Permafrost nitrogen status and its determinants on the Tibetan Plateau

doi:10.1111/gcb.15205

CORC > 植物研究所 > 中国科学院植物研究所 > 植被与环境变化国家重点实验室

	Permafrost nitrogen status and its determinants on the Tibetan Plateau
	Mao, Chao 1; Kou, Dan 2; Chen, Leiyi ; Qin, Shuqi 1; Zhang, Dianye 1; Peng, Yunfeng ; Yang, Yuanhe 1
刊名	GLOBAL CHANGE BIOLOGY
	2020
卷号	26 期号:9 页码:5290-5302
关键词	climate warming frozen nitrogen nitrogen availability nitrogen cycle nitrogen transformation rates permafrost thaw
ISSN号	1354-1013
DOI	10.1111/gcb.15205
文献子类	Article
英文摘要	It had been suggested that permafrost thaw could promote frozen nitrogen (N) release and modify microbial N transformation rates, which might alter soil N availability and then regulate ecosystem functions. However, the current understanding of this issue is confined to limited observations in the Arctic permafrost region, without any systematic measurements in other permafrost regions. Based on a large-scale field investigation along a 1,000 km transect and a laboratory incubation experiment with a(15)N pool dilution approach, this study provides the comprehensive evaluation of the permafrost N status, including the available N content and related N transformation rates, across the Tibetan alpine permafrost region. In contrast to the prevailing view, our results showed that the Tibetan alpine permafrost had lower available N content and net N mineralization rate than the active layer. Moreover, the permafrost had lower gross rates of N mineralization, microbial immobilization and nitrification than the active layer. Our results also revealed that the dominant drivers of the gross N mineralization and microbial immobilization rates differed between the permafrost and the active layer, with these rates being determined by microbial properties in the permafrost while regulated by soil moisture in the active layer. In contrast, soil gross nitrification rate was consistently modulated by the soilNH4+content in both the permafrost and the active layer. Overall, patterns and drivers of permafrost N pools and transformation rates observed in this study offer new insights into the potential N release upon permafrost thaw and provide important clues for Earth system models to better predict permafrost biogeochemical cycles under a warming climate.
学科主题	Biodiversity Conservation ; Ecology ; Environmental Sciences
电子版国际标准刊号	1365-2486
出版地	HOBOKEN
WOS关键词	INORGANIC NITROGEN ; SOIL-NITROGEN ; CARBON ; THAW ; MINERALIZATION ; NITRIFICATION ; AVAILABILITY ; TEMPERATURE ; BIOMASS ; DEGRADATION
WOS研究方向	Biodiversity & Conservation ; Environmental Sciences & Ecology
语种	英语
出版者	WILEY
WOS记录号	WOS:000544397900001
资助机构	National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [31825006, 31988102, 91837312] ; Second Tibetan Plateau Scientific Expedition and Research [2019QZKK0106, 2019QZKK0302] ; Chinese Academy of SciencesChinese Academy of Sciences [QYZDB-SSW-SMC049]
内容类型	期刊论文
源URL	[http://ir.ibcas.ac.cn/handle/2S10CLM1/21700]
专题	植被与环境变化国家重点实验室
作者单位	1.Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, Beijing 100093, Peoples R China 2.Univ Chinese Acad Sci, Beijing, Peoples R China 3.Univ Eastern Finland, Dept Biol & Environm Sci, Biogeochem Res Grp, Kuopio, Finland
推荐引用方式 GB/T 7714	Mao, Chao,Kou, Dan,Chen, Leiyi,et al. Permafrost nitrogen status and its determinants on the Tibetan Plateau[J]. GLOBAL CHANGE BIOLOGY,2020,26(9):5290-5302.
APA	Mao, Chao.,Kou, Dan.,Chen, Leiyi.,Qin, Shuqi.,Zhang, Dianye.,...&Yang, Yuanhe.(2020).Permafrost nitrogen status and its determinants on the Tibetan Plateau.GLOBAL CHANGE BIOLOGY,26(9),5290-5302.
MLA	Mao, Chao,et al."Permafrost nitrogen status and its determinants on the Tibetan Plateau".GLOBAL CHANGE BIOLOGY 26.9(2020):5290-5302.