Swiss Federal Institute for Forest, Snow and Landscape Research WSL, Zuercherstrasse 111, 8903, Birmensdorf, Switzerland.
Department of Biology, IVAGRO, University of Cádiz, Campus de Excelencia Internacional Agroalimentario (ceiA3), Campus Rio San Pedro, 11510, Puerto Real, Cádiz, Spain.
Nat Commun. 2019 Oct 31;10(1):4981. doi: 10.1038/s41467-019-12948-2.
Soil nitrogen mineralisation (N), the conversion of organic into inorganic N, is important for productivity and nutrient cycling. The balance between mineralisation and immobilisation (net N) varies with soil properties and climate. However, because most global-scale assessments of net N 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 across 30 grasslands worldwide. We find that realised N is largely explained by temperature of the wettest quarter, microbial biomass, clay content and bulk density. Potential N only weakly correlates with realised N, but contributes to explain realised net N when combined with soil and climatic variables. We provide novel insights of global realised soil net N and show that potential soil net N data available in the literature could be parameterised with soil and climate data to better predict realised N.
土壤氮矿化（N），即将有机氮转化为无机氮，对生产力和养分循环很重要。矿化和固定（净 N）之间的平衡随土壤特性和气候而变化。然而，由于大多数全球尺度的净 N 评估都是基于实验室的，因此其在田间条件下的调控及其对现实土壤功能的影响仍不确定。在这里，我们研究了全球 30 个草地中实现（田间）和潜在（实验室）土壤净 N 的驱动因素。我们发现，实现的 N 主要由最湿润季度的温度、微生物生物量、粘粒含量和土壤容重解释。潜在的 N 与实现的 N 相关性较弱，但与土壤和气候变量结合后，有助于解释实现的净 N。我们提供了全球实现土壤净 N 的新见解，并表明文献中可用的潜在土壤净 N 数据可以用土壤和气候数据进行参数化，以更好地预测实现的 N。
