Soil net nitrogen mineralisation across global grasslands

作者：Anita C. Risch, Stephan Zimmermann, Raúl Ochoa‐Hueso, M. Schütz, Beat Frey, Jennifer Firn, Philip A. Fay, Frank Hagedorn, Elizabeth T. Borer, Eric W. Seabloom, W. Stanley Harpole, Johannes M. H. Knops, Rebecca L. McCulley, Arthur A. D. Broadbent, Carly Stevens, Maria L. Silveira, Peter B. Adler, Selene Báez, Lori Biederman, John M. Blair, Cynthia S. Brown, Maria C. Caldeira, Scott L. Collins, Pedro Daleo, A. di Virgilio, Anne Ebeling, Nico Eisenhauer, Ellen Esch, Anu Eskelinen, Nicole Hagenah, Yann Hautier, Kevin Kirkman, Andrew S. MacDougall, Joslin L. Moore, Sally A. Power, Suzanne M. Prober, Christiane Roscher, Mahesh Sankaran, Julia Siebert, Karina L. Speziale, Pedro M. Tognetti, Risto Virtanen, Laura Yahdjian, Barbara Moser · 发表于：Nature Communications · 年份：2019 · DOI：10.1038/s41467-019-12948-2 · 被引用次数：148 · 研究领域：Soil Carbon and Nitrogen Dynamics、Peatlands and Wetlands Ecology、Soil erosion and sediment transport

Abstract 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 .