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Long-term grazing effects on soil-borne pathogens are driven by temperature.

Yue Wang1, Minna Zhang2, Manuel Delgado-Baquerizo3

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Long-term livestock grazing impacts soil-borne fungal pathogens, with effects influenced by temperature. Grazing increased pathogen richness in cooler grasslands, affecting plant communities.

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Area of Science:

  • Ecology
  • Soil Science
  • Plant Pathology

Background:

  • Soils host diverse plant pathogens sensitive to global change.
  • Climate and livestock grazing are key drivers of grassland ecosystem change.
  • The interactive effects of grazing and climate on soil-borne pathogens are poorly understood.

Purpose of the Study:

  • To investigate the long-term impacts of livestock grazing on soil-borne fungal plant pathogens.
  • To examine the association between plant communities and soil-borne pathogens under grazing.
  • To understand how climate gradients modulate grazing effects on pathogens in steppe ecosystems.

Main Methods:

  • Conducted a regional-scale, long-term experiment across 10 sites in Northern China.
  • Studied soil-borne fungal plant pathogens and plant communities along a climate gradient.
  • Analyzed the influence of livestock grazing and temperature on pathogen distribution and diversity.

Main Results:

  • Long-term grazing increased the richness and proportion of soil-borne fungal pathogens, particularly in cooler grasslands.
  • Temperature was a key factor controlling grazing effects on pathogen communities.
  • Grazing enhanced the associations between soil-borne fungal pathogens and plant communities.

Conclusions:

  • Climate, specifically temperature, critically mediates the impact of livestock grazing on soil-borne fungal plant pathogens.
  • Understanding these interactions is vital for managing grassland ecosystems under global change.
  • Grazing management strategies should consider local climatic conditions to mitigate pathogen risks.