm  temperatures  and  seasonal  rainfall  create  dense  C  deposits.  These  tropical  systems  are  especially  susceptible  to  C  loss  with  changing  rainfall  patterns,  potentially  releasing  stored  C  from  deep  peat  layers.  In  boreal  regions,  experimental  warming  simulates  future  climate  conditions,  assessing  how  elevated  temperatures  and  CO₂  concentrations  affect  C  storage  across  peat  depths.  Additionally,  this  dissertation  uses  global  radiocarbon  data  to  analyze  peat  accumulation  and  stability  across  climates,  providing  insights  into  regional  differences  in  peatland  resilience  under  environmental  changes.  These  studies  together  highlight  the  significant  impact  of  environmental  variables  such  as  precipitation,  temperature,  and  proximity  to  coastlines  on  peatland  C  dynamics,  as  well  as  the  potential  influence  of  human  activities  like  agriculture  drainage  and  peat  extraction  on  C  loss.  Findings  underscore  the  importance  of  conserving  and  protecting  pristine  peatlands,  which,  as  natural  C  sinks,  are  vital  for  mitigating  greenhouse  gas  emissions.  Overall,  this  dissertation  underscores  the  critical  importance  of  peatlands  in  global  C  cycling  and  climate  regulation.  The  research  highlights  the  necessity  of  conservation  efforts  to  protect  these  ecosystems  from  degradation,  as  their  disruption  could  lead  to  substantial  greenhouse  gas  emissions  and  further  accelerate  climate  change.  By  examining  the  complex  interactions  between  environmental  conditions,  C  sequestration,  and  human  impacts,  this  dissertation  contributes  to  a  deeper  understanding  of  peatlands'  vulnerability  and  resilience,  informing  strategies  for  their  preservation  in  a  rapidly  changing  world.
■590    ▼aSchool  code:  0031.
■650  4▼aBiogeochemistry
■650  4▼aGeography
■650  4▼aAtmospheric  sciences
■650  4▼aClimate  change
■653    ▼aCarbon
■653    ▼aMicrobial  decomposition
■653    ▼aOrganic  matter
■653    ▼aPeatlands
■653    ▼aGreenhouse  gas
■690    ▼a0425
■690    ▼a0366
■690    ▼a0404
■690    ▼a0725
■71020▼aUniversity  of  California,  Los  Angeles▼bGeography  0396.
■7730  ▼tDissertations  Abstracts  International▼g86-06A.
■790    ▼a0031
■791    ▼aPh.D.
■792    ▼a2024
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17165095▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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