서브메뉴
검색
Dead or Alive: Fungal Controls on Decomposition and Soil Carbon Storage in Northern Temperate Forests
Dead or Alive: Fungal Controls on Decomposition and Soil Carbon Storage in Northern Temperate Forests
상세정보
- 자료유형
- 학위논문 서양
- 최종처리일시
- 20260202104839
- ISBN
- 9798293868544
- DDC
- 574.5
- 서명/저자
- Dead or Alive: Fungal Controls on Decomposition and Soil Carbon Storage in Northern Temperate Forests
- 발행사항
- [Sl] : University of Minnesota, 2025
- 발행사항
- Ann Arbor : ProQuest Dissertations & Theses, 2025
- 형태사항
- 142 p
- 주기사항
- Source: Dissertations Abstracts International, Volume: 87-03, Section: B.
- 주기사항
- Advisor: Hobbie, Sarah E.;Kennedy, Peter G.
- 학위논문주기
- Thesis (Ph.D.)--University of Minnesota, 2025.
- 초록/해제
- 요약Soils store more carbon (C) than living vegetation and the atmosphere combined. Therefore, understanding the factors that regulate soil C storage and loss (decomposition) will be critical in understanding C cycling under ongoing climate change. Fungi play key roles in decomposition and C storage in forests by being the primary decomposers (saprotrophs) and acting as plant mutualists (ectomycorrhizal fungi; ECM). It has been hypothesized that these ECM fungi, which receive C from their host plant, can outcompete saprotrophs for nitrogen (N), reducing decomposition. However, it is unclear a) whether this suppressive effect of ECM fungi on decomposition leads to increased C storage and b) how widespread it is among temperate pine forests. Further, recent research has found a majority of soil C and N is made up of dead fungal hyphae (necromass), yet the chemical controls on C and N loss from necromass during decomposition and how these interact with global change factors like N addition, are poorly understood. The goals of this dissertation are therefore to elucidate the consequences and variation of ECM-saprotroph interactions and to clarify how N fertilization impacts fungal necromass decomposition. In chapter 1 I found that the presence of ECM fungi decreased the decomposition of belowground tissues and increased soil C stocks by 10%. This latter effect was strongest in the top 5 cm of soil and in fast-cycling, unprotected soil C. In chapter 2 I found that ECM suppression of leaf litter decomposition is not as widespread across temperate pine forests as previously theorized. Rather, ECM fungi either increase or do not affect pine litter decomposition in pine forests in California, Minnesota, and Florida. In chapter 3 I found that necromass C loss, N loss, and responses to fertilization varied with necromass chemistry. Specifically, N addition inhibited late stage necromass decomposition, but this effect was weakest in melanin-rich necromass, contrary to hypotheses based on plant litter. Together, these results add to our understanding of how fungi, dead and alive, influence soil C and N cycling and highlight the diversity and importance of fungal chemistry and interguild interactions.
- 일반주제명
- Ecology
- 일반주제명
- Biogeochemistry
- 일반주제명
- Forestry
- 일반주제명
- Biochemistry
- 일반주제명
- Climate change
- 키워드
- Carbon
- 키워드
- Decomposition
- 키워드
- Fungi
- 키워드
- Necromass
- 키워드
- Nitrogen
- 기타저자
- University of Minnesota Ecology Evolution and Behavior
- 기본자료저록
- Dissertations Abstracts International. 87-03B.
- 전자적 위치 및 접속
- 로그인 후 원문을 볼 수 있습니다.
MARC
008260126s2025 us c eng d■001000017359132
■00520260202104839
■006m o d
■007cr#unu||||||||
■020 ▼a9798293868544
■035 ▼a(MiAaPQ)AAI32172367
■040 ▼aMiAaPQ▼cMiAaPQ
■0820 ▼a574.5
■1001 ▼aDeLancey, Lang Carl.
■24510▼aDead or Alive: Fungal Controls on Decomposition and Soil Carbon Storage in Northern Temperate Forests
■260 ▼a[Sl]▼bUniversity of Minnesota▼c2025
■260 1▼aAnn Arbor▼bProQuest Dissertations & Theses▼c2025
■300 ▼a142 p
■500 ▼aSource: Dissertations Abstracts International, Volume: 87-03, Section: B.
■500 ▼aAdvisor: Hobbie, Sarah E.;Kennedy, Peter G.
■5021 ▼aThesis (Ph.D.)--University of Minnesota, 2025.
■520 ▼aSoils store more carbon (C) than living vegetation and the atmosphere combined. Therefore, understanding the factors that regulate soil C storage and loss (decomposition) will be critical in understanding C cycling under ongoing climate change. Fungi play key roles in decomposition and C storage in forests by being the primary decomposers (saprotrophs) and acting as plant mutualists (ectomycorrhizal fungi; ECM). It has been hypothesized that these ECM fungi, which receive C from their host plant, can outcompete saprotrophs for nitrogen (N), reducing decomposition. However, it is unclear a) whether this suppressive effect of ECM fungi on decomposition leads to increased C storage and b) how widespread it is among temperate pine forests. Further, recent research has found a majority of soil C and N is made up of dead fungal hyphae (necromass), yet the chemical controls on C and N loss from necromass during decomposition and how these interact with global change factors like N addition, are poorly understood. The goals of this dissertation are therefore to elucidate the consequences and variation of ECM-saprotroph interactions and to clarify how N fertilization impacts fungal necromass decomposition. In chapter 1 I found that the presence of ECM fungi decreased the decomposition of belowground tissues and increased soil C stocks by 10%. This latter effect was strongest in the top 5 cm of soil and in fast-cycling, unprotected soil C. In chapter 2 I found that ECM suppression of leaf litter decomposition is not as widespread across temperate pine forests as previously theorized. Rather, ECM fungi either increase or do not affect pine litter decomposition in pine forests in California, Minnesota, and Florida. In chapter 3 I found that necromass C loss, N loss, and responses to fertilization varied with necromass chemistry. Specifically, N addition inhibited late stage necromass decomposition, but this effect was weakest in melanin-rich necromass, contrary to hypotheses based on plant litter. Together, these results add to our understanding of how fungi, dead and alive, influence soil C and N cycling and highlight the diversity and importance of fungal chemistry and interguild interactions.
■590 ▼aSchool code: 0130.
■650 4▼aEcology
■650 4▼aBiogeochemistry
■650 4▼aForestry
■650 4▼aBiochemistry
■650 4▼aClimate change
■653 ▼aCarbon
■653 ▼aDecomposition
■653 ▼aFungi
■653 ▼aNecromass
■653 ▼aNitrogen
■653 ▼aSoil organic matter
■690 ▼a0329
■690 ▼a0425
■690 ▼a0478
■690 ▼a0487
■690 ▼a0404
■71020▼aUniversity of Minnesota▼bEcology, Evolution and Behavior.
■7730 ▼tDissertations Abstracts International▼g87-03B.
■790 ▼a0130
■791 ▼aPh.D.
■792 ▼a2025
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T17359132▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.


