Loss of deep roots limits biogenic agents of soil development that are only partially restored by decades of forest regeneration oleh Sharon A. Billings, Daniel Hirmas, Pamela L. Sullivan, Christoph A. Lehmeier, Samik Bagchi, Kyungjin Min, Zachary Brecheisen, Emma Hauser, Rena Stair, Rebecca Flournoy, Daniel deB. Richter