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
Jiangtao Hong1; Xiaojing Qin1,2; Xingxing Ma3; Xin Xu1,2; Xiaodan Wang1
2019
Source PublicationBiology and Fertility of Soils
ISSN0178-2762
Volume55Issue:8Pages:801–811
Contribution Rank1
Abstract

Using an 15N labelling method (15N-NH4+ and 15N-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 μg 15N g-1 DW root h-1 for S. purpurea and from 2.85 to 7.82 μg 15N 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 μg 15N g-1 DW root h-1 for S. purpurea and from 0.67 to 9.05 μg 15N g-1 DW root h-1 for A. nanschanica. We also observed that 15N recovery was mainly retained in the roots with a smaller proportion of 15N 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
Indexed BySCI
Language英语
Quartile1区
Document Type期刊论文
Identifierhttp://ir.imde.ac.cn/handle/131551/32284
Collection山地表生过程与生态调控重点实验室
Corresponding AuthorXiaodan Wang
Affiliation1.Chinese Acad Sci, Inst Mt Hazards & Environm, 9,Block 4,Renminnanlu Rd, Chengdu 610041, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Shanxi Normal Univ, Coll Urban & Environm Sci, Linfen 041000, Shanxi, Peoples R China
First Author Affilication中国科学院水利部成都山地灾害与环境研究所
Corresponding 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
Jiangtao Hong,Xiaojing Qin,Xingxing Ma,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 Jiangtao Hong,Xiaojing Qin,Xingxing Ma,Xin Xu,&Xiaodan Wang.(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 Jiangtao Hong,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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