Annals of Forest Science

, 74:70 | Cite as

Shrubs facilitate recruitment of Caragana stenophylla Pojark: microhabitat amelioration and protection against herbivory

  • Li-Na Xie
  • Hong-Yu Guo
  • Zhe Liu
  • Christopher A. Gabler
  • Wei-Zhong Chen
  • Song Gu
  • Cheng-Cang Ma
Original Paper

Abstract

Key message

Mature Caragana stenophylla shrubs facilitated intraspecific sapling establishment by two mechanisms: microhabitat amelioration and protection against herbivory. Facilitation was mediated by climate, grazing, and sapling age.

Context

Pre-existing shrubs could facilitate sapling establishment of woody plants; however, how these facilitation vary across abiotic and biotic stress gradients and the underlying mechanisms remain unclear.

Aims

The aim of this study is understanding the facilitation of shrub on sapling establishment and how the two underlying mechanisms, microhabitat amelioration and protection against herbivory, vary across climatic aridity gradients, grazing gradients, and sapling age.

Methods

We conducted field sowing experiments to examine the facilitation of mature Caragana stenophylla Pojark on intraspecific sapling establishment.

Results

Facilitation of C. stenophylla on sapling survival increased as drought stress, grazing intensity, and sapling age increased. Microhabitat amelioration increased as drought stress and sapling age increased. Similarly, protection against herbivory increased as drought stress, grazing intensity, and sapling age increased. Relative importance of microhabitat amelioration increased as drought stress increased, and relative importance of protection against herbivory increased as grazing intensity and sapling age increased.

Conclusion

Facilitation of shrub on sapling establishment involves both microhabitat amelioration and protection against herbivory. Facilitation, the two mechanisms, and relative importance between the two mechanisms would all be affected by climatic aridity, grazing intensity, and sapling age. Shrub establishment has a positive feedback effect.

Keywords

Climatic aridity gradient Grazing Sapling establishment Nurse plants Plant facilitation efficiency Stress gradient hypothesis 

Supplementary material

13595_2017_668_MOESM1_ESM.docx (358 kb)
ESM 1(DOCX 357 kb)
13595_2017_668_MOESM2_ESM.docx (17 kb)
ESM 2(DOCX 17 kb)

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Copyright information

© INRA and Springer-Verlag France SAS 2017

Authors and Affiliations

  • Li-Na Xie
    • 1
    • 2
  • Hong-Yu Guo
    • 1
  • Zhe Liu
    • 1
  • Christopher A. Gabler
    • 3
  • Wei-Zhong Chen
    • 1
  • Song Gu
    • 2
  • Cheng-Cang Ma
    • 1
  1. 1.Tianjin Key Laboratory of Animal and Plant Resistance, College of Life SciencesTianjin Normal UniversityTianjinChina
  2. 2.College of Life SciencesNankai UniversityTianjinChina
  3. 3.School of Earth, Environmental, and Marine Sciences and Department of BiologyUniversity of Texas Rio Grande ValleyBrownsvilleUSA

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