Allochthonous organic matter as carbon, nitrogen and phosphorus source on a sandbank island (Kachelotplate, Lower Saxonian Wadden Sea, Germany)

2008 ◽  
Vol 38 (2) ◽  
pp. 153-161 ◽  
Author(s):  
Gerd Liebezeit ◽  
Ralf Wöstmann ◽  
Steffen Wolters
Keyword(s):  
Organic Matter ◽  
Wadden Sea ◽  
Allochthonous Organic Matter ◽  
Nitrogen And Phosphorus ◽  
Phosphorus Source ◽  
Sandbank Island

scholarly journals Hydrological/hydrochemical Characteristics of the Upper and Lower Volga Reservoirs during the Low-water Period

2014 ◽  
pp. 14-31
Author(s):  
Keyword(s):  
Organic Matter ◽  
Phosphorus Content ◽  
Biogenic Elements ◽  
Hydrochemical Characteristics ◽  
Allochthonous Organic Matter ◽  
Nitrogen And Phosphorus ◽  
Kuibyshev Reservoir ◽  
Large Cities ◽  
Lower Volga ◽  
Volga Reservoirs

This study of some hydrophysical and hydrochemical (biogenic elements, organic matter) parameters was conducted in the Rybinsk, Gorky, Cheboksary, Volga reservoirs and the Volga-Kama stretch of the Kuibyshev Reservoir during the most tense period of summer low-water. It is shown that during the low-water period differences in nitrogen and phosphorus content between the lacustrine and riverine parts of the Gorky reservoir, observed in spring time, smooth out. The load of allochthonous organic matter decreases and phosphates content increases downstream the cascade of these reservoirs. Water areas downstream large cities can be regarded areas of high environmental risk.

Fish farming in Denmark: environmental impact of regulative legislation

1995 ◽  
Vol 31 (10) ◽  
pp. 73-84 ◽  
Author(s):  
T. M. Iversen
Keyword(s):  
Organic Matter ◽  
Environmental Impact ◽  
Freshwater Fish ◽  
Aquatic Environment ◽  
Action Plan ◽  
Fish Farming ◽  
Fish Farms ◽  
Nitrogen And Phosphorus ◽  
Local Impact ◽  
The Impact

The main environmental problems associated with fish farming in Denmark are attributable to the dam, the “dead reach” and nutrient and organic matter discharge. The environmental regulation of fish farming in Denmark started with the Environmental Protection Act of 1974, the Statutory Order of 1985 forbidding wet feed, and the Action Plan on the Aquatic Environment of 1987. In the case of freshwater fish farms, the latter was implemented through the measures stipulated in the 1989 Statutory Order on Fish Farms. The impact of Danish legislative measures to reduce and regulate the environmental effects of freshwater fish farms can be summarized as follows: - the number of fish farms has been reduced from about 800 in 1974 to about 500 at present; - production has tripled since 1974 and has been stable since 1989; - a change from wet to dry feed has reduced the environmental impact of the farms; - the national goals of the Action Plan on the Aquatic Environment of 1987 for reducing fish farm discharges of organic matter, nitrogen and phosphorus have been fulfilled. The main remaining problems are that: - the local impact of fish farms on downstream stream quality is still much too high in about 15% of cases; - the problem of the passage of migrating invertebrates and fish is still unsolved at some farms; - the problems posed by “dead reaches” are still unsolved. It is concluded that sustainable fish farming is possible in Denmark, but with the present technology production will have to be significantly reduced.

Sources and distribution of allochthonous organic matter in surface sediment from the Seomjin River to the southern inner shelf of Korea

2017 ◽  
Vol 52 (4) ◽  
pp. 489-499
Author(s):  
Adegoke Olugboyega Badejo ◽  
Sangmin Hyun ◽  
Wonnyon Kim ◽  
Se-Jong Ju ◽  
Bareum Song
Keyword(s):  
Organic Matter ◽  
Surface Sediment ◽  
Allochthonous Organic Matter ◽  
Inner Shelf ◽  
Seomjin River

Bacterial decomposition of allochthonous organic matter in shallow subtropical lakes

2021 ◽  
Vol 26 (4) ◽  
Author(s):  
Pâmela R. Gayer ◽  
Pablo S. Guimarães ◽  
Edélti F. Albertoni ◽  
Luiz U. Hepp
Keyword(s):  
Organic Matter ◽  
Allochthonous Organic Matter ◽  
Subtropical Lakes ◽  
Bacterial Decomposition

Application of membrane bioreactor system with full scale plant on livestock wastewater

