The Forgotten Nutrient——The Role of Nitrogen in Permafrost Soils of Northern China

正1.Introduction:permafrost carbon and nitrogen feedback to climate change Permafrost refers to any ground, including soils, sediments and rocks, with a temperature at or below the freezing point of water (0℃) for two or more consecutive years (Biskaborn et al., 2019). Permafrost soils of the Northern Hemisphere store vast amounts of both organic carbon (C) and nitrogen (N)(Tarnocai et al., 2009; Harden et al., 2012; Mueller et al.,