“…Compared with the well‐known geographic patterns in the diversity and abundance of aboveground organisms (Hillebrand, 2004; Mannion, Upchurch, Benson, & Goswami, 2014), the geographic patterns of belowground organisms are relatively understudied (but see Decaëns, 2010; Hendershot, Read, Henning, Sanders, & Classen, 2017; Maraun, Schatz, & Scheu, 2007). Because of the important interactions between aboveground and belowground processes, a better understanding of geographic patterns of belowground organisms is needed (Fierer, Strickland, Liptzin, Bradford, & Cleveland, 2009; Lu, He, Ding, & Siemann, 2018; van der Putten, 2012; Wilschut et al, 2019), especially in light of multiple global change factors (Bardgett & Wardle, 2010; Coyle et al, 2017) that may perturb both aboveground and belowground communities.…”