caa a22 4500 605517029 CHVBK 20210128100717.0 cr unu---uuuuu 210128e20150401xx s 000 0 eng 10.1007/s10533-015-0074-7 doi (NATIONALLICENCE)springer-10.1007/s10533-015-0074-7 Evidence for nitrogen accumulation: the total nitrogen budget of the terrestrial biosphere of a lowland agricultural catchment [Elektronische Daten] [F. Worrall, N. Howden, T. Burt] Several national-scale studies have shown that reactive N is accumulating in developed countries even when only the terrestrial biosphere is considered. However, none of these studies was able to consider the total N budget and so any discrepancy in budgets could be dismissed as being accounted for by N2 exchange. This study considered a large (9,948km2), mixed agricultural catchment where records of N flux, land use, climate and population go back at least to 1883. The N inputs were: biological nitrogen fixation, food and feed transfers, atmospheric deposition and inorganic fertilizers. The N outputs were atmospheric emissions (NH3, N2O, NO, N2), direct waste losses and fluvial losses at the soil source. The results showed that, prior to the large-scale use of inorganic fertilizers, the total N budget of the catchment was at steady state with only a small net loss of total N. After the widespread introduction of inorganic fertilizers, the balance of the catchment shifts in favour of the net accumulation. Even accounting for losses to groundwater, the catchment was found to have accumulated 315ktonnes N (315tonnes/km2) at a rate of 5.5tonnes N/km2/yr (55kgN/ha/yr) over 35years since 1973. We propose that the accumulation of N could be occurring in subsoils of the catchment. Springer International Publishing Switzerland, 2015 Total N nationallicence N2 nationallicence Fluvial nitrogen nationallicence Nitrate nationallicence Worrall F. Department of Earth Sciences, Science Laboratories, South Road, DH1 3LE, Durham, UK aut Howden N. Department of Civil Engineering, University of Bristol, Queen's Building, University Walk, BS8 1TR, Bristol, UK aut Burt T. Department of Geography, Science Laboratories, South Road, DH1 3LE, Durham, UK aut Biogeochemistry Springer International Publishing 123/3(2015-04-01), 411-428 0168-2563 123:3<411 2015 123 10533 https://doi.org/10.1007/s10533-015-0074-7 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s10533-015-0074-7 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Worrall F. Department of Earth Sciences, Science Laboratories, South Road, DH1 3LE, Durham, UK aut NATIONALLICENCE 700 1- Howden N. Department of Civil Engineering, University of Bristol, Queen's Building, University Walk, BS8 1TR, Bristol, UK aut NATIONALLICENCE 700 1- Burt T. Department of Geography, Science Laboratories, South Road, DH1 3LE, Durham, UK aut NATIONALLICENCE 773 0- Biogeochemistry Springer International Publishing 123/3(2015-04-01), 411-428 0168-2563 123:3<411 2015 123 10533