Phosphorus and Nitrogen Dynamics in Riverine Systems: Human Impacts and Management Options

Weigelhofer, Gabriele; Hein, Thomas; Bondar‐Kunze, Elisabeth

doi:10.1007/978-3-319-73250-3_10

Cited by 49 publications

(39 citation statements)

References 47 publications

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“…Such flow is facilitated by shallow soils and frequent heavy rainfall events in basins with steep topography and convex hillsides [80], and it represents the main N delivery pathway and thus the principal target for reducing N pollution in the QLB. Consistent with the view that agricultural land and associated N fertilizer inputs are key factors for protecting aquatic environments [10,27,81,82], the control of N pollution in the QLB and similar basins currently emphasizes reduced fertilization, application of controlled-release fertilizers, construction of waste water treatment plants, collection of livestock sewage, and restriction of agricultural development [83]. On the basis of SWAT modeling, a strategy which has previously been employed to identify ways to reduce pollutant loads in other regions [84,85], we suggest a shift from controlling N loads to a targeted and comprehensive strategy emphasizing N distribution and transport processes.…”

Section: Discussionmentioning

confidence: 58%

Spatiotemporal Dynamics of Nitrogen Transport in the Qiandao Lake Basin, a Large Hilly Monsoon Basin of Southeastern China

Chen

Zhang

et al. 2020

Water

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The Qiandao Lake Basin (QLB), which occupies low hilly terrain in the monsoon region of southeastern China, is facing serious environmental challenges due to human activities and climate change. Here, we investigated source attribution, transport processes, and the spatiotemporal dynamics of nitrogen (N) movement in the QLB using the Soil and Water Assessment Tool (SWAT), a physical-based model. The goal was to generate key localized vegetative parameters and agronomic variables to serve as credible information on N sources and as a reference for basin management. The simulation indicated that the basin’s annual average total nitrogen (TN) load between 2007 and 2016 was 11,474 tons. Steep slopes with low vegetation coverage significantly influenced the spatiotemporal distribution of N and its transport process. Monthly average TN loads peaked in June due to intensive fertilization of tea plantations and other agricultural areas and then dropped rapidly in July. Subsurface flow is the key transport pathway, with approximately 70% of N loads originating within Anhui Province, which occupies just 58% of the basin area. The TN yields of sub-basins vary considerably and have strong spatial effects on incremental loads entering the basin’ major stream, the Xin’anjiang River. The largest contributor to N loads was domestic sewage (21.8%), followed by livestock production (20.8%), cropland (18.6%), tea land (15.5%), forest land (10.9%), atmospheric deposition (5.6%), orchards (4.6%), industry (1.4%), and other land (0.8%). Our simulation underscores the urgency of increasing the efficiency of the wastewater treatment, conserving slope land, and optimizing agricultural management as components of a comprehensive policy to control N pollution in the basin.

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Section: Discussionmentioning

confidence: 58%

Spatiotemporal Dynamics of Nitrogen Transport in the Qiandao Lake Basin, a Large Hilly Monsoon Basin of Southeastern China

Chen

Zhang

et al. 2020

Water

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“…Die Austrocknung von Bächen wirkt sich nicht nur auf deren sichtbare Lebewelt aus, sondern beeinflusst auch die mikrobiellen Gemeinschaften in den Sedimenten, die für die Stoffaufnahme und damit für die Selbstreinigung in den Gewässern zuständig sind (Von Schiller et al 2017). Diese Selbstreinigung beschreibt die Fähigkeit von Fließgewässern, eingetragene Schmutz-und Schadstoffe aus dem Umland durch abiotische und biotische Prozesse zu binden und so möglichst permanent aus dem Wasserkreislauf zu entfernen (McColl 1974;Peterson et al 2001;Weigelhofer et al 2018). Austrocknung, aber auch Wiedervernässung kann die involvierten Mikroorganismen aufgrund von osmotischem Stress schädigen und sich -zumindest kurzfristig -negativ auf die Selbstreinigungskapazität auswirken (Sabater et al 2016;Timoner et al 2012; Abb.…”

Section: Abstract Climate Change • Intermittency • Streams • Water Quunclassified

Austrocknung von Bächen – eine Gefahr für die Wasserqualität?

