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Plant and Soil

, Volume 442, Issue 1–2, pp 311–321 | Cite as

Shrub patches capture tumble plants: potential evidence for a self-reinforcing pattern in a semiarid shrub encroached grassland

  • Yuchun YanEmail author
  • Dawei Xu
  • Xingliang Xu
  • Deli Wang
  • Xu Wang
  • Yurong Cai
  • Jinqiang Chen
  • Xiaoping XinEmail author
  • David J Eldridge
Regular Article

Abstract

Background and aims

The development of fertile patches within an infertile matrix is a common phenomenon in drylands. Shrub-centered expansion of fertile islands is generally attributed to processes of sediment erosion and deposition, but there have been fewer studies of how litter might contribute to the development of fertile islands in semiarid shrub grassland.

Methods

We quantified the capture of two tumble plant species (Cleistogenes squarrosa, Salsola collina; also known as tumble weeds) by shrubs across ten sites across 38,000 km2 of a semiarid grassland encroached by Caragana microphylla.

Results

Tumble plants are plants that blow across the grassland propelled by strong winds. Both tumble plant species were found over extensive areas of semiarid grassland, and their distribution coincides with the distribution of Caragana microphylla. Biomass production of both tumble plants averaged 12.2 g m−2 (range: 1.0 to 25.0 g m−2) and litter accumulation (amount accruing from wind-blown plants) of both tumble plants was significantly greater beneath shrubs (94.5 ± 28.9 g m−2 mean ± SE) than in the interspaces (3.3 ± 1.4 g m−2). Most of the material collecting under Caragana microphylla comprised tumble plants. Increases in the area of Caragana microphylla patches did not correspond to greater tumble plant capture. However, the supply of tumble plants was the strongest predictor of capture within shrub hummocks, suggesting that tumble plant capture is source limited rather than sink limited. Our structural equation model indicates that increases in grass cover and height were indirectly and negatively associated with tumble plant capture by reducing the tumble plant supply. Contrary to prediction, shrub height and shrub patch area had no overall effect on the tumble plant capture.

Conclusions

Overall, we maintain that the capture of tumble plants by shrubs is an important self-maintaining mechanism of shrub-encroached grasslands. Tumble plant abundance is predicted to increase with increasing surface human disturbance and aridity. Therefore, the “shrub-litter island” effect is likely to be an important mechanism for maintaining and promoting the encroachment of shrubs into semiarid grasslands.

Keywords

Fertile island Shrub Temperate grassland Tumble plants Encroachment 

Notes

Acknowledgements

This study was partially funded by the National Natural Science Foundation of China (41671044), the National Key Research and Development Program of China (2016YFC0500603, 2017YFE0104500), Fundamental Research Funds for Central Nonprofit Scientific Institution (931-8), and Special Funding for the Modern Agricultural Technology System of the Chinese Ministry of Agriculture.

Supplementary material

11104_2019_4189_MOESM1_ESM.pdf (112 kb)
ESM 1 (PDF 112 kb)

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Copyright information

© Springer Nature Switzerland AG 2019

Authors and Affiliations

  • Yuchun Yan
    • 1
    Email author
  • Dawei Xu
    • 1
  • Xingliang Xu
    • 2
  • Deli Wang
    • 3
  • Xu Wang
    • 1
  • Yurong Cai
    • 1
  • Jinqiang Chen
    • 1
  • Xiaoping Xin
    • 1
    Email author
  • David J Eldridge
    • 4
  1. 1.Institute of Agricultural Resources and Regional PlanningChinese Academy of Agricultural SciencesBeijingChina
  2. 2.Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources ResearchChinese Academy SciencesBeijingChina
  3. 3.Key Laboratory of Vegetation Ecology, Ministry of Education, Institute of Grassland ScienceNortheast Normal UniversityChangchunChina
  4. 4.Centre for Ecosystem Science, School of Biological, Earth and Environmental SciencesUniversity of New South WalesSydneyAustralia

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