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Embedded rock fragments affect alpine steppe plant growth, soil carbon and nitrogen in the northern Tibetan Plateau

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Abstract

Background and Aims

Rock fragments within topsoil have important effects on soil properties and plant growth. This study mainly aimed to investigate the relationships between rock fragments, soil carbon (C) and nitrogen (N) densities and vegetation biomass in an alpine steppe.

Methods

Rock fragments, plant and soil samples were collected from four topographic positions (top, upper, lower, and bottom) on a hillslope.

Results

Volumetric rock fragment content within the 0–30 cm soil profile varied from 17.8 to 30.5%, the upper position value was significantly greater (P < 0.05) than those at other positions. The highest aboveground biomass was observed at the lower position (921 kg ha−1), while the highest belowground biomass within the 0–30 cm profile was found at the upper position (4460 kg ha−1). More fine earth and plant litter input accompanied by lower C and N losses induced by rainfall erosion resulted in higher soil organic C and total N densities (28.6 Mg C ha−1 and 2.87 Mg N ha−1) at the lower position.

Conclusions

Rock fragments may promote root growth but limit aboveground biomass production, and can therefore change the biomass distribution pattern. Our findings provide more evidence for scientifically assessing alpine steppe productivity.

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Acknowledgements

This study was funded by the “Strategic Priority Research Program” of the Chinese Academy of Sciences (XDB03030505), the National Natural Science Foundation of China (41573070) and the Open Fund of the State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences (Y412201403).

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Authors and Affiliations

  1. Key Laboratory of Mountain Surface Processes and Ecological Regulation, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, #.9, Block 4, Renminnanlu Road, Chengdu, 610041, China

    Ziyin Du, Yanjiang Cai, Yan Yan & Xiaodan Wang

  2. University of Chinese Academy of Sciences, Beijing, 100049, China

    Ziyin Du

  3. State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, 210008, China

    Yanjiang Cai

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  1. Ziyin Du
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  2. Yanjiang Cai
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  3. Yan Yan
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  4. Xiaodan Wang
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Correspondence to Yanjiang Cai or Xiaodan Wang.

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Du, Z., Cai, Y., Yan, Y. et al. Embedded rock fragments affect alpine steppe plant growth, soil carbon and nitrogen in the northern Tibetan Plateau. Plant Soil 420, 79–92 (2017). https://doi.org/10.1007/s11104-017-3376-9

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