Evidence for nitrogen accumulation: the total nitrogen budget of the terrestrial biosphere of a lowland agricultural catchment

Abstract

(2015) 'Evidence for nitrogen accumulation : the total nitrogen budget of the terrestrial biosphere of a lowland agricultural catchment. ', Biogeochemistry., 123 (3).pp. 411-428. Further information on publisher's website:http://dx.doi.org/10.1007/s10533-015-0074-7Publisher's copyright statement:The nal publication is available at Springer via http://dx.doi.org/10.1007/s10533-015-0074-7.Additional information: Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. Several national-scale studies have shown that reactive N is accumulating in 12 developed countries even when only the terrestrial biosphere is considered. However, 13 none of these studies was able to consider the total N budget and so any discrepancy 14 in budgets could be dismissed as being accounted for by N 2 exchange. This study 15 considered a large (9948 km

Development of regional pollution export coefficients based on artificial rainfall experiments and its application in North China

“…Contrary to previously reported results suggesting a uniform export coefficient over whole regions (Wu et al 2012;Worrall et al 2015), the export coefficients for the same land use in this study varied between different areas. The export coefficient values were related to the spatial variety of land use, average rainfall-runoff coefficient and precipitation.…”

Microbiological Confinement of Two Adjacent Water Wells in Lake Karla Basin, Greece

“…However, Sidiropoulos [37] suggests that the increased salinity in the basin's groundwater is mostly due to leaching of salts from the fertilized agricultural land. It has been shown that nitrogen fertilizers applied to crops can stay in the soil and leach out as nitrate to subsurface waters for several decades following their application [38,39]. The increased salinity of Lake Karla water due to such application of fertilizers for several decades prior to its reconstruction might have led to the occurrence of salt tolerant protists and algae during the first years of the Lake's refilling [40].…”

Legacy Nutrient Dynamics at the Watershed Scale: Principles, Modeling, and Implications

“…Studies also demonstrated a growing N saturation responds to excessive N inputs in many highly managed watersheds Tessier and Raynal, 2003). Therefore, many N balance studies conducted in many countries and regions (Chen et al, 2014a;Drury et al, 2011;Van Meter et al, 2016;Worrall et al, 2015) suggested a very large and ongoing storage of N in terrestrial ecosystem. In terms of P, studies conducted for many watersheds across China, United States, and Europe (Chen et al, 2015b;Goyette et al, 2016;Han et al, 2012;Hong et al, 2012;Russell et al, 2008) indicated that synthetic fertilizer application and food and feed import are major sources for total anthropogenic P inputs over the past several years to decades.…”

“…The variable hydrologic and biogeochemical residence times in different landscapes along the terrestrial-aquatic continuum give rise to distinct spatial and temporal patterns of legacy nutrient pools (Chen et al, 2014a;Sharpley et al, 2013). Legacy N hot spots always occur in large watersheds with longer time for groundwater updates and areas with longer time for N biogeochemical cycling (Worrall et al, 2015). The delivery of inorganic form N pool by hydrological pathway is mainly via slower flows, and the relatively long residence time will result in long-term N accumulation in vadose zone and groundwater (Costa et al, 2002;Scanlon et al, 2008).…”

“…Accumulation of N in vadose zone is commonly observed in arid or semiarid region with high N surplus due to low carbon content, strong mineralization and nitrification abilities, and weak immobilization and denitrification abilities (Scanlon et al, 2008;Walvoord et al, 2003;Zhou et al, 2016). In many humid regions, nitrate would further (Puckett et al, 2011;Qi et al, 2011), Europe (39% of monitoring stations exceeded 25 mg L À1 ) (Angelopoulos et al, 2009;Worrall et al, 2015), India (average concentration exceeded 50 mg L À1 in northern India) (Suthar et al, 2009), and China (28% exceeded 10 mg L À1 ) (Gu et al, 2013;Ju et al, 2004). Although ammonia leaching is usually limited along the soil profile, increasing evidences indicated that leaching from landfills and septic tanks or other sewage disposal plants has resulted in a considerable ammonia accumulation in groundwater, presenting a high potential for storing ammonia in residential groundwater (Umezawa et al, 2009).…”