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Effects of Rust on Plant Growth and Stoichiometry of Leymus chinensis under Different Grazing Intensities in Hulunber Grassland

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  • Yawen Zhang

    (State Key Laboratory of Grassland Agro-Ecosystems, Key Laboratory of Grassland Livestock Industry Innovation, Ministry of Agriculture and Rural Affairs, College of Pastoral Agricultural Science and Technology, Lanzhou University, Lanzhou 730020, China
    School of Pharmacy, Lanzhou University, Lanzhou 730000, China)

  • Zhibiao Nan

    (State Key Laboratory of Grassland Agro-Ecosystems, Key Laboratory of Grassland Livestock Industry Innovation, Ministry of Agriculture and Rural Affairs, College of Pastoral Agricultural Science and Technology, Lanzhou University, Lanzhou 730020, China)

  • Michael John Christensen

    (Retired from AgResearch, Grasslands Research Centre, Private Bag 11-008, Palmerston North 4442, New Zealand)

  • Xiaoping Xin

    (National Hulunber Grassland Ecosystem Observation and Research Station, Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Science, Beijing 100081, China)

  • Nan Zhang

    (School of Pharmacy, Lanzhou University, Lanzhou 730000, China)

Abstract

Grazing is the main utilization of native grassland, and forage fungal disease is one of the limiting factors of grassland productivity. The present research in the Hulunber meadow steppe grassland was conducted to investigate the responses of the dominant plant Leymus chinensis (Trin.) to beef cattle grazing, rust, and their interaction influence. Six grazing intensity treatments with three replicates were established. The response of L . chinensis to grazing and rust was systematically studied for two consecutive years. The main findings were that grazing and rust had significant effects ( p < 0.05) on the growth and nutrient elements content of L . chinensis . Compared with the 0 cattle ha −1 treatment, the dry matter of L . chinensis in the 0.42, 0.63, and 1.67 cattle ha −1 treatments decreased by 42.2%, 90.5%, and 339.5%, respectively. Compared with non-infected plants, dry matter of rust-infected L . chinensis plants decreased by 45.6%. The N:C and P:C ratios of rust-infected plants were lower than in non-infected plants, and positively correlated with their relative growth rates. Therefore, we concluded that the growth rate hypothesis still applied in L . chinensis under the interactive effects of grazing and disease. Additionally, grazing can alleviate the loss of dry matter caused by disease.

Suggested Citation

  • Yawen Zhang & Zhibiao Nan & Michael John Christensen & Xiaoping Xin & Nan Zhang, 2022. "Effects of Rust on Plant Growth and Stoichiometry of Leymus chinensis under Different Grazing Intensities in Hulunber Grassland," Agriculture, MDPI, vol. 12(7), pages 1-15, July.
  • Handle: RePEc:gam:jagris:v:12:y:2022:i:7:p:961-:d:855794
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    References listed on IDEAS

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