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Biology and Fertility of Soils

, Volume 53, Issue 7, pp 729–735 | Cite as

Nitrogen uptake pattern of herbaceous plants: coping strategies in altered neighbor species

  • Jiangtao Hong
  • Xingxing Ma
  • Xiaoke Zhang
  • Xiaodan WangEmail author
Short Communication
  • 322 Downloads

Abstract

The mechanisms for maintaining the species diversity of plant communities under conditions of resource limitation is an important subject in ecology. How interspecific relationships influence the pattern of nutrient absorption by coexisting species in N-limited ecosystems is still disputed. We investigated the effect of neighbor species on the uptake of inorganic and organic N by three common plant species using 15N tracer techniques in a semi-arid alpine steppe on the northern Tibet. The results showed that the plant species varied in their capacity to absorb NO3 -N, NH4 +-N, and glycine-N with or without neighbor species. Carex moorcroftii and Leontopodium nanum showed much more plasticity in resource utilization than Stipa purpurea when neighbor species were present. When C. moorcroftii and S. purpurea coexisted, they all increased their 15N uptake for the NO3 -N (C. moorcroftii 2.2-fold increase and S. purpurea 2.2-fold increase) and glycine-N treatments (C. moorcroftii 2.9-fold increase and S. purpurea 3.4-fold increase), which indicated that neighborhood had a positive effect for N absorption between the two species. However, L. nanum was a less effective competitor for N utilization than the neighbor species across almost all treatments. The dominant species appeared to have an inhibitory effect on N absorption by the accompanying species in this alpine steppe environment. Thus, interspecific neighbor pairs may result in both a mutually beneficial cooperative relationship and a competitive relationship among neighbors in resource use patterns in extreme environments. Resource use plasticity in altered neighbor species may be due to phenotypic plasticity based on the conditions of the realized niche, offering a valuable insight into niche complementarity and providing a general and important mechanism for resource partitioning in an alpine area.

Keywords

Nitrogen uptake Nitrogen forms Neighbor removals Niche complementarity Species coexistence 

Notes

Acknowledgements

This research was supported by the State Key Research Development Program of China (Grant No. 2016YFC0502002), the 135 key cultivation program of the Institute of Mountain Hazards and Environment (2017-2020), and the Young Foundation of Institute of Mountain Hazard and Environment (2017-2018).

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Copyright information

© Springer-Verlag GmbH Germany 2017

Authors and Affiliations

  • Jiangtao Hong
    • 1
  • Xingxing Ma
    • 2
  • Xiaoke Zhang
    • 3
  • Xiaodan Wang
    • 1
    Email author
  1. 1.Institute of Mountain Hazards and EnvironmentChinese Academy of SciencesChengduChina
  2. 2.College of Urban and Environment SciencesShanxi Normal UniversityLinfenChina
  3. 3.School of Public AdministrationHohai UniversityNanjingChina

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