Change in nitrogen availability of northern peatlands and its effect on carbon sink function

doi:10.13287/j.1001-9332.202210.008

Abstract

Abstract: Northern peatlands are typical nitrogen-limited ecosystems, which are sensitive to global climate change and human activities. The increases of endogenous available nitrogen caused by climate warming and exogenous nitrogen input caused by human activities changed the nitrogen availability of northern peatlands, and would affect carbon and nitrogen cycling and carbon sink function of peatland. Here, we review the influence factors of carbon accumulation rate and carbon sink function in northern peatlands. The effects of nitrogen deposition, freezing and thawing, fire and other factors on nitrogen availability of northern peatlands were reviewed. The responses of plants and soil microorganisms to changes in nitrogen availability were elaborated from carbon fixation and carbon emission processes, respectively. The research related to carbon sink function of peat ecosystems under the influence of glo-bal change was prospected, aiming to help the implementation of the ‘double carbon' goal.

Key words: nitrogen deposition, peatland, carbon sink, freezing and thawing, fire

GAO Jin-li, SONG Yan-yu, SONG Chang-chun, GONG Chao, MA Xiu-yan, GAO Si-qi, LIU Zhen-di. Change in nitrogen availability of northern peatlands and its effect on carbon sink function[J]. Chinese Journal of Applied Ecology, 2022, 33(10): 2663-2669.

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