IMHE OpenIR  > 山地表生过程与生态调控重点实验室
Seasonal shifting in the absorption pattern of alpine species for NO3- and NH4+ on the Tibetan Plateau
Hong Jiangtao1; Qin Xiaojing1,2; Ma Xingxing3; Xu Xin1,2; Wang Xiaodan1
2019
Source PublicationBIOLOGY AND FERTILITY OF SOILS
ISSN0178-2762
EISSN1432-0789
Volume55Issue:8Pages:801-811
SubtypeArticle
Contribution Rank1
AbstractUsing an N-15 labelling method (N-15-NH4+ and N-15-NO3-) we conducted a time series experiment of N absorption for two common plant species (Stipa purpurea and Artemisia nanschanica) in three seasons (summer late autumn and early spring) in a semi-arid alpine steppe ecosystem on the Tibetan Plateau. The soil NO3- content was significantly higher than the exchangeable NH4+ content in summer whereas exchangeable NH4+ was the dominant inorganic form of N during the cold seasons (late autumn and early spring). Both S. purpurea and A. nanschanica showed a preference for NO3- in summer. The uptake rates of NO3- ranged from 1.09 to 3.94 mu g N-15 g(-1) DW root h(-1) for S. purpurea and from 2.85 to 7.82 mu g N-15 g(-1) DW root h(-1) for A. nanschanica. In contrast both species showed a clear preference for NH4+ during the late autumn and early spring which was strongly dependent on snowfall events. The uptake rate of NH4+ ranged from 0.33 to 4.25 mu g N-15 g(-1) DW root h(-1) for S. purpurea and from 0.67 to 9.05 mu g N-15 g(-1) DW root h(-1) for A. nanschanica. We also observed that N-15 recovery was mainly retained in the roots with a smaller proportion of N-15 stored in the shoots across all seasons. The seasonal shift in the pattern of N absorption may be influenced by changes in the ratios of soil exchangeable NH4+ to NO3- in the different seasons. This finding offers valuable insights into the nutrient acquisition strategies of alpine plants and provides an important mechanism for the temporal pattern of N utilisation by plants in alpine environments.
KeywordNitrogen uptake Nitrogen forms Nitrogen recovery Seasonal variation Alpine steppe
DOI10.1007/s00374-019-01392-5
Indexed BySCI
Language英语
WOS IDWOS:000494475700005
Citation statistics
Document Type期刊论文
Identifierhttp://ir.imde.ac.cn/handle/131551/32297
Collection山地表生过程与生态调控重点实验室
Affiliation1.Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, No. 9, Block 4, Renminnanlu Road, Chengdu 610041, China;
2.University of Chinese Academy of Sciences, Beijing 100049, China;
3.College of Urban and Environment Sciences, Shanxi Normal University, Linfen 041000, China
First Author Affilication中国科学院水利部成都山地灾害与环境研究所
Recommended Citation
GB/T 7714
Hong Jiangtao,Qin Xiaojing,Ma Xingxing,et al. Seasonal shifting in the absorption pattern of alpine species for NO3- and NH4+ on the Tibetan Plateau[J]. BIOLOGY AND FERTILITY OF SOILS,2019,55(8):801-811.
APA Hong Jiangtao,Qin Xiaojing,Ma Xingxing,Xu Xin,&Wang Xiaodan.(2019).Seasonal shifting in the absorption pattern of alpine species for NO3- and NH4+ on the Tibetan Plateau.BIOLOGY AND FERTILITY OF SOILS,55(8),801-811.
MLA Hong Jiangtao,et al."Seasonal shifting in the absorption pattern of alpine species for NO3- and NH4+ on the Tibetan Plateau".BIOLOGY AND FERTILITY OF SOILS 55.8(2019):801-811.
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