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Spatiotemporal variability of floodplain sediment and organic carbon retention in mountain streams of the Colorado Front Range- [electronic resource]
Spatiotemporal variability of floodplain sediment and organic carbon retention in mountain streams of the Colorado Front Range- [electronic resource]
상세정보
- 자료유형
- 학위논문(국외)
- 자관 청구기호
- 기본표목-개인명
- 표제와 책임표시사항
- Spatiotemporal variability of floodplain sediment and organic carbon retention in mountain streams of the Colorado Front Range - [electronic resource] / Sutfin, Nicholas A.
- 발행, 배포, 간사 사항
- 형태사항
- 1 online resource(348 p)
- 일반주기
- Source: Dissertation Abstracts International, Volume: 78-01(E), Section: B.
- 일반주기
- Adviser: Ellen E. Wohl.
- 학위논문주기
- Thesis (Ph.D.)--Colorado State University, 2016.
- 요약 등 주기
- 요약Organic carbon retention along river corridors is an important regulator of ecosystem processing and a growing body of research indicates that carbon storage in floodplains can be a significant component of the terrestrial carbon cycle. The first part of this dissertation reviews the literature on carbon storage along floodplains and presents a conceptual model that highlights how sediment accumulation on floodplains in cool, high-elevation mountainous environments could result in some of the highest organic carbon per area among rivers in diverse regions. Investigation of floodplain sediment along three study reaches of mountain streams in the Colorado Front Range indicates that depth-averaged mean soil organic carbon content of ∼3 -- 5 % is accurately estimated using systematic random sample at ∼10 sampling locations. Sediment samples from an additional 21 study reaches indicate correlations between organic carbon content and soil moisture, sample depth, grain size, relative elevation of the floodplain surface, thickness of soil at the sampling location, and valley confinement. Older mean pooled-radiocarbon ages of charcoal in floodplain sediment at two study reaches above 2900 m (1200 y BP) compared to ages at two study reaches below 2400 m (700 y) suggest an elevational control on floodplain disturbance regime in the Front Range. Observations of floodplain disturbance, which occurred during regional floods in September 2013, indicated an exponential increase in the amount of floodplain area disturbed with decreasing elevation and increasing distance downstream. These results suggest potential correspondence with a previously documented shift in hydroclimatic disturbance regime at ∼2300 m. Investigation of landscape-scale controls on organic carbon storage per area through comparisons of five different valley types (24 total study reaches) indicated that unconfined valleys may store more carbon per area and the dynamic environment in valley segments with multiple sub-parallel channels limits the capacity of floodplains to store sediment and associated carbon. The occurrence of multithread channels is dependent upon the presence of beavers or persistent logjams as biotic rivers of channel planform. Floodplains of single thread channels in unconfined valleys tend to be saturated and dominated by grasses and sedges, lacking the density of trees necessary to ensure continued recruitment of wood to the channel and into logjams. These results indicate that mountain streams are an important component of the terrestrial carbon cycle through carbon storage in unconfined single thread channels and ecosystem processing in more complex multithread channels.
- 주제명부출표목-일반주제명
- 주제명부출표목-일반주제명
- 주제명부출표목-일반주제명
- 부출표목-단체명
- 기본자료저록
- Dissertation Abstracts International. 78-01B(E).
- 기본자료저록
- Dissertation Abstract International
- 전자적 위치 및 접속
- 원문정보보기
- 소장사항
-
20170404 2017
MARC
008170601s2016 us esm 001c eng■001MOKWON01252579
■00520170418114926
■007cr
■020 ▼a9781339935553
■035 ▼a(MiAaPQ)AAI10137944
■040 ▼aMiAaPQ▼cMiAaPQ
■090 ▼a전자도서(박사논문)
■1001 ▼aSutfin, Nicholas A.
■24510▼aSpatiotemporal variability of floodplain sediment and organic carbon retention in mountain streams of the Colorado Front Range▼h[electronic resource]▼cSutfin, Nicholas A.
■260 ▼a[Sl]▼bColorado State University▼c2016
■300 ▼a1 online resource(348 p)
■500 ▼aSource: Dissertation Abstracts International, Volume: 78-01(E), Section: B.
■500 ▼aAdviser: Ellen E. Wohl.
■5021 ▼aThesis (Ph.D.)--Colorado State University, 2016.
■520 ▼aOrganic carbon retention along river corridors is an important regulator of ecosystem processing and a growing body of research indicates that carbon storage in floodplains can be a significant component of the terrestrial carbon cycle. The first part of this dissertation reviews the literature on carbon storage along floodplains and presents a conceptual model that highlights how sediment accumulation on floodplains in cool, high-elevation mountainous environments could result in some of the highest organic carbon per area among rivers in diverse regions. Investigation of floodplain sediment along three study reaches of mountain streams in the Colorado Front Range indicates that depth-averaged mean soil organic carbon content of ∼3 -- 5 % is accurately estimated using systematic random sample at ∼10 sampling locations. Sediment samples from an additional 21 study reaches indicate correlations between organic carbon content and soil moisture, sample depth, grain size, relative elevation of the floodplain surface, thickness of soil at the sampling location, and valley confinement. Older mean pooled-radiocarbon ages of charcoal in floodplain sediment at two study reaches above 2900 m (1200 y BP) compared to ages at two study reaches below 2400 m (700 y) suggest an elevational control on floodplain disturbance regime in the Front Range. Observations of floodplain disturbance, which occurred during regional floods in September 2013, indicated an exponential increase in the amount of floodplain area disturbed with decreasing elevation and increasing distance downstream. These results suggest potential correspondence with a previously documented shift in hydroclimatic disturbance regime at ∼2300 m. Investigation of landscape-scale controls on organic carbon storage per area through comparisons of five different valley types (24 total study reaches) indicated that unconfined valleys may store more carbon per area and the dynamic environment in valley segments with multiple sub-parallel channels limits the capacity of floodplains to store sediment and associated carbon. The occurrence of multithread channels is dependent upon the presence of beavers or persistent logjams as biotic rivers of channel planform. Floodplains of single thread channels in unconfined valleys tend to be saturated and dominated by grasses and sedges, lacking the density of trees necessary to ensure continued recruitment of wood to the channel and into logjams. These results indicate that mountain streams are an important component of the terrestrial carbon cycle through carbon storage in unconfined single thread channels and ecosystem processing in more complex multithread channels.
■590 ▼aSchool code: 0053.
■650 4▼aGeomorphology
■650 4▼aGeology
■650 4▼aSoil sciences
■690 ▼a0484
■690 ▼a0372
■690 ▼a0481
■71020▼aColorado State University▼bGeosciences.
■7730 ▼tDissertation Abstracts International▼g78-01B(E).
■773 ▼tDissertation Abstract International
■790 ▼a0053
■791 ▼aPh.D.
■792 ▼a2016
■793 ▼aEnglish
■85640▼uhttp://www.riss.kr/pdu/ddodLink.do?id=T14488438▼nKERIS▼z이 자료의 원문은 한국교육학술정보원에서 제공합니다.
■980 ▼a20170404▼f2017
