Primary production, nutrient dynamics, and accretion of a coastal freshwater forested wetland assimilation system in Louisiana

2008 ◽  
Vol 34 (1) ◽  
pp. 7-22 ◽  
Author(s):  
Christopher G. Brantley ◽  
John W. Day ◽  
Robert R. Lane ◽  
Emily Hyfield ◽  
Jason N. Day ◽  
...  
Keyword(s):  
Primary Production ◽  
Nutrient Dynamics ◽  
Forested Wetland ◽  
Wetland Assimilation ◽  
Assimilation System

scholarly journals Effects of changes in nutrient loading and composition on hypoxia dynamics and internal nutrient cycling of a stratified coastal lagoon

2017 ◽  
Vol 14 (19) ◽  
pp. 4423-4433 ◽  
Author(s):  
Yafei Zhu ◽  
Andrew McCowan ◽  
Perran L. M. Cook
Keyword(s):  
Water Quality ◽  
Primary Production ◽  
Total Phosphorus ◽  
Coastal Lagoon ◽  
Nutrient Dynamics ◽  
Nutrient Loading ◽  
Nitrogen Loading ◽  
Quality Model ◽  
Nitrogen Loads ◽  
Sediment Carbon

Abstract. The effects of changes in catchment nutrient loading and composition on the phytoplankton dynamics, development of hypoxia and internal nutrient dynamics in a stratified coastal lagoon system (the Gippsland Lakes) were investigated using a 3-D coupled hydrodynamic biogeochemical water quality model. The study showed that primary production was equally sensitive to changed dissolved inorganic and particulate organic nitrogen loads, highlighting the need for a better understanding of particulate organic matter bioavailability. Stratification and sediment carbon enrichment were the main drivers for the hypoxia and subsequent sediment phosphorus release in Lake King. High primary production stimulated by large nitrogen loading brought on by a winter flood contributed almost all the sediment carbon deposition (as opposed to catchment loads), which was ultimately responsible for summer bottom-water hypoxia. Interestingly, internal recycling of phosphorus was more sensitive to changed nitrogen loads than total phosphorus loads, highlighting the potential importance of nitrogen loads exerting a control over systems that become phosphorus limited (such as during summer nitrogen-fixing blooms of cyanobacteria). Therefore, the current study highlighted the need to reduce both total nitrogen and total phosphorus for water quality improvement in estuarine systems.

Primary production, nutrient dynamics and mineralisation in a northeastern Greenland fjord during the summer thaw

Polar Biology ◽  
1996 ◽  
Vol 16 (7) ◽  
pp. 497-506 ◽  
Author(s):  
Søren Rysgaard ◽  
Kaj Finster ◽  
Henning Dahlgaard
Keyword(s):  
Primary Production ◽  
Nutrient Dynamics

scholarly journals Link or sink: a modelling interpretation of the open Baltic biogeochemistry

2004 ◽  
Vol 1 (1) ◽  
pp. 219-274 ◽  
Author(s):  
M. Vichi ◽  
P. Ruardij ◽  
J. W. Baretta
Keyword(s):  
Organic Matter ◽  
Primary Production ◽  
Water Column ◽  
Nutrient Dynamics ◽  
Net Primary Production ◽  
Meteorological Data ◽  
Euphotic Zone ◽  
Nutrient Loads ◽  
Intermediate Waters ◽  
The Baltic

Abstract. A 1-D model system, consisting of the 1-D version of the Princeton Ocean Model (POM) coupled with the European Regional Seas Ecosystem Model (ERSEM) has been applied to a sub-basin of the Baltic Proper, the Bornholm basin. The model has been forced with 3h meteorological data for the period 1979-1990, producing a 12-year hindcast validated with datasets from the Baltic Environmental Database for the same period. The model results demonstrate the model to hindcast the time-evolution of the physical structure very well, confirming the view of the open Baltic water column as a three layer system of surface, intermediate and bottom waters. Comparative analyses of modelled hydrochemical components with respect to the independent data have shown that the long-term system behaviour of the model is within the observed ranges. Also primary production processes, deduced from oxygen (over)saturation are hindcast correctly over the entire period and the annual net primary production is within the observed range. The largest mismatch with observations is found in simulating the biogeochemistry of the Baltic intermediate waters. Modifications in the structure of the model (addition of fast-sinking detritus and polysaccharide dynamics) have shown that the nutrient dynamics is linked to the quality and dimensions of the organic matter produced in the euphotic zone, highlighting the importance of the residence time of the organic matter within the microbial foodweb in the intermediate waters. Experiments with different scenarios of riverine nutrient loads, assessed in the limits of a 1-D setup, have shown that the external input of organic matter makes the open Baltic model more heterotrophic. The characteristics of the inputs also drive the dynamics of nitrogen in the bottom layers leading either to nitrate accumulation (when the external sources are inorganic), or to coupled nitrification-denitrification (under strong organic inputs). The model indicates the permanent stratification to be the main feature of the system as regulator of carbon and nutrient budgets. The model predicts that most of the carbon produced in the euphotic zone is also consumed in the water column and this enhances the importance of heterotrophic benthic processes as final closures of carbon and nutrient cycles in the open Baltic.

