scholarly journals Modeling the Effect of Enhanced Lateral Connectivity on Nutrient Retention Capacity in Large River Floodplains: How Much Connected Floodplain Do We Need?

2020 ◽  
Vol 8 ◽  
Author(s):  
Stephanie Natho ◽  
Martin Tschikof ◽  
Elisabeth Bondar-Kunze ◽  
Thomas Hein
Keyword(s):  
Nutrient Retention ◽  
Large River ◽  
Retention Capacity ◽  
Lateral Connectivity ◽  
River Floodplains

scholarly journals Effect of Drip Fertigation with Nitrogen on Yield and Nutritive Value of Melon Cultivated on a Very Light Soil

Agronomy ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 934
Author(s):  
Roman Rolbiecki ◽  
Stanisław Rolbiecki ◽  
Anna Figas ◽  
Barbara Jagosz ◽  
Dorota Wichrowska ◽  
...  
Keyword(s):  
Drip Irrigation ◽  
Nutritive Value ◽  
Nutrient Retention ◽  
Marketable Yield ◽  
Total Carotenoids ◽  
Retention Capacity ◽  
Total Sugars ◽  
Light Soil ◽  
Two Factors ◽  
Drip Fertigation

Most species of Cucurbitaceae respond favorably to irrigation, especially when combined with fertilizers. The effect of drip irrigation combined with nitrogen fertigation in melon grown on a very light soil in Central Poland, during 2013–2015, was evaluated. The field experimental design was a split-plot with four replications. Two factors were studied: (1) irrigation treatments applied in two combinations—drip irrigation + broadcast nitrogen fertilization (control), and drip irrigation + fertigation with nitrogen; (2) two cultivars—Melba and Seledyn. The total marketable yield of fruits, weight of a single fruit, and the concentration of dry matter, total sugars, monosaccharides, ascorbic acid, total carotenoids, and polyphenols were evaluated. Tested factors presented a significant effect both on the yield and nutritive value characteristics. Drip irrigation combined with nitrogen fertigation, comparing to the control, notably improved yields and nutritional value of fruits. Seledyn produced better yields than Melba. This study shows that on very light soil, with low water and nutrient retention capacity, melon should be drip-irrigated and nitrogen-fertigated to obtain the best cultivation results.

scholarly journals Geovisualization geoscience of large river floodplains

2019 ◽  
Vol 15 (3) ◽  
pp. 75-91 ◽  
Author(s):  
Joann Mossa ◽  
Yin-Hsuen Chen ◽  
Chia-Yu Wu
Keyword(s):  
Large River ◽  
River Floodplains

9.32 Large River Floodplains

2013 ◽  
pp. 645-678 ◽  
Author(s):  
T. Dunne ◽  
R.E. Aalto
Keyword(s):  
Large River ◽  
River Floodplains

Nutrient dynamics of large river floodplains

1998 ◽  
Vol 14 (2) ◽  
pp. 203-216 ◽  
Author(s):  
Andrew Spink ◽  
Richard E. Sparks ◽  
Mark Van Oorschot ◽  
Jos T. A. Verhoeven
Keyword(s):  
Nutrient Dynamics ◽  
Large River ◽  
River Floodplains

scholarly journals Spillage sedimentation on large river floodplains

2016 ◽  
Vol 42 (2) ◽  
pp. 290-305 ◽  
Author(s):  
John Lewin ◽  
Philip J. Ashworth ◽  
Robert J. P. Strick
Keyword(s):  
Large River ◽  
River Floodplains

The utility of biochar for increasing the fertility of new agricultural lands converted from boreal forests

2021 ◽  
Author(s):  
Joinal Abedin ◽  
Adrian Unc
Keyword(s):  
Boreal Forests ◽  
Agricultural Soils ◽  
Nutrient Retention ◽  
Quality Parameters ◽  
Limited Information ◽  
Agricultural Lands ◽  
Retention Capacity ◽  
Beneficial Effects ◽  
Diminishing Returns ◽  
The Impact

The agricultural soils of the Happy Valley-Goose Bay (HV-GB) region of Newfoundland and Labrador, Canada are Podzols that are converted from boreal forest and have limited productivity due to their sandy texture, acidity, low soil organic matter (SOM), CEC, and water and nutrient retention capacity. While numerous studies advocate biochar for mitigating soil quality problems and enhancing agronomic productivity, there is limited information on managing biochar for boosting productivity of Podzols under newly converted agricultural lands. A 5-year experiment evaluated the impact of eight biochar rates (0 to 80 Mg C ha-1) on soil properties including SOM, CEC, and availability of plant nutrients and metals in agricultural soils of HV-GB. Both immediate and long term impacts were thus assessed. Biochar generally improved soil fertility indicators. While the largest rates (40 and 80 Mg C ha-1) led to the greatest changes, significant changes were also found with rates as low as 10 Mg C ha-1. Increasing biochar rates had diminishing returns for soil’s quality parameters. The impact of biochar decreased with time after application, but the largest rate led to longer lasting effects. Although biochar was incorporated in topsoil, its effects were also measurable in the subsoil, albeit with a temporal delay, usually of one year. Thus, given the diminishing returns of increasing biochar rates, and that beneficial effects diminish over years, it is advisable that biochar be added in smaller amounts immediately after conversion, as little as 10 Mg C ha-1, with regular supplementation as needed.

