scholarly journals Stoichiometric homeostasis of wetland vegetation along a nutrient gradient in a subtropical wetland. Understanding stoichiometric mechanisms of nutrient retention in wetland macrophytes

2017 ◽  
Author(s):  
Paul Julian ◽  
Stefan Gerber ◽  
Rupesh K. Bhomia ◽  
Jill King ◽  
Todd Z. Osborne ◽  
...  
Keyword(s):  
Aquatic Vegetation ◽  
Nutrient Retention ◽  
Nutrient Utilization ◽  
Wetland Vegetation ◽  
Stormwater Treatment ◽  
Treatment Area ◽  
Wetland Ecosystems ◽  
Nutrient Gradient ◽  
Stormwater Treatment Area ◽  
Large Gradient

AbstractNutrient homeostasis relates ambient stoichiometric conditions in an environment to the stoichiometry of living entities of the ecosystem. In wetland ecosystems, vegetation can be a large, highly variable and dynamic sink of nutrients. This study investigated stoichiometric homeostasis of dominant emergent and submerged aquatic vegetation (EAV and SAV, respectively) within two treatment flow-ways (FW) of Everglades Stormwater Treatment Area 2 (STA-2). These FW encompass a large gradient in plant nutrient availability. The hypotheses of this study is that wetland vegetation is non-homeostatic relative to ambient nutrients and consequently nutrient resorption will not vary along the nutrient gradient. We developed a framework to investigate how vegetation uptake and resorption of nutrients contribute separately to homeostasis. Overall, the wetland vegetation in this study was non-homeostatic with respect to differential uptake of nitrogen (N) vs. phosphorus (P). Resorption evaluated for EAV was high for P and moderate for N, resorption efficiency did not significantly vary along the gradient and therefore did not affect overall homeostatic status. Nutrient addition experiments may help to compensate for some of the limitation of our study, especially with respect to resolving the primary nutrient source (organic vs. inorganic sources, water vs. soil compartment) and nutrient utilization rates.

scholarly journals Understanding potential drivers of aquatic metabolism in a subtropical treatment wetland

2020 ◽  
Author(s):  
Paul Julian ◽  
Todd Z. Osborne
Keyword(s):  
Aquatic Vegetation ◽  
Chemical Processes ◽  
Ecosystem Metabolism ◽  
Stormwater Treatment ◽  
Treatment Wetland ◽  
Treatment Area ◽  
Stormwater Treatment Area ◽  
Aquatic Productivity ◽  
Changes Over Time ◽  
Physical And Chemical

AbstractChanges of dissolved oxygen (DO) in aquatic ecosystems integrates dynamic biological, physical and chemical processes that control the rate of ecosystem metabolism. Aquatic ecosystem metabolism can be characterized by the diel change in DO changes over time and is expressed as the net aquatic productivity (NAP). This study investigated aquatic metabolism of dominant emergent and submerged aquatic vegetation (EAV and SAV, respectively) within two treatment flow-ways (FW) of Stormwater Treatment Area 2 (STA-2) in the Everglades ecosystem. The hypothesis of this study is that aquatic metabolism will differ between aquatic vegetation communities with SAV communities will have a greater GPP and ER rate than EAV communities driven by biophysical, hydrodynamic and biogeochemical differences between systems. Aquatic metabolism observed in this study vary spatially (along FWs) and temporally (diel to days) controlled by different effects related biological, physical and chemical processes. This study suggests that ecosystem metabolism is controlled differently across FWs with varying levels of response to loading/transport and water column attributes resulting in differences in organic matter accumulation, C turnover and phosphorus cycling.

Temporal and Spatial Patterns of Internal Phosphorus Recycling in a South Florida (USA) Stormwater Treatment Area

2012 ◽  
Vol 41 (5) ◽  
pp. 1661-1673 ◽  
Author(s):  
Forrest E. Dierberg ◽  
Thomas A. DeBusk ◽  
Jaimee L. Henry ◽  
Scott D. Jackson ◽  
Stacey Galloway ◽  
...  
Keyword(s):  
Spatial Patterns ◽  
South Florida ◽  
Stormwater Treatment ◽  
Treatment Area ◽  
Temporal And Spatial Patterns ◽  
Stormwater Treatment Area ◽  
Temporal And Spatial ◽  
Phosphorus Recycling

scholarly journals DETERMINATION OF THE PRESENT VEGETATION STATE OF A WETLAND WITH UAV RGB IMAGERY

2017 ◽  
Vol XLII-3/W2 ◽  
pp. 37-41
Author(s):  
M. A. Boon ◽  
S. Tesfamichael
Keyword(s):  
High Resolution ◽  
Structural Characteristics ◽  
Nutrient Retention ◽  
Point Clouds ◽  
Change Score ◽  
Vital Role ◽  
Wetland Vegetation ◽  
Evaluation Methodology ◽  
Wetland Ecosystems

The compositional and structural characteristics of wetland vegetation play a vital role in the services that a wetland supplies. Apart from being important habitats, wetland vegetation also provide services such as flood attenuation and nutrient retention. South Africa is known to be a water scarce country. The protection and continuous monitoring of wetland ecosystems is therefore important. Factors such as site transformation and disturbance may completely change the vegetation of a wetland and the use of Unmanned Aerial Vehicle (UAV) imagery can play a valuable role in high-resolution monitoring and mapping. This study assessed if the use of UAV RGB imagery can enhance the determination of the present vegetation state of a wetland. The WET-Health level two (detailed on-site evaluation) methodology was followed for the vegetation assessment, where wetland health is a measure of the deviation of a wetland’s structure and function from its natural reference condition. The mapping of the disturbances classes was then undertaken using ultra-high resolution orthophotos, point clouds and digital surface models (DSM). The WET-Health vegetation module completed with the aid of the UAV products still indicates that the vegetation of the wetland is largely modified (“D” PES Category) and that the vegetation of the wetland will further deteriorate (change score). These results are the same as determined in the baseline study. However a higher impact (activities taking place within the wetland) score were determined. The assessment of various WET-Health vegetation indicators were significantly enhanced using the UAV imagery and derived products. The UAV products provided an accurate vantage point over the wetland and surroundings, and assisted to easily refine the assessment of the disturbance classes and disturbance units.

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