scholarly journals Effect of Three Emergent Macrophyte Species on Nutrient Retention in Aquatic Environments under Excess Nutrient Loading

2020 ◽  
Vol 54 (23) ◽  
pp. 15376-15384
Author(s):  
Myrto Nikolakopoulou ◽  
Alba Argerich ◽  
Susana Bernal ◽  
Esperança Gacia ◽  
Miquel Ribot ◽  
...  
Keyword(s):  
Nutrient Loading ◽  
Nutrient Retention ◽  
Aquatic Environments ◽  
Emergent Macrophyte ◽  
Macrophyte Species

Comparative study of six emergent macrophyte species for controlling cyanobacterial blooms in a tropical reservoir

2019 ◽  
Vol 129 ◽  
pp. 11-21 ◽  
Author(s):  
Maxine A.D. Mowe ◽  
Yiluan Song ◽  
Darren Z.H. Sim ◽  
Joy Lu ◽  
Simon M. Mitrovic ◽  
...  
Keyword(s):  
Comparative Study ◽  
Cyanobacterial Blooms ◽  
Tropical Reservoir ◽  
Emergent Macrophyte ◽  
Macrophyte Species

Water-quality issues in Ramsar wetlands

2014 ◽  
Vol 65 (7) ◽  
pp. 604 ◽  
Author(s):  
Jos T. A. Verhoeven
Keyword(s):  
Water Quality ◽  
Water Chemistry ◽  
Nutrient Loading ◽  
Nutrient Retention ◽  
Active Role ◽  
Nutrient Inputs ◽  
Ramsar Convention ◽  
Ecological Character ◽  
The Earth ◽  
Living Organisms

Wetland water chemistry, i.e. the concentrations of macro ions in the water, encompasses an important component of the ecological character of a wetland. Of these ions, nutrients play a very active role because they are exchanged between living organisms and the environment via cycling processes involving plants, animals and microbes in the ecosystem. Because many wetlands in agricultural or densely populated parts of the earth are subject to enlarged nutrient inputs, their ecological character may be affected. At the same time, nutrients are processed and retained from the through-flowing water. The present article summarises these aspects of water quality in wetlands and reflects on the development of guidance for managers of wetlands listed as internationally important under the Ramsar Convention. Protection of the water-chemistry characteristics as part of the ecological character of the wetland, consequences of nutrient loading and opportunities for nutrient retention and their limitations are critically evaluated.

Nutrient retention by tropical ecosystems: soil adsorption and plant absorption as synergistic processes

2002 ◽  
Vol 18 (6) ◽  
pp. 877-895 ◽  
Author(s):  
Martin Kellman
Keyword(s):  
Quartz Sand ◽  
Nutrient Loading ◽  
Nutrient Retention ◽  
Oxide Coatings ◽  
Two Stage ◽  
Tropical Ecosystems ◽  
Similar Treatment ◽  
Soil Adsorption ◽  
Stage Process ◽  
Coated Sand

Laboratory and growth-chamber experiments were used to evaluate whether there was evidence for nutrient retention by tropical terrestrial ecosystems being a two-stage process involving first soil adsorption and then plant absorption. Quartz sand with and without Fe and Al oxide coatings were treated with nutrient solution, then subjected to a leaching regime that simulated early wet-season conditions at a tropical location. Nutrient cations applied were rapidly lost in the initial leaches from quartz sand without oxide coatings, but showed a more gradual loss from oxide-coated sand, indicating temporary adsorption by the latter. In a second experiment, oxide-coated sand with and without seedlings of Grevillea robusta (a non-mycorrhizal tree species) were subjected to a similar treatment and leaching losses were compared. The presence of seedlings significantly reduced the losses of all nutrient cations, with the effect being minimal for Na and greatest for K, confirming that plants can gain access to temporarily adsorbed nutrients. More typical tropical soil-vegetation systems are likely to possess properties that magnify both the adsorptive and absorptive processes that have been documented in these experiments, justifying extrapolation of the experimental results to these natural systems. The existence of a two-stage process of nutrient retention provides a plausible explanation for the resistance of most tropical ecosystems to rapid loss of nutrients following events such as fires, which provide acute nutrient loading to the system.

scholarly journals Effects of Artificial LED Light on the Growth of Three Submerged Macrophyte Species during the Low-Growth Winter Season: Implications for Macrophyte Restoration in Small Eutrophic Lakes

Water ◽  
2019 ◽  
Vol 11 (7) ◽  
pp. 1512 ◽  
Author(s):  
Chao Xu ◽  
Hai-Jun Wang ◽  
Qing Yu ◽  
Hong-Zhu Wang ◽  
Xiao-Min Liang ◽  
...  
Keyword(s):  
Nutrient Loading ◽  
Submerged Macrophytes ◽  
Winter Season ◽  
Photon Flux ◽  
Ceratophyllum Demersum ◽  
Artificial Light ◽  
Eutrophic Lakes ◽  
Led Light ◽  
Shoot Number ◽  
Macrophyte Species

