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Decomposition time, chemical traits and climatic factors determine litter-mixing effects on decomposition in an alpine steppe ecosystem in Northern Tibet

  • Youchao Chen
  • Shuqin Ma
  • Hongmao Jiang
  • Degyi Yangzom
  • Genwei Cheng
  • Xuyang LuEmail author
Regular Article
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Abstract

Aim

In the context of rapid species diversity loss, whether and how species diversity affects litter decomposition in alpine ecosystems remain unclear. Here, we aimed to assess the impact of litter mixing on decomposition and the influencing factors of such litter-mixing effects (LMEs).

Methods

We incubated the litter of four alpine steppe species in monocultures and all possible litter combinations and analysed the mass remaining over three years.

Results

Litter mixing showed more frequent antagonistic effects than synergistic effects in the early stage of the experiment; however, the LME might change from antagonistic to synergistic at the latter stage of incubation. The magnitude of the LMEs increased as decomposition progressed. The four-species mixture resulted in more antagonistic effects, while the magnitude of the non-additive effects showed no relationship with species richness. Litter chemical traits and climatic factors affected the direction and magnitude of the non-additive effects, but these influences were time-dependent. Additionally, the fast-decomposing and slow-decomposing litter species had negative and positive responses to the litter mixture, respectively.

Conclusion

Our results demonstrate that the LME was determined by decomposition time, chemical traits and climatic factors and suggest that assessing the relative individual performances of the litter components in a mixture is an important way to examine the mechanisms underlying LMEs.

Keywords

Biodiversity Litter decomposition Litter mixture Northern Tibet Non-additive effects 

Notes

Acknowledgements

This study was supported by the Natural Science Foundation of China (Grant No. 41671262 &41877338), Key Laboratory of Mountain Surface Processes and Ecological Regulation, Chinese Academy of Sciences, and the Natural Science Foundation of Tibet Autonomous Region.

Supplementary material

11104_2019_4131_MOESM1_ESM.docx (12.6 mb)
ESM 1 (DOCX 12863 kb)

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Copyright information

© Springer Nature Switzerland AG 2019

Authors and Affiliations

  • Youchao Chen
    • 1
    • 2
  • Shuqin Ma
    • 3
  • Hongmao Jiang
    • 2
    • 4
  • Degyi Yangzom
    • 5
  • Genwei Cheng
    • 2
  • Xuyang Lu
    • 2
    Email author
  1. 1.Key Laboratory of Aquatic Botany and Watershed Ecology, Wuhan Botanical GardenChinese Academy of SciencesWuhanChina
  2. 2.Institute of Mountain Hazards and EnvironmentChinese Academy of SciencesChengduChina
  3. 3.College of TourismHenan Normal UniversityXinxiangChina
  4. 4.University of Chinese Academy of SciencesBeijingChina
  5. 5.Ecological Monitoring & Research CenterTibetan Environment Monitoring StationLhasaChina

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