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The role of dissolved organic carbon...
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Sanderman, Jonathan.
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The role of dissolved organic carbon in the terrestrial carbon cycle.
紀錄類型:
書目-語言資料,印刷品 : Monograph/item
正題名/作者:
The role of dissolved organic carbon in the terrestrial carbon cycle./
作者:
Sanderman, Jonathan.
面頁冊數:
235 p.
附註:
Adviser: Ronald Amundson.
Contained By:
Dissertation Abstracts International69-03B.
標題:
Biogeochemistry. -
電子資源:
http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3306322
ISBN:
9780549532149
The role of dissolved organic carbon in the terrestrial carbon cycle.
Sanderman, Jonathan.
The role of dissolved organic carbon in the terrestrial carbon cycle.
- 235 p.
Adviser: Ronald Amundson.
Thesis (Ph.D.)--University of California, Berkeley, 2007.
Dissolved organic carbon (DOC), representing a diverse array of organic compounds varying in molecular weight, reactivity and recalcitrance, is a critical yet often overlooked component of the terrestrial carbon cycle. On short time scales, DOC is the ultimate substrate that sustains soil microbial metabolism. On longer time scales, DOC is a key driver in soil formation in northern ecosystems and in the retention or mobility of many heavy metals and pesticides. Additionally, DOC is the primary reduced energy source sustaining aquatic food webs in small mountainous streams. In this dissertation, I focused on the role that DOC plays in the terrestrial carbon cycle in two contrasting northern California ecosystems---a redwood-Douglas fir forest and a coastal prairie ecosystem---by combining field monitoring with isotopic ( 13C and 14C) and spectroscopic (UV and 13C NMR) analyses of both the dissolved and solid phases of organic C.
ISBN: 9780549532149Subjects--Topical Terms:
545717
Biogeochemistry.
The role of dissolved organic carbon in the terrestrial carbon cycle.
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Dissolved organic carbon (DOC), representing a diverse array of organic compounds varying in molecular weight, reactivity and recalcitrance, is a critical yet often overlooked component of the terrestrial carbon cycle. On short time scales, DOC is the ultimate substrate that sustains soil microbial metabolism. On longer time scales, DOC is a key driver in soil formation in northern ecosystems and in the retention or mobility of many heavy metals and pesticides. Additionally, DOC is the primary reduced energy source sustaining aquatic food webs in small mountainous streams. In this dissertation, I focused on the role that DOC plays in the terrestrial carbon cycle in two contrasting northern California ecosystems---a redwood-Douglas fir forest and a coastal prairie ecosystem---by combining field monitoring with isotopic ( 13C and 14C) and spectroscopic (UV and 13C NMR) analyses of both the dissolved and solid phases of organic C.
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As water percolates through the soils of these distinct ecosystems, I found persistent and predictable changes in the chemical composition of DOC that were independent of composition of the fresh litter found at each site. The shifts in DOC chemistry with depth were consistent with the changes in bulk soil organic C---there was a general increase in the age and recalcitrance of the DOC with depth. These changes in DOC chemistry were due primarily to sorption and exchange reactions with the soil matrix and secondarily due to microbial degradation of the DOC itself.
520
$a
I found significant fluxes of C into the mineral soil at both sites but only minor losses of DOC out of the soil profile suggesting that DOC movement and retention may be an effective mechanism of redistributing soil C, and placing it deeper in soil where longer residence time pervade. By comparing these DOC fluxes with respiratory losses of CO2 and radiocarbon-based estimates of turnover time, I was able to estimate that in the upper meter of mineral soil 20 and 9% of the mineral soil C stocks could be explained by the process of DOC movement and retention at the forested and grassland sites, respectively.
520
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Scaling out from the soil profile to the small headwater catchment, I found that hydrologic routing and spatial patterns of productivity control both the concentration and composition of DOC leaving the landscape and entering the stream network. During baseflow at the coastal prairie site, water must take a slow tortuous route through the soil with ample opportunity of sorption and exchange of DOC before reaching the channel head, with the result being low concentrations of aged and highly altered DOC in stream water. During storm events, an expansion of the saturated area into the highly productive surface soils in the colluvial hollow results in the export of young DOC-rich water. At the forested site, a series of large subsurface soil pipes effectively limits the extent of shallow saturated areas contributing to stream flow and, as such, I found consistently low concentrations of older and more processed DOC in stream water regardless of flow regime.
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http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3306322
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