Phosphorus transport in a hotter and drier climate: in-channel release of legacy phosphorus during summer low-flow conditions DOI Creative Commons
Christine L. Dolph, Jacques C. Finlay, B. J. Dalzell

et al.

Hydrology and earth system sciences, Journal Year: 2024, Volume and Issue: 28(23), P. 5249 - 5294

Published: Dec. 6, 2024

Abstract. “Legacy phosphorus” is the historical accumulation of phosphorus (P) in soils and sediments due to past human inputs. River networks represent a potential sink and/or source legacy P, with many in-channel processes potentially governing storage mobilization P over time. The objective this study was evaluate contribution release bioavailable transport streams during summer low-flow conditions across land use gradient Minnesota, USA. We addressed through synthesis (1) water quality streamflow (Q) data collected for 143 gauged watersheds state Minnesota between 2007–2021 (22 750 total samples); (2) from 33 additional ditch, stream, river sites sampled under 2014; (3) tile drainage outlets 10 monitored farm fields 2011–2021. used geospatial random forest modeling approach identify possible drivers concentrations low flows watersheds. During late summer, one-third one-half we studied exhibited soluble reactive (SRP) that were above previously identified thresholds eutrophication 0.02–0.04 mg L−1. For these watersheds, stream SRP those observed outlets. Elevated late-summer weakened concentration–discharge relationships would otherwise appear indicate more strongly mobilizing SRP–Q responses other seasons flow conditions. While wastewater discharge likely contributed elevated high densities treatment plants, did not have substantial impacts. most important variables predicting model riparian areas (particularly crop cover); soil characteristics including erodibility, permeability, clay content; agricultural intensity (reflected via higher pesticide use, uptake by crops, fertilizer application rates); watershed precipitation; temperature. These findings suggest that, heavily impacted current inputs associated agriculture urbanization, biogeochemical mediated climate geology can result stores As summers become hotter and, at times, drier – which are predicted changes region stored channels will prolonged acute, increasing risk.

Language: Английский

Recognizing Agricultural Headwaters as Critical Ecosystems DOI Creative Commons
Magdalena Bieroza, Lukas Hallberg, John Livsey

et al.

Environmental Science & Technology, Journal Year: 2024, Volume and Issue: 58(11), P. 4852 - 4858

Published: March 4, 2024

Agricultural headwaters are positioned at the interface between terrestrial and aquatic ecosystems and, therefore, margins of scientific disciplines. They deemed devoid biodiversity too polluted by ecologists, overlooked hydrologists, perceived as a nuisance landowners water authorities. While agricultural streams widespread represent major habitat in terms stream length, they remain understudied thereby undervalued. headwater significantly modified but same time critical linkages among land, air, ecosystems. exhibit largest variation streamflow, quality, greenhouse gas emission with cascading effects on entire networks, yet underrepresented monitoring, remediation, restoration. Therefore, we call for more intense efforts to characterize understand inherent variability sensitivity these global change drivers through regulatory monitoring improve their ecosystem conditions functions purposeful evidence-based remediation.

Language: Английский

Citations

7
Conventional soil test phosphorus failed to accurately predict dissolved phosphorus release in agricultural hydromorphic soils in Brittany, Western France DOI
Sen Gu, Ewan Couic,

Gérard Gruau

et al.

Geoderma Regional, Journal Year: 2023, Volume and Issue: 34, P. e00689 - e00689

Published: July 28, 2023

Language: Английский

Citations

4
Water quality in a large complex catchment: Significant effects of land use and soil type but limited ability to detect trends DOI Creative Commons
Sara Sandström, Emma Lannergård, Martyn N. Futter

et al.

Journal of Environmental Management, Journal Year: 2023, Volume and Issue: 349, P. 119500 - 119500

Published: Nov. 10, 2023

Globally, significant societal resources are devoted to mitigating negative effects of eutrophication from excessive phosphorus (P) and nitrogen (N) loading. Potential effectiveness mitigation measures possible confounding factors often assessed using studies conducted in headwater catchments. However, success is evaluated based on trends river mouth water chemistry. It not clear how transferrable insights catchments larger rivers. Here, relationships between P suspended solids (SS) identified small agricultural were applied 30 larger, mixed land use draining into Mälaren, a Swedish great lake. Relationships streams SS concentration, catchment percentage arable clay content corroborated for the (R2 = 0.59, p-value<0.001. The same was true connections particulate 0.74, p-value<0.001). This study highlights importance land, transport, both smaller as well scales, supporting findings management relevant scales. Consequently, these should be used target reduce losses. To explore quality, we long-term (20 year) tributary quality compared amount implemented catchment. Overall improving detected regional Mann Kendall tests, but few decreasing nutrient concentrations found individual sites Generalized Additive Models (GAM). lack identifiable could due several reasons, e.g. insufficient time recently have an effect, ongoing release legacy low areal coverage poor spatial placement measures. In addition, trend detection requires large amounts data results carefully interpreted communicated.