Eutrophication of lakes is becoming a global environmental problem, leading to, among other things, rapid reproduction of phytoplankton, increased turbidity, loss of submerged macrophytes, and the recovery of these plants following nutrient loading reduction is often delayed. Artificial light supplement could potentially be a useful method to help speeding up recovery. In this study, three common species of submerged macrophytes, Vallisneria natans, Myriophyllum spicatum and Ceratophyllum demersum, were exposed to three LED light treatments (blue, red and white) and shaded (control) for 100 days (from 10 November 2016 to 18 January 2017) in 12 tanks holding 800 L of water. All the three LED light treatments promoted growth of the three macrophyte species in terms of shoot number, length and dry mass. The three light treatments differed in their effects on the growth of the plants; generally, the red light had the strongest promoting effects, followed by blue and white. The differences in light effects may be caused by the different photosynthetic photon flux density (PPFD) of the lights, as indicated by an observed relationship of PPFD with the growth variables. The three species also responded differently to the light treatments, V. natans and C. demersum showing higher growth than M. spicatum. Our findings demonstrate that artificial light supplement in the low-growth winter season can promote growth and recovery of submerged macrophytes and hence potentially enhance their competitiveness against phytoplankton in the following spring. More studies, however, are needed to elucidate if LED light treatment is a potential restoration method in small lakes, when the growth of submerged macrophytes are delayed following a sufficiently large external nutrient loading reduction for a shift to a clear macrophyte state to have a potential to occur. Our results may also be of relevance when elucidating the role of artificial light from cities on the ecosystem functioning of lakes in urban areas.

scholarly journals Model-based analysis of nutrient retention and management for a lowland river

2005 ◽  
Vol 2 (6) ◽  
pp. 2549-2579 ◽  
Author(s):  
D. Kneis ◽  
R. Knoesche ◽  
A. Bronstert
Keyword(s):  
Nutrient Loading ◽  
Nutrient Management ◽  
Transport Model ◽  
Nutrient Retention ◽  
Late Summer ◽  
Phosphorus Release ◽  
Lowland River ◽  
Nutrient Inputs ◽  
Nitrogen And Phosphorus ◽  
External Nutrient

Abstract. In the context of the European Water Framework Directive options for improving the water quality of the lowland river Havel (Germany) were assessed. The lower section of this river is actually a polytrophic river-lake system suffering from high external nutrient loading and exhibiting significant in-river turnover. In order to gain a better understanding of present conditions and to allow integrated scenarios of nutrient management to be evaluated the catchment models SWIM and ArcEGMO-Urban were coupled with a simple, newly developed nutrient TRAnsport Model (TraM). Using the TraM model, the retention of nitrogen and phosphorus in a 55 km reach of the Lower Havel River was quantified and its temporal variation was analyzed. It was examined that about 30% of the external nitrogen input to the Lower Havel is retained within the surveyed river section. A comparison of simulation results generated with and without consideration of phosphorus retention/release revealed that summer TP concentrations are currently increased by 100–200% due to internal loading. Net phosphorus release rates of about 20 mg P m−2 d-1 in late summer were estimated for the Havel lakes. Scenario simulations with lowered external nutrient inputs revealed that persistent phosphorus limitation of primary production cannot be established within the next decade. It was shown that a further reduction in nitrogen concentrations requires emissions to be reduced in all inflows. Though the TraM model needs further extension it proved to be appropriate for conducting integrated catchment and river modeling.

scholarly journals Relating Transient Storage and Whole-System Metabolism with Nitrogen Uptake in Streams

1999 ◽  
Vol 23 ◽  
pp. 93-97
Author(s):  
Robert Hall, Jr. ◽  
Jennifer Tank
Keyword(s):  
Nutrient Uptake ◽  
Nutrient Loading ◽  
Nitrogen Loss ◽  
Nutrient Transport ◽  
Nutrient Retention ◽  
Nutrient Loss ◽  
Transient Storage ◽  
Main Stream ◽  
Stream Metabolism ◽  
System Metabolism

Streams are important landscape features because they provide an avenue for nitrogen loss from a watershed to downstream ecosystems and eventually the ocean; however, in-stream processes can control nutrient transport and export (e.g. Burns 1998). Nitrogen is an important element because it limits rates of primary production in many terrestrial and aquatic ecosystems. Alteration of the forms, timing, and concentration of nutrients is a central property of lotic systems (Fisher et al. 1998). Understanding controls on both transport and retention are central to predicting how streams influence nutrient loss from watersheds (Hedin et al. 1995, Likens and Bormann 1995, Burns 1998) and nutrient loading to downstream ecosystems (Howarth et al. 1996). With increased global nutrient loading from atmospheric sources and fertilizers, streams may play an important role in the retention, transformation and export of nutrients from the upland landscape. We know little about what controls nutrient uptake and transport in streams. There are many studies that show effects of hydrologic, biologic, and geomorphic influences on nutrient transport, but rarely have all aspects been considered in the same study. One potentially important geomorphic control is transient storage. Transient storage is water that is separated from the main channel flow and therefore, moves downstream more slowly than water in the main stream channel, which should facilitate nutrient uptake. Transient storage has been suggested to play an important role in nutrient retention in streams from both theoretical (Mulholland and DeAngelis 2000) and empirical perspectives (Valett et al. 1996, Mulholland et al. 1997). Additionally no studies have linked whole stream measures of metabolism with stream nutrient uptake, though we expect that greater C fixation or respiration will cause higher demand for nutrients. The objective of our study was to relate nutrient uptake with geomorphic and whole stream metabolism in 8 streams in Grand Teton National Park.

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