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Acta Prataculturae Sinica ›› 2024, Vol. 33 ›› Issue (9): 28-39.DOI: 10.11686/cyxb2023388

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A study of the relationship between plant functional traits and environmental factors in the alpine meadows of western Sichuan

Yang-yi-dan HE1(), Chang-ming CHEN1, Xiao-xia HUANG2, Guo-mei SHI1, Ke-jian HE1()   

  1. 1.School of Earth Sciences,International Joint Research Center for Karstology,Yunnan Institute of Geography,Yunnan University,Kunming 650091,China
    2.School of Water Conservancy,Yunnan Agricultural University,Kunming 650201,China
  • Received:2023-10-18 Revised:2023-12-04 Online:2024-09-20 Published:2024-06-20
  • Contact: Ke-jian HE

Abstract:

As a bridge connecting plants and the environment, plant functional traits reflect the adaptation of plants to the environment and the interrelationships between different functions within plants. This study, based on plant community, plant functional traits, and habitat survey results, analyzed the relationship between plant functional traits and environmental factors in the alpine meadows of western Sichuan. The results showed that the functional traits of alpine meadow plants were mainly coordinated, especially in terms of energy, substrate, and biomass allocation. There was a clear trade-off between root-shoot ratio (RSR), and stem mass fraction (SMF), as well as reproductive organ mass fraction (RPMF). In response to stress and disturbance, alpine meadow plants devoted more resources to root growth and development, and less to stems and reproductive organs, while ensuring resources for photosynthesis in leaves. Alpine meadow plants employed a series of strategies to adapt to environmental stresses such as low temperature, intense radiation, and water scarcity, including dwarfing, reducing SMF, leaf mass fraction (LMF) and RPMF, lowering specific root length (SRL), increasing leaf dry matter content and specific leaf area, increasing RSR, increasing individual underground biomass and root dry matter content, etc. Anthropogenic disturbance led to a decrease in vegetation height, SMF, stem dry matter content, RPMF, reproductive organ dry matter content (RPDMC), LMF, SRL, and individual aboveground biomass of alpine meadow plants, and an increase in RSR. However, the changes in the functional traits of alpine meadow plants were primarily influenced by environmental factors, with the impact of anthropogenic disturbance relatively small. The research results provide a scientific foundation for understanding how plants adapt to environmental changes by adjusting functional traits, and for formulating effective strategies for the protection and management of meadows.

Key words: alpine meadow, plant functional traits, anthropogenic disturbance, trait trade-off, environmental adaptation