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Oecologia

, Volume 184, Issue 1, pp 13–24 | Cite as

Effects of resource addition on recovery of production and plant functional composition in degraded semiarid grasslands

  • Qing Chen
  • David U. Hooper
  • Hui Li
  • Xiao Ying Gong
  • Fei Peng
  • Hong Wang
  • Klaus Dittert
  • Shan Lin
Highlighted Student Research

Abstract

Degradation of semiarid ecosystems from overgrazing threatens a variety of ecosystem services. Rainfall and nitrogen commonly co-limit production in semiarid grassland ecosystems; however, few studies have reported how interactive effects of precipitation and nitrogen addition influence the recovery of grasslands degraded by overgrazing. We conducted a 6-year experiment manipulating precipitation (natural precipitation and simulated wet year precipitation) and nitrogen (0, 25 and 50 kg N ha−1) addition at two sites with different histories of livestock grazing (moderately and heavily grazed) in Inner Mongolian steppe. Our results suggest that recovery of plant community composition and recovery of production can be decoupled. Perennial grasses provide long-term stability of high-quality forage production in this system. Supplemental water combined with exclosures led, in the heavily grazed site, to the strongest recovery of perennial grasses, although widespread irrigation of rangeland is not a feasible management strategy in many semiarid and arid regions. N fertilization combined with exclosures, but without water addition, increased dominance of unpalatable annual species, which in turn retarded growth of perennial species and increased inter-annual variation in primary production at both sites. Alleviation of grazing pressure alone allowed recovery of desired perennial species via successional processes in the heavily grazed site. Our experiments suggest that recovery of primary production and desirable community composition are not necessarily correlated. The use of N fertilization for the management of overgrazed grassland needs careful and systematic evaluation, as it has potential to impede, rather than aid, recovery.

Keywords

Nitrogen Overgrazing Water availability Plant functional group Recovery 

Notes

Acknowledgements

This work was supported by the National Natural Science Foundation of China (NSFC, 31300386/41071207), the Deutsche Forschungs Gemeinschaft (DFG, project DI 546/3-2), and the Innovation Team Training plan of the Tianjin Education Committee (TD12-5037). We thank the Botany Institute for providing working facilities, Drs. Yingzhi Gao and Marc Giese for their help with field work, Dr. Holger Brueck for his constructive suggestions on experimental design, and Drs. Peter Adler, Yongfei Bai, Kimberly La Pierre, David Schimel, Chris B. Zou and two anonymous reviewers for useful comments on previous drafts of this manuscript.

Author contribution statement

SL, QC and KD designed study; QC, HL, XYG, FP and HW performed the research; QC, SL and DUH analyzed data; QC, DUH, and SL wrote the paper.

Supplementary material

442_2017_3834_MOESM1_ESM.doc (252 kb)
Supplementary material 1 (DOC 252 kb)

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Copyright information

© Springer-Verlag Berlin Heidelberg 2017

Authors and Affiliations

  • Qing Chen
    • 1
    • 2
  • David U. Hooper
    • 3
  • Hui Li
    • 1
  • Xiao Ying Gong
    • 1
  • Fei Peng
    • 1
  • Hong Wang
    • 1
  • Klaus Dittert
    • 4
  • Shan Lin
    • 1
  1. 1.College of Resource and Environmental SciencesChina Agricultural UniversityBeijingPeople’s Republic of China
  2. 2.Tianjin Key Laboratory of Water Resources and EnvironmentTianjin Normal UniversityTianjinPeople’s Republic of China
  3. 3.Department of BiologyWestern Washington UniversityBellinghamUSA
  4. 4.Institute of Plant Nutrition and Crop PhysiologyUniversity of GoettingenGoettingenGermany

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