2005 ◽  
Vol 51 (6-7) ◽  
pp. 465-471 ◽  
Author(s):  
H. Kim ◽  
H.-S. Kim ◽  
I.-T. Yeom ◽  
Y.-B. Chae
Keyword(s):  
Organic Matter ◽  
Membrane Bioreactor ◽  
Full Scale ◽  
Nitrogen And Phosphorus ◽  
Livestock Wastewater ◽  
Bioreactor System ◽  
High Level

A full-scale plant of an MBR system treating livestock wastewater has shown impressive results. The Cheorwon County Environmental Authorities adopted the MBR process with UF membrane for retrofitting the old plant, which removes organic matter, nitrogen and phosphorus at a high level. According to 6 months operation data, BOD and SS removal were about 99.9% and CODMn, TN and TP removal were 92.0%, 98.3% and 82.7%, respectively. It is considered that the temperature at the bioreactor has to be controlled to be below 40 °C so as to ensure sufficient nitrification. It appeared that the MBR system is competitive with other conventional technologies for treatment of livestock wastewater such as piggery waste.

Consequences of nutrient load reductions for carbon and alkalinity dynamics within the region of freshwater influence of River Elbe

2021 ◽  
Author(s):  
Johannes Paetsch ◽  
Helmuth Thomas
Keyword(s):  
Organic Matter ◽  
Organic Carbon ◽  
Sulfate Reduction ◽  
Biogeochemical Model ◽  
Time Interval ◽  
Nutrient Loads ◽  
Organic Matter Degradation ◽  
Strong Decrease ◽  
Nitrogen And Phosphorus ◽  
River Elbe

<p>Since the early eighties of the 20<sup>th</sup> century nitrogen and phosphorus loads of the River Elbe, a river entering the North European Shelf at the southeastern coast, have decreased by a factor of about four. This resulted in a reduction of the eutrophication status in the adjacent German Bight and the coastal waters west of Denmark. In addition, benthic carbon and alkalinity pools have changed due to 1- changed carbon loads and, 2- changed decay pathways of benthic organic carbon.</p><p>We investigate the consequences of observed nutrient and organic loads by rivers with a 3D-biogeochemical model including a 3D-early diageneses model within the sediment for the time 1979 - 2014.   </p><p>The results show a strong decrease of benthic carbon rather due to decreasing nutrient loads and subsequent autochthonous biological production than changes in organic loads. The export of inorganic carbon from the sediment is related to the magnitude of benthic organic carbon and cannot explain the strong decrease of the benthic POC pool. During the time until the early nineties aerobic degradation increases, whereas denitrification and sulfate reduction as organic matter degradation pathway decreases.</p><p>Alkalinity production due to benthic organic matter degradation decreases over the first half of the investigated time interval and keeps constant during the second half. Denitrification and sulfate reduction dominate the mechanisms decreasing the alkalinity export. Benthic nitrification consuming alkalinity strongly increases during the first half of the time dampening the decrease of alkalinity export.</p>

Soil contents and stoichiometry of carbon, nitrogen, and phosphorus in Finnish farmland and feedbacks on management patterns

2021 ◽  
Author(s):  
Sichu Wang ◽  
Oona Uhlgren ◽  
Anna-Reetta Salonen ◽  
Jussi Heinonsalo
Keyword(s):  
Organic Matter ◽  
Management Practice ◽  
Combustion Method ◽  
Agricultural Management ◽  
Soil Columns ◽  
Nitrogen And Phosphorus ◽  
Deep Soil ◽  
C:N:P Stoichiometry ◽  
Soil Layers ◽  
Soil C

<p>The coupled cycles and interactions of soil carbon (C), nitrogen (N), and phosphorus (P) are fundamental for soil quality and soil organic matter (SOM) formation. Low C:N ratios through nitrogenous fertilizer addition may accelerate SOM cycling and promote C mineralization in soil, whereas P limitations may decline C storage by reducing plant and microbial biomass production. Deeper soil layers’ C-N-P stoichiometry has an important role in regulating SOM formation in subsoils. However, there is little information on soil C:N:P stoichiometry in deep soil layers of farmland. In this study, soil columns up to one meter were collected from 32 farms distributing across Finland with different soil texture and agricultural management history. The one-meter soil columns were cut into 10 cm deep slices and analyzed for the total organic carbon (TOC), total nitrogen (TN) by dry combustion method and total phosphorus (TP) contents by aqua regia digestion and ICP-OES method. Overall, the TOC, TN and TP contents all dropped sharply in 30-40 cm soil layers, but TP contents rose again in deep soil. The role of agricultural management practice (including crop rotation, crop cover, crop diversity and fertilization) on soil C:N:P stoichiometry as well as organic matter accumulation in the deep soil layers were explored. The preliminary results will be presented in the poster. The data deepens our understanding of soil C, N and P coupling and interaction related to soil C sequestration.</p>

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