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Abstract: This presentation will cover recent research on nutrient inputs, agricultural management and nitrate concentrations in soil solution and groundwater in the southern Willamette Basin’s Groundwater Management Area (GWMA). Non-point sources are the predominant i...

The global nitrogen science-policy community lacks a holistic framework for assessing nitrogen (N) impacts on food production, ecosystems, health, and climate. This results in reduced effectiveness and societal welfare benefits in addressing N challenges and creates the potential...

Mitigating non-point source nitrogen in coastal estuaries is economically, environmentally, logistically, and socially challenging. On Cape Cod, Massachusetts, nitrogen management includes both traditional, centralized wastewater treatment and sewering as well as a number of alte...

Stream restoration is a popular but expensive approach for managing nutrients (nitrogen and phosphorus) and sediment dynamics in urban watersheds.  However, questions about costs and benefits remain.  Here, we discuss lessons learned over 20 years of investigating effec...

Nitrogen (N) fertilizer is important for agricultural yield, yet a substantial fraction of applied N is not incorporated into the crop and moves below the rooting zone as nitrate (NO3-) in agricultural systems. Our understanding of soil-water interactions below the rooting zone i...

This presentation will cover recent research on nutrient inputs, agricultural management and nitrate concentrations in soil solution and groundwater in the southern Willamette Basin’s Groundwater Management Area (GWMA). Non-point sources are the predominant inputs of nitrog...

Nitrogen fertilizer applications are important for agricultural yield, yet not all the applied nitrogen is taken up by crops, leading some to either be stored in soil or leached into groundwater. Leaching loss of nitrogen from farmland represents a loss of a valuable resource for...

Recently, interest has grown in using oyster-mediated denitrification resulting from aquaculture and restoration as mechanisms for reactive nitrogen (N) removal. To date, short-term N removal through bioextraction has received the most management interest, but there is a growing ...

Nitrogen pollution is one of the primary threats to coastal water quality globally, and governmental regulations and marine policy are increasingly requiring nitrogen remediation in management programs. Traditional mitigation strategies (e.g., advanced wastewater treatment) are n...

Stream restoration is a popular approach for managing nitrogen (N) in degraded, flashy urban streams. Here, we investigated the long-term effects of stream restoration involving floodplain reconnection on riparian and in-stream N transport and transformation in an urban...

Nitrogen fertilizer applications are important for agricultural yield, yet not all the applied nitrogen is taken up by crops, leading some to either be stored in soil or leached into groundwater. Leaching loss of nitrogen from farmland represents a loss of a valuable resource for...

This presentation will cover recent research on nutrient inputs, agricultural management and nitrate concentrations in soil solution and groundwater in the southern Willamette Basin’s Groundwater Management Area. The primary topics for this presentation will be an analysis ...

This presentation will cover recent research on nutrient inputs, agricultural management and nitrate concentrations in soil solution and groundwater in the southern Willamette Basin’s Groundwater Management Area.  The primary topics for this presentation will be an ana...

The ecological and economic importance of coastal and marine systems is widely recognised. Yet, excessive nutrient loads can lead to eutrophication, impair ecosystem services (ES), and cause significant economic costs. This work reviews existing studies to develop a spatial valua...

Many of the remaining mechanisms for reducing land-based nitrogen release in coastal communities depend on behavior change, social acceptance, and public support of localized mitigation programs. These needs necessitate appropriate and effective stakeholder engagement. Cape Cod, ...

Watershed nutrient balance studies traditionally focus on annual fluxes. In areas with strongly seasonal, Mediterranean-type climate regimes, riverine nutrient export may be greater during wet seasons when hydrologic forcing overwhelms or bypasses retention mechanisms. By combini...

Humanity’s transformation of the nitrogen cycle has major consequences for ecosystems, climate and human health, making it one of the key environmental issues of our time. Understanding how trends could evolve over the course of the 21st century is crucial for scientists an...

Many of the remaining mechanisms for reducing land-based nitrogen release in coastal communities depend on behavior change, social acceptance, and public support of localized mitigation programs. These needs necessitate appropriate and effective stakeholder engagement. Cape Cod, ...

Many of the remaining mechanisms for reducing land-based nitrogen release in coastal communities depend on behavior change, social acceptance, and public support of localized mitigation programs. These needs necessitate appropriate and effective stakeholder engagement. Cape Cod, ...

The shallow aquifer in Southern Willamette Valley has high levels of nitrate-N, and we are exploring the role of geomorphology and historic land use in contributing to this problem. Nitrogen inputs to farmland from fertilizer is thought to be the primary source of nitrogen to the...

CPHEA’s Jana Compton was invited to present to teachers about non-point source pollution and nitrogen management effects on surface and groundwater quality. She is advising teachers in guiding students to identify what local stakeholders can do to address integrated water m...

National water quality standards determine limits to a water quality pollutant that are necessary to ensure protection of ecological and human health conditions. In this article, we apply a structured decision making process to guide watershed managers in meeting national water q...

Regenerative stormwater conveyance (RSC), a relatively new stormwater management approach, is extensively implemented throughout the mid-Atlantic for nutrient control, but little is known of its pollutant reduction capabilities and controlling factors. This study examined effects...

Spanning the border of U.S. and Canada, the Nooksack-Fraser transboundary area (2639 km2) is home to the communities of Lynden, Washington, and Abbotsford, British Columbia, with a strong base in farming, fisheries and outdoor recreation. Balancing these uses is a key issue in t...

Salt marshes may act either as greenhouse gas (GHG) sources or sinks depending on hydrological conditions, vegetation communities, and nutrient availability. In recent decades, eutrophication has emerged as a major driver of change in salt marsh ecosystems. An ongoing fertilizati...