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A Different Peat Perspective: Quantifying Tropical Peatland Ecosystem Variables from the Ground and from Space
A Different Peat Perspective: Quantifying Tropical Peatland Ecosystem Variables from the G...
A Different Peat Perspective: Quantifying Tropical Peatland Ecosystem Variables from the Ground and from Space

Detailed Information

자료유형  
 학위논문 서양
최종처리일시  
20260202105644
ISBN  
9798265481580
DDC  
577
저자명  
Koupaei Abyazani, Nikaan.
서명/저자  
A Different Peat Perspective: Quantifying Tropical Peatland Ecosystem Variables from the Ground and from Space
발행사항  
[Sl] : The University of Wisconsin - Madison, 2025
발행사항  
Ann Arbor : ProQuest Dissertations & Theses, 2025
형태사항  
204 p
주기사항  
Source: Dissertations Abstracts International, Volume: 87-06, Section: B.
주기사항  
Advisor: Desai, Ankur.
학위논문주기  
Thesis (Ph.D.)--The University of Wisconsin - Madison, 2025.
초록/해제  
요약Peatlands are ecosystems that store immense amounts of carbon in their soil and therefore play a critical role in the global carbon cycle. However, due to climate change and anthropogenic disturbance, these ecosystems are transitioning from net carbon sinks to net carbon sources. This is especially true for tropical peatlands due to the extensive conversion of these systems to agricultural land. Despite their important ecosystem services and high vulnerability to becoming net carbon sources, tropical peatlands are not well represented in the literature relative to their temperate and boreal counterparts. This may perhaps be due to harsh environmental conditions and/or due to site remoteness. In this dissertation, I explore the possibility of tropical peatland study through an unconventional methodology, while also conducting field measurements to contribute to the expanding literature of in situ observations in tropical peatlands. The first project focuses on testing whether the Optical Trapezoid Model (OPTRAM), a remote sensing- based model, is capable of reproducing the temporal water table fluctuations in tropical peatlands. I found that OPTRAM performs optimally in minimally forested and non-forested areas (0.7 R 1). On the other hand, in heavily forested areas, OPTRAM performance was substantially weaker (average R of −0.04 to 0.24). The second project aims to expand on the first project by testing OPTRAM's ability for predicting the probability of burned area occurrence multiple days ahead of time. I acquired burned area data from the Global Fire Emissions Database (version 4.1s). It was found that the OPTRAM value ten days prior was a relatively good indicator of burned area. Low OPTRAM values ten days prior generally had non-zero probability values, while high OPTRAM values ten days prior typically had a value of zero. The third project aims to compare the peat soil greenhouse gas fluxes between an undrained peat swamp forest, a young oil palm plantation, and a mature oil palm plantation (during second rotation of planting). Additionally, environmental variables such as air temperature, vapor pressure deficit, water table level, and precipitation were compared and their relationship with soil carbon dioxide, methane, and nitrous oxide fluxes was assessed. I found that soil methane fluxes were diminished and soil nitrous oxide and carbon dioxide fluxes were generally elevated at the plantation sites relative to the undrained site. Additionally, air temperature and water table level were found to be the largest contributors to soil greenhouse gas flux variability, while the effects of vapor pressure deficit and precipitation were minimal. Overall, this dissertation shows the successful application of remote sensing in tropical peatlands and has implications for better understanding the role these systems play in the global carbon cycle and in contributing to ongoing climate change. Furthermore, it contributes to the much-needed on-the-ground measurements in these ecosystems which may inform future conservation and sustainability policies in the region.
일반주제명  
Environmental science
일반주제명  
Biogeochemistry
일반주제명  
Soil sciences
일반주제명  
Atmospheric sciences
키워드  
Chamber measurements
키워드  
Greenhouse gases
키워드  
Peatlands
키워드  
Remote sensing
키워드  
Wetlands
기타저자  
The University of Wisconsin - Madison Atmospheric & Oceanic Sciences
기본자료저록  
Dissertations Abstracts International. 87-06B.
전자적 위치 및 접속  
로그인 후 원문을 볼 수 있습니다.