Weigelhofer

Tritthart

2019

Österr Wasser- und Abfallw

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Zusammenfassung Wasserknappheit stellt eine der größten Herausforderungen für das Gewässermanagement im 21. Jahrhundert dar. Bereits jetzt zählt ein Großteil des weltweiten Gewässernetzes zu den intermittierenden, also phasenweise austrocknenden, Fließgewässern. Durch die fortschreitende globale Erwärmung werden Fließgewässer zunehmend auch in gemäßigten Klimazonen wie Österreich über längere Perioden trockenfallen. Das Projekt PURIFY (2018-21) hat zum Ziel, die Auswirkungen von Austrocknung auf die Wasserqualität und die Selbstreinigungskapazität von Bächen in verschiedenen Regionen Österreichs zu untersuchen und Faktoren zu identifizieren, die sich positiv auf die Widerstandsfähigkeit gegenüber Austrocknung auswirken. Zu diesem Zweck wurden 2018 fünf perennierende und fünf intermittierende Bachabschnitte im Burgenland, in der Steiermark und in Kärnten vor und während der Austrocknung bezüglich der Wasserqualität und der Aktivität sedimentgebundener Mikroorganismen analysiert. Trotz der ausgedehnten Trockenphase zeigten

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“…Phosphorus plays a central role in the biogeochemical cycling in floodplains (Wolf et al, 2013) and river systems (Records et al, 2016;Weigelhofer et al, 2018). The availability of soluble reactive phosphorus (SRP) in floodplains is controlled by a variety of internal biotic and abiotic processes, such as, e.g., assimilation by organisms, organic matter mineralization, and adsorption/desorption processes at the sediment/water interface (Noe et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Effect of Hydrological Connectivity on the Phosphorus Buffering Capacity of an Urban Floodplain

Preiner

Bondar‐Kunze

Pitzl

et al. 2020

Front. Environ. Sci.

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Floodplains can perform nutrient buffering functions and therefore influence the riverine nutrient dynamics depending on the extent of the hydrological connectivity. This work focused on quantifying the adsorption/desorption potential of a degraded floodplain of the Danube River (Lower Lobau) based on sediment characterization (grain size distribution, organic content, and P-fractions) and sediment type-specific P-adsorption via batch experiments. We established an adsorption/desorption budget model with a high temporal and spatial resolution. With this model, we identified spatial patterns related to hydrology and calculated the phosphorus-buffering capacity of permanent and temporary floodplain water bodies. Sediment characteristics were defined by the distance to the inflow area and the hydrological connectivity of the floodplain water bodies. The main factor for the concentration of total phosphorus (P tot) in the sediments was the grain size distribution. P tot was 10 times higher in silt-dominated sediments compared with gravel-dominated sediments. Inorganic phosphorus (P inorg) ranged between 36 and 90%, depending on the organic content of the sediments. Both the adsorption and the desorption potential of soluble reactive phosphorus (SRP) were highest in large, frequently connected water bodies and were strongly controlled by hydrology. The total adsorption potential of the floodplain was up to 40 times higher in wet years (e.g., 2002) than in dry years (e.g., 2003), when floodplain water bodies were connected less frequently to the main channel of the Danube. Up to 75% of the adsorbed SRP was desorbed and released into the water column after periods of connection. Consequently, SRP adsorption directly reduced the P-load in the Danube River main channel. The adsorption/desorption mechanisms worked as a buffering system by taking up the SRP imported during floods and releasing it over a longer period after the floods. This stimulated high primary production in the floodplain water bodies and impacted the overall P-retention of the floodplain.

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Phosphorus and Nitrogen Dynamics in Riverine Systems: Human Impacts and Management Options

Cited by 49 publications

References 47 publications

Spatiotemporal Dynamics of Nitrogen Transport in the Qiandao Lake Basin, a Large Hilly Monsoon Basin of Southeastern China

Spatiotemporal Dynamics of Nitrogen Transport in the Qiandao Lake Basin, a Large Hilly Monsoon Basin of Southeastern China

Austrocknung von Bächen – eine Gefahr für die Wasserqualität?

Effect of Hydrological Connectivity on the Phosphorus Buffering Capacity of an Urban Floodplain

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