Language: Английский

Citations

4
Effects of point and nonpoint source controls on total phosphorus load trends across the Chesapeake Bay watershed, USA DOI Creative Commons
Qian Zhang, Joel T. Bostic, Robert D. Sabo

et al.

Environmental Research Letters, Journal Year: 2023, Volume and Issue: 19(1), P. 014012 - 014012

Published: Nov. 16, 2023

Reduction of total phosphorus (TP) loads has long been a management focus Chesapeake Bay restoration, but riverine monitoring stations have shown mixed temporal trends. To better understand the regional patterns and drivers TP trends across watershed, we compiled analyzed load data from 90 non-tidal network using clustering random forest (RF) approaches. These were categorized into two distinct clusters short-term (2013-2020) trends, i.e. monotonic increase (

Language: Английский

Citations

4
Modeling the Impact of Land Use Changes and Wastewater Treatment on Water Quality and Ecosystem Services in the Yongding River Basin, North China DOI Open Access
Dan Dai, Angelos Alamanos

Water, Journal Year: 2024, Volume and Issue: 16(12), P. 1701 - 1701

Published: June 14, 2024

Rapid socioeconomic development, urbanization, agricultural activities, and infrastructure development can greatly alter natural landscapes their environmental impacts. Understanding these changes is crucial for more sustainable, integrated land management, including addressing water-related challenges. In this study, we explored the impacts of two key factors on water quality ecosystem services (ESs): use change expansion wastewater treatment (WWT) by combining cellular automata Markov (CAM), valuation modeling, statistical analyses. We examined historic forecasted future evolution. The were assessed analyzing spatial temporal distribution major pollutants, trends, economic ESs under real WWT conditions, assessing a Chinese policy in effect. Yongding River Basin North China was selected as case study due to significant urbanization over past decades arid conditions. results indicate that pollutant loads highest urban areas, followed rural domestic efficiency dominant factor pattern discharge. ES values decrease short term but increase long with expansion, owing planned restoration policy. This provides valuable insights into responses pollution spatiotemporal scales, encouraging consideration planning.

Language: Английский

Citations

1
A regional examination of the footprint of agriculture and urban cover on stream water quality DOI Creative Commons

P. L. Roshelle Chan,

George B. Arhonditsis,

Karen A. Thompson

et al.

The Science of The Total Environment, Journal Year: 2024, Volume and Issue: 945, P. 174157 - 174157

Published: June 21, 2024

Freshwater systems in cold regions, including the Laurentian Great Lakes, are threatened by both eutrophication and salinization, due to excess nitrogen (N), phosphorus (P) chloride (Cl

Language: Английский

Citations

1
Phosphorus transport in a hotter and drier climate: in-channel release of legacy phosphorus during summer low-flow conditions DOI Creative Commons
Christine L. Dolph, Jacques C. Finlay, B. J. Dalzell

et al.

Hydrology and earth system sciences, Journal Year: 2024, Volume and Issue: 28(23), P. 5249 - 5294

Published: Dec. 6, 2024

Abstract. “Legacy phosphorus” is the historical accumulation of phosphorus (P) in soils and sediments due to past human inputs. River networks represent a potential sink and/or source legacy P, with many in-channel processes potentially governing storage mobilization P over time. The objective this study was evaluate contribution release bioavailable transport streams during summer low-flow conditions across land use gradient Minnesota, USA. We addressed through synthesis (1) water quality streamflow (Q) data collected for 143 gauged watersheds state Minnesota between 2007–2021 (22 750 total samples); (2) from 33 additional ditch, stream, river sites sampled under 2014; (3) tile drainage outlets 10 monitored farm fields 2011–2021. used geospatial random forest modeling approach identify possible drivers concentrations low flows watersheds. During late summer, one-third one-half we studied exhibited soluble reactive (SRP) that were above previously identified thresholds eutrophication 0.02–0.04 mg L−1. For these watersheds, stream SRP those observed outlets. Elevated late-summer weakened concentration–discharge relationships would otherwise appear indicate more strongly mobilizing SRP–Q responses other seasons flow conditions. While wastewater discharge likely contributed elevated high densities treatment plants, did not have substantial impacts. most important variables predicting model riparian areas (particularly crop cover); soil characteristics including erodibility, permeability, clay content; agricultural intensity (reflected via higher pesticide use, uptake by crops, fertilizer application rates); watershed precipitation; temperature. These findings suggest that, heavily impacted current inputs associated agriculture urbanization, biogeochemical mediated climate geology can result stores As summers become hotter and, at times, drier – which are predicted changes region stored channels will prolonged acute, increasing risk.

Language: Английский

Citations

0