MARC

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■020    ▼a9798265481580
■035    ▼a(MiAaPQ)AAI32399608
■040    ▼aMiAaPQ▼cMiAaPQ
■0820  ▼a577
■1001  ▼aKoupaei  Abyazani,  Nikaan.
■24512▼aA  Different  Peat  Perspective:  Quantifying  Tropical  Peatland  Ecosystem  Variables  from  the  Ground  and  from  Space
■260    ▼a[Sl]▼bThe  University  of  Wisconsin  -  Madison▼c2025
■260  1▼aAnn  Arbor▼bProQuest  Dissertations  &  Theses▼c2025
■300    ▼a204  p
■500    ▼aSource:  Dissertations  Abstracts  International,  Volume:  87-06,  Section:  B.
■500    ▼aAdvisor:  Desai,  Ankur.
■5021  ▼aThesis  (Ph.D.)--The  University  of  Wisconsin  -  Madison,  2025.
■520    ▼aPeatlands  are  ecosystems  that  store  immense  amounts  of  carbon  in  their  soil  and  therefore  play  a  critical  role  in  the  global  carbon  cycle.  However,  due  to  climate  change  and  anthropogenic  disturbance,  these  ecosystems  are  transitioning  from  net  carbon  sinks  to  net  carbon  sources.  This  is  especially  true  for  tropical  peatlands  due  to  the  extensive  conversion  of  these  systems  to  agricultural  land.  Despite  their  important  ecosystem  services  and  high  vulnerability  to  becoming  net  carbon  sources,  tropical  peatlands  are  not  well  represented  in  the  literature  relative  to  their  temperate  and  boreal  counterparts.  This  may  perhaps  be  due  to  harsh  environmental  conditions  and/or  due  to  site  remoteness.  In  this  dissertation,  I  explore  the  possibility  of  tropical  peatland  study  through  an  unconventional  methodology,  while  also  conducting  field  measurements  to  contribute  to  the  expanding  literature  of  in  situ  observations  in  tropical  peatlands.  The  first  project  focuses  on  testing  whether  the  Optical  Trapezoid  Model  (OPTRAM),  a  remote  sensing-  based  model,  is  capable  of  reproducing  the  temporal  water  table  fluctuations  in  tropical  peatlands.  I  found  that  OPTRAM  performs  optimally  in  minimally  forested  and  non-forested  areas  (0.7    R    1).  On  the  other  hand,  in  heavily  forested  areas,  OPTRAM  performance  was  substantially  weaker  (average  R  of  −0.04  to  0.24).  The  second  project  aims  to  expand  on  the  first  project  by  testing  OPTRAM's  ability  for  predicting  the  probability  of  burned  area  occurrence  multiple  days  ahead  of  time.  I  acquired  burned  area  data  from  the  Global  Fire  Emissions  Database  (version  4.1s).  It  was  found  that  the  OPTRAM  value  ten  days  prior  was  a  relatively  good  indicator  of  burned  area.  Low  OPTRAM  values  ten  days  prior  generally  had  non-zero  probability  values,  while  high  OPTRAM  values  ten  days  prior  typically  had  a  value  of  zero.  The  third  project  aims  to  compare  the  peat  soil  greenhouse  gas  fluxes  between  an  undrained  peat  swamp  forest,  a  young  oil  palm  plantation,  and  a  mature  oil  palm  plantation  (during  second  rotation  of  planting).  Additionally,  environmental  variables  such  as  air  temperature,  vapor  pressure  deficit,  water  table  level,  and  precipitation  were  compared  and  their  relationship  with  soil  carbon  dioxide,  methane,  and  nitrous  oxide  fluxes  was  assessed.  I  found  that  soil  methane  fluxes  were  diminished  and  soil  nitrous  oxide  and  carbon  dioxide  fluxes  were  generally  elevated  at  the  plantation  sites  relative  to  the  undrained  site.  Additionally,  air  temperature  and  water  table  level  were  found  to  be  the  largest  contributors  to  soil  greenhouse  gas  flux  variability,  while  the  effects  of  vapor  pressure  deficit  and  precipitation  were  minimal.  Overall,  this  dissertation  shows  the  successful  application  of  remote  sensing  in  tropical  peatlands  and  has  implications  for  better  understanding  the  role  these  systems  play  in  the  global  carbon  cycle  and  in  contributing  to  ongoing  climate  change.  Furthermore,  it  contributes  to  the  much-needed  on-the-ground  measurements  in  these  ecosystems  which  may  inform  future  conservation  and  sustainability  policies  in  the  region.
■590    ▼aSchool  code:  0262.
■650  4▼aEnvironmental  science
■650  4▼aBiogeochemistry
■650  4▼aSoil  sciences
■650  4▼aAtmospheric  sciences
■653    ▼aChamber  measurements
■653    ▼aGreenhouse  gases
■653    ▼aPeatlands
■653    ▼aRemote  sensing
■653    ▼aWetlands
■690    ▼a0768
■690    ▼a0425
■690    ▼a0481
■690    ▼a0725
■71020▼aThe  University  of  Wisconsin  -  Madison▼bAtmospheric  &  Oceanic  Sciences.
■7730  ▼tDissertations  Abstracts  International▼g87-06B.
■790    ▼a0262
■791    ▼aPh.D.
■792    ▼a2025
■793    ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17360959▼nKERIS▼z이  자료의  원문은  한국교육학술정보원에서  제공합니다.

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