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Grazing exclusion-induced shifts, the relative importance of environmental filtering, biotic interactions and dispersal limitation in shaping desert steppe communities, northern China

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Abstract

Grazing exclusion is one of the most efficient approaches to restore degraded grassland but may negatively affects the recovery of species diversity. Changes in plant species diversity should be a consequence of the ecological assembly process. Local community assembly is influenced by environmental filtering, biotic interactions, and dispersal. However, how these factors potentially contribute to changes to species diversity is poorly understood, especially in harsh environments. In this study, two management sites within a Stipa breviflora desert steppe community (typical natural steppe) were selected in northern China. In one of the two management sites, grazing has been excluded since 2010 and in the other with open grazing by sheep. In August 2016, three plots were established and 100 sampling units were created within each plot in a 5 m×5 m area at the two management sites. To assess the effects of grazing exclusion on S. breviflora steppe, we analyzed the vegetation biomass, species diversity, soil organic carbon, and soil particle size distribution using paired T-tests. In addition, variation partitioning was applied to determine the relative importance of environmental filtering and dispersal limitation. Null mode analysis was used to quantify the influence of biotic interactions in conjunction with EcoSim niche overlap and co-occurrence values. Our results demonstrated that (1) species diversity significantly decreased and the main improvements in soil quality occurred in the topsoil 0–10 cm after the grazing exclusion; (2) environmental filtering was important for community assembly between grazed and fenced grassland and this appears particularly true for soil particle size distribution, which may be well correlated with soil hydrological processes; and (3) however, competitive exclusion may play a significant role within the exclusion. The multiple pathways of assembly may collectively determine negative effects on the restoration of species diversity. Therefore, designers should be aware of the risk of reducing grazing exclusion-induced species diversity and account for manipulating processes. This in turn will reduce dominant species and promote environmental heterogeneity to maximize species diversity in semi-arid regions.

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Acknowledgements

The study was financially supported by the National Natural Science Foundation of China (41461046, 31760707). We thank GUO Junlong, ZHANG Yuping, XUE Yi, CHEN Juan, SUI Jinming, and ZHAO Wei for their help with the sampling and measuring of soil organic carbon. We would also like to thank Alison BEAMISH from the University of British Columbia for her assistance with language and grammar checking.

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Authors and Affiliations

  1. Breeding Base for State Key Laboratory of Land Degradation and Ecological Restoration in Northwest China, Ningxia University, Yinchuan, 750021, China

    Xing Wang, Naiping Song, Xinguo Yang, Lei Wang & Lin Chen

  2. School of Agriculture, Ningxia University, Yinchuan, 750021, China

    Xing Wang & Naiping Song

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  1. Xing Wang
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  2. Naiping Song
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Correspondence to Naiping Song.

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Wang, X., Song, N., Yang, X. et al. Grazing exclusion-induced shifts, the relative importance of environmental filtering, biotic interactions and dispersal limitation in shaping desert steppe communities, northern China. J. Arid Land 10, 402–415 (2018). https://doi.org/10.1007/s40333-018-0411-5

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  • DOI: https://doi.org/10.1007/s40333-018-0411-5

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