作 者： Kou D, Yang GB, Li F, Feng XH, Zhang DY, Mao C, Zhang QW, Peng YF, Ji CJ, Zhu QA, Fang YT, Liu XY, Xu-Ri, Li SQ, Deng J, Zheng XH, Fang JY, Yang YH*
期刊名称： Nature Communications
影响因子： 12.121
出版年份： 2020
卷 期 号： 11( 1)
页 码： 3331
论文摘要：
The ecosystem carbon (C) balance in permafrost regions, which has a global significance in understanding the terrestrial C-climate feedback, is significantly regulated by nitrogen (N) dynamics. However, our knowledge on temporal changes in vegetation N limitation (i.e., the supply of N relative to plant N demand) in permafrost ecosystems is still limited. Based on the combination of isotopic observations derived from a re-sampling campaign along a ~3000 km transect and simulations obtained from a process-based biogeochemical model, here we detect changes in ecosystem N cycle across the Tibetan alpine permafrost region over the past decade. We find that vegetation N limitation becomes stronger despite the increased available N production. The enhanced N limitation on vegetation growth is driven by the joint effects of elevated plant N demand and gaseous N loss. These findings suggest that N would constrain the future trajectory of ecosystem C cycle in this alpine permafrost region.
原文链接：https://www.nature.com/articles/s41467-020-17169-6.pdf