Nitrate Legacy in a Tropical and Complex Fractured Volcanic Aquifer System

Sánchez-Gutiérrez, Rolando; Sánchez‐Murillo, Ricardo; Esquivel‐Hernández, Germain; Birkel, Christian; Boll, Jan; Rojas‐Jiménez, L. D.; Castro‐Chacón, Laura

doi:10.1029/2023jg007554

Cited by 5 publications

(1 citation statement)

References 88 publications

(171 reference statements)

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“…The application of mineral fertilizers increased rapidly in Europe and North America after World War II (Krausmann et al, 2013;, which resulted in increased food production at the cost of polluting surface and groundwater (Haygarth et al, 2014;Ilampooranan et al, 2019). The adverse effects on water quality of the application of nutrients were first recognized in Western European countries (Rivett et al, 2008;Smith et al, 2017;Sabo et al, 2019;Sanchez et al, 2023). For example, 80% of European surface waters exceeded the European Commission's drinking water standard (50 mg NO 3 L -1 ) (Molénat and Gascuel Odoux, 2002).…”

Section: Introductionmentioning

confidence: 99%

Long-term trajectories of nutrient budgets and changes in soils of two counties with contrasting land use changes: cereals vs fruit orchards

Wang,

Yu,

Xia

et al. 2024

Preprint

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Land use change (LUC) is a key factor affecting nutrient budgets in agricultural soils. Comparing the long-term trajectories of nutrient budgets and changes in soils at a regional scale with contrasting LUC is critical to optimizing nutrient management and minimizing adverse environmental effects. We investigated the nutrient budgets and changes in soils in two counties in the south Loess Plateau, China, with contrasting LUCs from 1992 to 2017. Wugong County has cereals as the main crop, whereas Meixian County has the main cereal crops changed to kiwi orchards. We found that nitrogen (N), phosphorus (P), and potassium (K) inputs in two counties increased rapidly, and the nutrient outputs by crop harvests remained relatively stable. This resulted in increasing nutrient surpluses in the soils of two counties. Nutrient surplus in the orchard-dominated county was higher than that of the cereal-dominated county, and nutrient use efficiencies were contrasting. High N surplus in the orchard-dominated county resulted in high nitrate-N accumulation in deeper soil profiles of orchards. High P and K surpluses in the two counties significantly increased available P and K in 0-20 cm depth. Soil available P and K in the orchard-dominated county were significantly higher than in the cereal-dominated county, which was also significantly higher than the threshold values of available P and K contents in soils. We conclude that comprehensive measures should be taken to control nutrient surpluses, which will help to balance nutrient inputs and outputs and minimize nutrient losses in intensive horticultural crop systems.

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Section: Introductionmentioning

confidence: 99%

Long-term trajectories of nutrient budgets and changes in soils of two counties with contrasting land use changes: cereals vs fruit orchards

Wang,

Yu,

Xia

et al. 2024

Preprint

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Tracing Urban Drinking Water Sources: Global State of the Art and Insights From an IAEA‐Coordinated Research Project

Sánchez‐Murillo,

Ortega,

Vreča

et al. 2024

Hydrological Processes

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Climate change, inter‐annual precipitation variability, recurrent droughts and flash flooding, coupled with increasing water needs, are shaping the co‐evolution of socioeconomic and cultural assemblages, water laws and regulations, and equitable drinking water access and allocation worldwide. Recognising the need for mitigation strategies for drinking water availability in urban areas, the Isotope Hydrology Section of the International Atomic Energy Agency (IAEA) coordinated a state‐of‐the‐art global assessment to evaluate water sources and distribution of drinking water supply in urban centres, an initiative entitled ‘Use of Isotope Techniques for the Evaluation of Water Sources for Domestic Supply in Urban Areas (2018–2023)’. Here, we report on (a) current research trends for studying urban drinking water systems during the last two decades and (b) the development, testing and integration of new methodologies, aiming for a better assessment, mapping and management of water resources used for drinking water supply in urban settings. Selected examples of water isotope applications (Canada, USA, Costa Rica, Ecuador, Morocco, Botswana, Romania, Slovenia, India and Nepal) provide context to the insights and recommendations reported and highlight the versatility of water isotopes to underpin seasonal and temporal variations across various environmental and climate scenarios. The study revealed that urban areas depend on a large spectrum of water recharge across mountain ranges, extensive local groundwater extraction and water transfer from nearby or distant river basins. The latter is reflected in the spatial isotope snapshot variability. High‐resolution monitoring (hourly and sub‐hourly) isotope sampling revealed large diurnal variations in the wet tropics (Costa Rica) (up to 1.5‰ in δ18O) and more uniform diurnal variations in urban centres fed by groundwater sources (0.08‰ in δ18O) (Ljubljana, Slovenia). Similarly, while d‐excess was fairly close to the global mean value (+10‰) across all urban centres (10‰–15‰), reservoir‐based drinking water systems show lower values (up to ~ −20‰) (Arlington, TX, USA and Gaborone, Botswana), as a result of strong evapoconcentration processes. δ18O time series and depth‐integrated sampling highlighted the influence of the catchment damping ratio in the ultimate intake water composition. By introducing new, traceable spatial and temporal tools that span from the water source to the end‐user and are linked to the engineered and socio‐economic structure of the water distribution system, governmental, regional or community‐based water operators and practitioners could enhance drinking water treatment strategies (including more accurate surface water blending estimations) and improve urban water management and conservation plans in the light of global warming.

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Update on Our Action Plan for Equity, Inclusion, and Diversity in Publishing at JGR: Biogeosciences

et al. 2023

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We made a commitment to better include underrepresented members of our community in the publication pipeline of JGR: Biogeosciences. This commitment consists of regular updates on our policies and practices, and concrete actions we intend to implement over the next year. So far, our progress to tackle biases and ensure equitable research in the biogeosciences has focused on improving diversity of our associate editor and reviewer pools, increasing awareness of unconscious bias in peer‐review, and promoting inclusion in global collaborations. In this update, we explore manuscript submissions and manuscript decisions by gender, and we present a pilot that aims to promote ethical and equitable global collaborations in resource‐poor settings. We end our editorial by presenting our next set of actions that we plan on completing over the next year, which include a more thorough analysis of reviewer demographics.

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Nitrate Legacy in a Tropical and Complex Fractured Volcanic Aquifer System

Cited by 5 publications

References 88 publications

Long-term trajectories of nutrient budgets and changes in soils of two counties with contrasting land use changes: cereals vs fruit orchards

Long-term trajectories of nutrient budgets and changes in soils of two counties with contrasting land use changes: cereals vs fruit orchards

Tracing Urban Drinking Water Sources: Global State of the Art and Insights From an IAEA‐Coordinated Research Project

Update on Our Action Plan for Equity, Inclusion, and Diversity in Publishing at JGR: Biogeosciences

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