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Vadose zone flushing of fertilizer tracked by isotopes of water and nitrate.
Vadose Zone J
May 2024
Groundwater Characterization and Remediation Division, US Environmental Protection Agency, Ada, Oklahoma, USA.
A substantial fraction of nitrogen (N) fertilizer applied in agricultural systems is not incorporated into crops and moves below the rooting zone as nitrate (NO ). Understanding mechanisms for soil N retention below the rooting zone and leaching to groundwater is essential for our ability to track the fate of added N. We used dual stable isotopes of nitrate ( N-NO and O-NO ) and water ( O-HO and H-HO) to understand the mechanisms driving nitrate leaching at three depths (0.
View Article and Find Full Text PDFInfluence of kinetic air-water interfacial partitioning on unsaturated transport of PFAS in sandy soils.
Sci Total Environ
December 2024
Civil & Environmental Engineering Department, Hydrologic Science and Engineering Program, Hydrologic Science & Engineering Program, ReNuWit-The Urban Water Engineering Research Center, Colorado School of Mines, Golden, CO 80401, USA. Electronic address:
Article Synopsis
- - This study explores how kinetic air-water partitioning influences the movement of PFAS (perfluoroalkyl substances) in sandy soil, particularly under dynamic unsaturated flow situations.
- - Short-chain PFAS act like conservative tracers with minimal partitioning, whereas longer-chain PFAS show non-equilibrium behavior, and the presence of air-water interfaces significantly affects their transport.
- - The research highlights that considering kinetic partitioning processes can more than double the mass flux of PFOS to groundwater, indicating a major impact on PFAS concentrations in porewater.
Isotopic and Geophysical Investigations of Groundwater in Laiyuan Basin, China.
Sensors (Basel)
October 2024
Institute of Hydrogeology and Environmental Geology, Chinese Academy of Geological Sciences, Shijiazhuang 050061, China.
Due to the complex intersection and control of multiple structural systems, the hydrogeological conditions of the Laiyuan Basin in China are complex. The depth of research on the relationship between geological structure and groundwater migration needs to be improved. The supply relationship of each aquifer is still uncertain.
View Article and Find Full Text PDFImpact scenarios on groundwater availability of southern Italy by joint application of regional climate models (RCMs) and meteorological time series.
Sci Rep
November 2024
Department of Earth, Environmental and Resource Sciences (DiSTAR), University of Naples Federico II, 80126, Naples, Italy.
Nowadays the phenomenon of global warming is unequivocal, as confirmed by the latest reports of the IPCC and studies of the climate-change impacts on ecosystems, global economy, and populations. The effect of climate change on groundwater is a very relevant task especially for regions dependent chiefly on groundwater availability, as for the southern Italy. In such a territorial framework, to achieve a detailed hydro-climatological characterization, an Ensemble of 15 RCMs (E15) derived from the EURO-CORDEX project was analyzed considering two IPCC Representative Concentration Pathways (RCP4.
View Article and Find Full Text PDFEnvironmental effects and spatial inequalities of paddy field utilization are increasing in China.
J Environ Manage
November 2024
College of Land Science and Technology, China Agricultural University, Beijing, 100193, China. Electronic address:
Understanding the spatiotemporal dynamics of the environmental effects associated with paddy field utilization (PFU) is imperative for safeguarding the availability of food while preserving the environment. While thorough investigations have been carried out on the individual environmental effects of PFU, study on comprehensive environmental effects of PFU and the spatial inequity issues stemming from the transfer of these effects are scarce. This study aims to quantify the greenhouse gas emissions (GHGE), nitrogen emissions (NE), and water consumption (WC) linked to PFU in China from 2000 to 2020.
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