This work reviews applications of stable isotope analysis to the studies of transport and
transformation of N species in groundwater under agricultural areas. It summarizes evidence …

Nitrogen is a requisite and highly demanded element for living organisms on Earth.
However, increasing human activities have greatly altered the global nitrogen cycle …

Though urban areas represent a small fraction of global land cover, they have an outsized
impact on hydrological processes. Within these areas, the pathways that water follows are …

Quantitative estimation for tracking the transport of various nitrate sources is required to
effectively manage nitrate loading in complex river systems. In this study, we validated an …

Optimising nitrogen (N) fertilisation is critically important for obtaining high crop yields with
low environmental costs. A seven-year field experiment was conducted to evaluate the …

Urban ecosystems are constantly evolving, and they are expected to change in both space
and time with active management or degradation. An urban watershed continuum …

Identifying the sources of reactive nitrogen (N) and quantifying their contributions to
groundwater nitrate concentrations are critical to understanding the dynamics of …

Drinking water maximum contaminant levels (MCL) are established by the US EPA to protect
human health. Since 1975, US public water suppliers have reported MCL violations to the …

Remediation of nitrate pollution of Earth's rivers and aquifers is hampered by cumulative
biogeochemical processes and nitrogen sources. Isotopes (δ 15N, δ 18O) help unravel …

Human-dominated land uses can increase transport of major ions in streams due to the
combination of human-accelerated weathering and anthropogenic salts. Calcium …