Long-Term Effects of High Nitrogen Loads on Cation and Carbon Riverine Export in Agricultural Catchments
作者： Luc Aquilina , Anne Poszwa , Christian Walter , Virginie Vergnaud , Anne-Catherine Pierson-Wickmann
DOI: 10.1021/ES301715T
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摘要: The intensification of agriculture in recent decades has resulted extremely high nitrogen inputs to ecosystems. One effect been H+ release through NH4+ oxidation soils, which increases rock weathering and leads acidification processes such as base-cation leaching from the soil exchange complex. This study investigated evolution cation concentrations over past 50 years rivers Armorican crystalline shield (Brittany, western France). On a regional scale, increased riverine exports (Ca2+, Mg2+, Na+, K+) correlated with NO3– concentration. estimated increase is 0.7 mmol(+)/L for Ca2+ + Mg2+ 0.85 total cations. According mass balance, loss represents >30% capacity soils. Long-term thus contributes decline productivity. Estimates organic annually produced worldwide indicate that may also con...
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