Soil net nitrogen mineralisation across global grasslands
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Author/sRisch, A. C.; Zimmermann, S.; Ochoa-Hueso, Raúl; Schutz, M.; Frey, B.; Firn, F.L.; Fay, P. A.; Hagedorn, F.; Borer, E.T.; Seabloom, E.W.; Harpole, W.S.; Knops, J.M.H.; McCulley, R.L.; Broadbent, A.A.D.; Stevens, C.J.; Silveira, M.L.; Adler, P.B.; Baez, S.; Biederman, L.A.; Blair, JM; Brown, C.S.; Caldeira, M.C.; Collins, S.L.; Daleo, P.; di Virgilio, A.; Ebeling, A.; Eisenhauer, N.; Esch, E.; Eskelinen, A.; Hagenah, N.; Hautier, Y.; Kirkman, K.P.; MacDougall, A.S.; Moore, J.L.; Power, S. A.; Prober, S.M.; Roscher, C.; Sankaran, M.; Siebert, J.; Speziale, K.L.; Tognetti, P.M.; Virtanen, R.; Yahdjian, L.; Moser, B.
SourceNature Communications volume 10, Article number: 4981 (2019)
Soil nitrogen mineralisation (N-min), the conversion of organic into inorganic N, is important for productivity and nutrient cycling. The balance between mineralisation and immobilisation (net N-min) varies with soil properties and climate. However, because most global-scale assessments of net N-min are laboratory-based, its regulation under field-conditions and implications for real-world soil functioning remain uncertain. Here, we explore the drivers of realised (field) and potential (laboratory) soil net N-min across 30 grasslands worldwide. We find that realised N-min is largely explained by temperature of the wettest quarter, microbial biomass, clay content and bulk density. Potential N-min only weakly correlates with realised N-min, but contributes to explain realised net N-min when combined with soil and climatic variables. We provide novel insights of global realised soil net N-min and show that potential soil net N-min data available in the literature could be parameterised with soil and climate data to better predict realised N-min.