Modelling the impact of increased lateral connectivity on nutrient retention in Austrian Danube floodplains

2020 ◽  
Author(s):  
Martin Tschikof ◽  
Stephanie Natho ◽  
Thomas Hein ◽  
Elisabeth Bondar-Kunze
Keyword(s):  
Water Quality ◽  
National Park ◽  
Nutrient Retention ◽  
Danube River ◽  
Retention Rates ◽  
Nutrient Loads ◽  
Lateral Connectivity ◽  
The Danube River ◽  
Nutrient Emissions ◽  
Semi Empirical

<p>In the last centuries, rivers in Central Europe have severely suffered from hydro-morphological alterations and excessive nutrient inputs. Their adjacent floodplains have the ability to retain transported nutrients in case of inundation, but are subject to progressing decoupling from the main river stem. In the Austrian Danube Floodplain National Park, restoration measures have been carried out and are planned for the near future to increase lateral connectivity in accordance with navigation purposes.</p><p>We investigated nutrient retention capacity in seven differently connected side arms and the potential effects of further proposed reconnection measures using two complementary modeling approaches. With existing monitoring data on hydrology, nitrate and total phosphorus concentrations for three side arms, we derived a multivariate statistical model and compared these results to a larger scaled semi-empirical retention model (Venohr et al. 2011). We modelled nutrient retention at current state and after completion of side arm reconnections in a dry (2003) and wet (2002) hydrologic year.</p><p>Both models show comparable annual retention rates and agree in calculating higher nutrient retention in floodplains where reconnection allows more frequent inundations at low discharges. The semi-empirical approach results in highest retention rates at low hydraulic loads and shows more reasonable results at high floods. On the other hand, the statistical approach predicts increasing retention rates with higher nutrient loads entering the side arms and also takes into account nitrate reduction in the remaining water bodies at times of no surface water connection.</p><p>Our results suggest that water quality of the Danube River could be improved by increasing parameters related to lateral connectivity between river and floodplain. These include in particular the frequency and area of inundation, as well as nutrient input loads into the reactive zones of floodplains. Still, a frequently hydrologically connected national park stretch after restoration reduces nutrient loads of the Upper Danube by less than 0.1% due to its small areal extent in relation to transported river nutrient loads. In order to sustain an adequate water quality in future, both a reduction in nutrient emissions and a larger area of functional floodplains along the Danube River are required.</p><p><strong>References:</strong></p><p>Venohr, M., Hirt, U., Hofmann, J., Opitz, D., Gericke, A., Wetzig, A., ... & Mahnkopf, J. (2011). Modelling of nutrient emissions in river systems–MONERIS–methods and background. International Review of Hydrobiology, 96(5), 435-483.</p><p><strong>Key words:</strong></p><p>River floodplains, lateral connectivity, nutrient retention, river restoration, floodplain reconnection, water quality</p>

scholarly journals Modelling nutrient retention in the coastal zone of an eutrophic sea

2016 ◽  
Vol 13 (20) ◽  
pp. 5753-5769 ◽  
Author(s):  
Elin Almroth-Rosell ◽  
Moa Edman ◽  
Kari Eilola ◽  
H. E. Markus Meier ◽  
Jörgen Sahlberg
Keyword(s):  
Coastal Zone ◽  
Nutrient Retention ◽  
Test Site ◽  
Type Model ◽  
Zone Model ◽  
Nutrient Loads ◽  
Retention Capacity ◽  
Open Sea ◽  
Stockholm Archipelago ◽  
Specific Retention

Abstract. The Swedish Coastal zone Model (SCM) was used at a test site, the Stockholm archipelago, located in the northern part of the central Baltic Sea, to study the retention capacity of the coastal filter on nitrogen (N) and phosphorus (P) loads from land and atmosphere. The efficiency of the coastal filter to permanently retain nutrients determines how much of the local nutrient loads actually reach the open sea. The SCM system is a nutrient–phytoplankton–zooplankton–detritus-type model coupled to a horizontally integrated, physical model in particular suitable for estuaries. In this study the Stockholm Archipelago, consisting of 86 sub-basins, was divided into three sub-areas: the inner, the intermediate and the outer archipelago. An evaluation of model results showed that the modelled freshwater supply agrees well with observations. The nutrient, salinity and temperature dynamics simulated by the SCM are also found to be in good or acceptable agreement with observations. The analysis showed that the Stockholm Archipelago works as a filter for nutrients that enter the coastal zone from land, but the filter efficiency is not effective enough to retain all the supplied nutrients. However, at least 65 and 72 % of the P and N, respectively, are retained during the studied period (1990–2012). A major part of the retention is permanent, which for P means burial. For N, almost 92 % of the permanent retention is represented by benthic denitrification, less than 8 % by burial, while pelagic denitrification is below 1 %. Highest total amounts of P and N are retained in the outer archipelago, where the surface area is largest. The area-specific retention of P and N, however, is highest in the smaller inner archipelago and decreases towards the open sea. A reduction scenario of the land loads of N and P showed that the filter efficiencies of N and P increase and the export of N from the archipelago decreases. About 15 years after the reduction, the export of P changes into an import of P from the open sea to the archipelago.

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