scholarly journals Link or sink: a modelling interpretation of the open Baltic biogeochemistry

2004 ◽  
Vol 1 (1) ◽  
pp. 79-100 ◽  
Author(s):  
M. Vichi ◽  
P. Ruardij ◽  
J. W. Baretta
Keyword(s):  
Organic Matter ◽  
Primary Production ◽  
Water Column ◽  
Nutrient Dynamics ◽  
Net Primary Production ◽  
Meteorological Data ◽  
Euphotic Zone ◽  
Nutrient Loads ◽  
Intermediate Waters ◽  
The Baltic

Abstract. A 1-D model system, consisting of the 1-D version of the Princeton Ocean Model (POM) coupled with the European Regional Seas Ecosystem Model (ERSEM) has been applied to a sub-basin of the Baltic Proper, the Bornholm basin. The model has been forced with 3h meteorological data for the period 1979-1990, producing a 12-year hindcast validated with datasets from the Baltic Environmental Database for the same period. The model results demonstrate the model to hindcast the time-evolution of the physical structure very well, confirming the view of the open Baltic water column as a three layer system of surface, intermediate and bottom waters. Comparative analyses of modelled hydrochemical components with respect to the independent data have shown that the long-term system behaviour of the model is within the observed ranges. Also primary production processes, deduced from oxygen (over)saturation are hindcast correctly over the entire period and the annual net primary production is within the observed range. The largest mismatch with observations is found in simulating the biogeochemistry of the Baltic intermediate waters. Modifications in the structure of the model (addition of fast-sinking detritus and polysaccharide dynamics) have shown that the nutrient dynamics are linked to the quality and dimensions of the organic matter produced in the euphotic zone, highlighting the importance of the residence time of the organic matter within the microbial foodweb in the intermediate waters. Experiments with different scenarios of riverine nutrient loads, assessed in the limits of a 1-D setup, have shown that the external input of organic matter makes the open Baltic model more heterotrophic. The characteristics of the inputs also drive the dynamics of nitrogen in the bottom layers leading either to nitrate accumulation (when the external sources are inorganic), or to coupled nitrification-denitrification (under strong organic inputs). The model indicates the permanent stratification to be the main feature of the system as regulator of carbon and nutrient budgets. The model predicts that most of the carbon produced in the euphotic zone is also consumed in the water column and this enhances the importance of heterotrophic benthic processes as final closure of carbon and nutrient cycles in the open Baltic.

Summer nutrient dynamics in the Middle Atlantic Bight: primary production and utilization of phytoplankton carbon

1983 ◽  
Vol 5 (4) ◽  
pp. 515-537 ◽  
Author(s):  
P.G. Falkowski ◽  
J. Vidal ◽  
T.S. Hopkins ◽  
G.T. Rowe ◽  
T.E. Whitledge ◽  
...  
Keyword(s):  
Primary Production ◽  
Nutrient Dynamics ◽  
Middle Atlantic Bight ◽  
Middle Atlantic

scholarly journals Landscape Controls on Nutrient Stoichiometry Regulate Lake Primary Production at the Margin of the Greenland Ice Sheet

Ecosystems ◽  
2021 ◽  
Author(s):  
Clay Prater ◽  
Joanna E. Bullard ◽  
Christopher L. Osburn ◽  
Sarah L. Martin ◽  
Michael J. Watts ◽  
...  
Keyword(s):  
Global Change ◽  
Primary Production ◽  
Nutrient Dynamics ◽  
Ice Sheet ◽  
Greenland Ice Sheet ◽  
The Arctic ◽  
P Availability ◽  
Total Production ◽  
Accumulation Rates ◽  
Organic C

AbstractGlobal change is reshaping the physical environment and altering nutrient dynamics across the Arctic. These changes can affect the structure and function of biological communities and influence important climate-related feedbacks (for example, carbon (C) sequestration) in biogeochemical processing hot spots such as lakes. To understand how these ecosystems will respond in the future, this study examined recent (< 10 y) and long-term (1000 y) shifts in autotrophic production across paraglacial environmental gradients in SW Greenland. Contemporary lake temperatures and light levels increased with distance from the ice sheet, along with dissolved organic C (DOC) concentrations and total nitrogen:total phosphorus (TN:TP) ratios. Diatom production measured as biogenic silica accumulation rates (BSiARs) and diatom contribution to microbial communities declined across these gradients, while total production estimated using C accumulation rates and δ13C increased, indicating that autochthonous production and C burial are controlled by microbial competition and competitive displacement across physiochemical gradients in the region. Diatom production was generally low across lakes prior to the 1800’s AD but has risen 1.5–3× above background levels starting between 1750 and 1880 AD. These increases predate contemporary regional warming by 115–250 years, and temperature stimulation of primary production was inconsistent with paleorecords for ~ 90% of the last millennium. Instead, primary production appeared to be more strongly related to N and P availability, which differs considerably across the region due to lake landscape position, glacial activity and degree of atmospheric nutrient deposition. These results suggest that biological responses to enhanced nutrient supply could serve as important negative feedbacks to global change.

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