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Nitrogen enrichment suppresses revegetated shrub growth under increased precipitation via herb-induced topsoil water limitation in a desert ecosystem in northern China

  • Weiwei She
  • Yuxuan Bai
  • Yuqing ZhangEmail author
  • Shugao Qin
  • Xin Jia
  • Wei Feng
  • Zongrui Lai
  • Jie Fu
  • Yangui Qiao
Regular Article
  • 181 Downloads

Abstract

Background and aims

Revegetated woody plant communities are widely distributed in degraded drylands, and they are expected to be intrinsically sensitive to precipitation change and nitrogen enrichment. However, the interactive effects of precipitation and nitrogen on them remain largely unknown. This study aimed to examine how revegetated plant community responds to an increase in precipitation and nitrogen enrichment.

Methods

We conducted a field experiment over three years in a revegetated Artemisia ordosica shrubland in the Mu Us Desert of northern China, and investigated the effects of water and nitrogen addition on plant growth and soil resource availability.

Results

Increased precipitation and nitrogen enrichment dramatically promoted herb growth. Increased precipitation significantly increased shrub productivity without fertilization, whereas nitrogen enrichment weakened shrub growth under increased precipitation. Nitrogen enrichment significantly reduced topsoil moisture and offset water stress alleviation under increased precipitation. Structural equation modeling revealed that nitrogen-enhanced herb growth caused topsoil moisture to decline, potentially weakening shrub growth under increased precipitation.

Conclusions

The results suggest that nitrogen enrichment tends to suppress shrub growth under increased precipitation due to herb-induced topsoil water limitation. Our findings provide empirical evidence that water competition from herbaceous plants negatively affect shrub growth under nitrogen enrichment, and highlight the plant-water interaction underlying the responses of desert shrubland to global environmental changes.

Keywords

Community composition Environmental changes Mu Us Desert Revegetation Shrubland 

Notes

Acknowledgements

This study was jointly supported by the Fundamental Research Funds for the Central Universities (BLX201815, 2015ZCQ-SB-02), the National Natural Science Foundation of China (31470711), and the National Key Research and Development Program of China (2016YFC0500905). We thank Shijun Liu, Zhen Liu, Jing Zheng, Liang Liu, and the staff of the Yanchi Research Station for providing assistance with field and laboratory work. The authors declare no conflict of interest.

Supplementary material

11104_2019_4362_MOESM1_ESM.docx (248 kb)
ESM 1 (DOCX 248 kb)

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Copyright information

© Springer Nature Switzerland AG 2019

Authors and Affiliations

  • Weiwei She
    • 1
    • 2
  • Yuxuan Bai
    • 1
  • Yuqing Zhang
    • 1
    • 3
    Email author
  • Shugao Qin
    • 1
    • 4
  • Xin Jia
    • 1
    • 3
  • Wei Feng
    • 1
    • 3
  • Zongrui Lai
    • 1
    • 3
  • Jie Fu
    • 1
  • Yangui Qiao
    • 1
  1. 1.Yanchi Research Station, School of Soil and Water ConservationBeijing Forestry UniversityBeijingPeople’s Republic of China
  2. 2.School of Forest ScienceBeijing Forestry UniversityBeijingPeople’s Republic of China
  3. 3.Key Laboratory of State Forestry Administration on Soil and Water ConservationBeijing Forestry UniversityBeijingPeople’s Republic of China
  4. 4.Engineering Research Center of Forestry Ecological Engineering, Ministry of EducationBeijing Forestry UniversityBeijingPeople’s Republic of China

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