Author: Jennifer A. VaughnPublisher:
ISBN:
Category :
Languages : en
Pages : 137
Book Description
Dissolved Organic Carbon Dynamics in the Upper Hudson River Basin
Author: Jennifer A. VaughnDissolved Organic Carbon Dynamics During the Snowmelt Period in a Small Urban Watershed
Author: Jaclyn L. O'RileyPublisher:
ISBN:
Category : Neponset River (Mass.)
Languages : en
Pages : 240
Book Description
Dissolved Organic Carbon and Nitrogen Dynamics in a Pristine Old Growth Forested Watershed with Anthropogenic Nitrogen Deposition
Author: Christopher AmyotPublisher:
ISBN:
Category :
Languages : en
Pages :
Book Description
"Forested watersheds play an important role in the transformation of nitrogen (N) and carbon (C) as they pass from atmospheric inputs to aquatic ecosystems, under diverse anthropogenic nitrogen deposition and land cover regimes. In this study, I examined the transformations of dissolved organic carbon (DOC), ammonium (NH4), nitrate (NO3), and dissolved organic nitrogen (DON) from precipitation inputs through the forest canopy, into the well-drained and wetland soils, and into two streams draining a 46 ha and a 11 ha nested old growth forested watersheds at Mont St. Hilaire (MSH), in southern Quebec. Measurements were made from May to September 2013, with sampling at one-week intervals and during storm events. Concentrations and fluxes of DOC, NH4, and DON increased from the atmosphere to throughfall, and decreased as water passed through the upland mineral soils and wetlands to the stream, while NO3 showed no change. Transformations of DON occurred as water passed through persistently saturated areas within the wetland and surrounding the stream, resulting in biogeochemical hotspots, where DON concentrations significantly decreased. DOC did not respond these locations, yet is positively correlated to DON and increased water depth. Yearly estimated inputs through the forest canopy were 4.04 kg/ha/yr, 5.61 kg/ha/yr, 3.14 kg/ha/yr, and 79.41 kg/ha/yr for NO3, NH4, DON and DOC. Overall, N retention rates from atmospheric input to stream output were 90 % and 91 % for DON and for a combined NO3 and NH4 input-output measure, while DOC inputs were five times greater than outputs. NO3 was retained less during saturated soils conditions and DON showed slightly more retention at the beginning of the growing season. When compared to other studies with low nitrogen, MSH, showed no similarities in retention or output. Studies with high nitrogen deposition and past disturbance did compare with NO3 and NH4 retention results for MSH, however, hydrological DOC inputs-outputs, at MSH, when compared to other high nitrogen sites with anthropogenic disturbance differed, showing five times more DOC input than output, compared to two times more output than input for the disturbed sites. These findings help to define the present day N and C dynamics in an old growth forest with anthropogenic nitrogen deposition, and provide a comparison for future environmental changes and to conservation and natural resource managers during the restoration and protection of forested watersheds. " --
Selected Water Resources Abstracts
Author: Water-quality Assessment of the Hudson River Basin in New York and Adjacent States
Author: Patrick J. PhillipsPublisher:
ISBN:
Category : Nutrient pollution of water
Languages : en
Pages : 94
Book Description
Dissolved Organic Carbon and Disinfection By-product Precursors in Waters of the Chickahominy River Basin, Virginia, and Implications for Public Supply
Author: Gary K. SpeiranPublisher:
ISBN:
Category : Disinfection and disinfectants
Languages : en
Pages : 74
Book Description
Dissolved Organic Matter Dynamics and Benthic Microbial Densities in the Upper Salmon River, Idaho
Author: John R. MoellerPublisher:
ISBN:
Category : Water
Languages : en
Pages : 172
Book Description
Landscape Function and Disturbance in Arctic Tundra
Author: James F. ReynoldsPublisher:
ISBN: 9783662011461
Category :
Languages : en
Pages : 464
Book Description
The Hudson River Estuary
Author: Jeffrey S. LevintonPublisher: Cambridge University Press
ISBN: 9780521844789
Category : History
Languages : en
Pages : 514
Book Description
The Hudson River Estuary, first published in 2006, is a scientific biography with relevance to similar natural systems.
Dissolved Organic Carbon Dynamics in Lakes and Streams in Northern Wisconsin
Author: Vanessa CzeszynskiPublisher:
ISBN:
Category : Aquatic ecology
Languages : en
Pages : 0
Book Description
Dissolved organic carbon (DOC) is naturally occurring; however, various aspects of global climate change are increasing anthropogenic DOC in freshwater systems. Here we focus on lakes and streams in the Northern Lakes and Forests region of Wisconsin. This study aimed to 1) determine DOC concentration and composition in these systems, 2) compare DOC dynamics between system types and each month sampled, and 3) determine if relationships exist between DOC and nutrient quantities and microbial community production. This study found that DOC ranged from 2.62 - 61.35 mg/L, with no differences in DOC concentrations between the system types or months sampled. However, DOC composition differed greatly between system type and months, with lakes having more autochthonous carbon and streams having more allochthonous carbon (p