Human‐induced environmental changes are altering forest productivity and species composition, significantly impacting tree physiology, growth, water uptake, and nutrient acquisition. Investigating the intricate interplay between plant physiology and environmental shifts, we analyzed tree‐ring isotopes (δ 13 C, δ 18 O, and δ 15 N) to track long‐term trends in intrinsic water‐use efficiency (iWUE) and nitrogen availability for E...

Chronic nitrogen inputs can alleviate N limitation and potentially impose N losses in forests, indicated by soil enrichment in 15 N over 14 N. However, the complexity of the nitrogen cycle hinders accurate quantification of N fluxes. Simultaneously, soil ecologists are striving to find meaningful indicators to characterise the “openness” of the nitrogen cycle. We integrate soil δ 15 N with constrained ecosystem N losses and th...

Dissolved organic carbon ( DOC ) concentrations in surface waters have increased across much of E urope and N orth A merica, with implications for the terrestrial carbon balance, aquatic ecosystem functioning, water treatment costs and human health. Over the past decade, many hypotheses have been put forward to explain this phenomenon, from changing climate and land management to eutrophication and acid deposition. Resolution...

Sulphur ( S ) and nitrogen ( N ) deposition are important drivers of the terrestrial carbon ( C ) and N cycling. We analyzed changes in C and N pools in soil and tree biomass at a highly acidified spruce site in the C zech R epublic during a 15 year period. Total S deposition decreased from 5 to 1.1 g m −2 yr −1 between 1995 and 2009, whereas bulk N deposition did not change. Over the same period, C and N pools in the Oa horiz...