Contribution of acidification and eutrophication to declines in species richness of calcifuge grasslands along a gradient of atmospheric nitrogen deposition

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Soil acidification exerts a greater control on soil respiration than soil nitrogen availability in grasslands subjected to long‐term nitrogen enrichment (2016, background): “Detrimental outcomes include the loss of biological diver- sity (Bobbink et al. 2010), N saturation and N export (Vitousek et al. 1997), and eutrophication (Stevens et al. 2010).”
Nitrogen enrichment alters plant N: P stoichiometry and intensifies phosphorus limitation in a steppe ecosystem (2017, background): “Meanwhile, long-term atmospheric N deposition has lead to widespread soil acidification, which may increase soil P availability and thereby indirectly alleviate P limitation (Galloway et al., 2008; Stevens et al., 2010).”
Global evidence on nitrogen saturation of terrestrial ecosystem net primary productivity (2016, background): “This may be due to that low soil pH benefits soil P availability (Fujita et al 2010, Stevens et al 2010), further intensifying soil N limitation.”
Direct and indirect effects of nitrogen deposition on species composition change in calcareous grasslands (2011, result): “These findings, using a different method of analysis, are consistent with earlier studies of acid grasslands in which negative effects of soil acidity on herb species numbers were recorded (e.g. Stevens et al., 2006; Duprè et al., 2010; Stevens et al., 2010).”