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<p>The invasive plants <i>Bidens alba</i> and <i>Mikania micrantha</i> widely invade areas in southern China and pose severe threats to forest ecosystems. These invasive species are difficult to control by conventional methods, but ecological control techniques offer promising solutions. The <i>diversity resistance hypothesis</i> suggests that diverse communities are more resistant to plant invasion. Although the <i>homeland security hypothesis</i> posits that native species can resist invasive plants by releasing allelochemicals, the role of allelochemicals from native plants in influencing the <i>diversity resistance</i> remains unclear. Thus, the litters of several common native tree species from Guangdong Province were utilized to prepare extracts with different diversity levels (1, 4, and 8), and the effects of these extracts on the seed germination and seedling growth of <i>B. alba</i> and <i>M. micrantha</i> were investigated. The results revealed that the extracts of all species at the high concentrations inhibited germination, except <i>Delonix regia</i>, but higher-diversity mixtures did not increase the inhibitory effect. We found that four of the identified allelochemicals in the extracts were strongly associated with these inhibitory effects. These findings highlight that certain native species may play a key role in ecological control against biological invasions and that the effectiveness of allelopathic control depends more on chemical identity than on chemical diversity.</p>

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Allelopathic effects of native plant litter extracts on seedling establishment of the invasive plants Bidens Alba and Mikania Micrantha

  • 期刊论文

  • 发表日期：

    2026年2月18日

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  • Yu-Qi Fang,
  • Zhe-Yang Su,
  • Chong-Wei Li,
  • Bao-Ming Chen

摘要

The invasive plants Bidens alba and Mikania micrantha widely invade areas in southern China and pose severe threats to forest ecosystems. These invasive species are difficult to control by conventional methods, but ecological control techniques offer promising solutions. The diversity resistance hypothesis suggests that diverse communities are more resistant to plant invasion. Although the homeland security hypothesis posits that native species can resist invasive plants by releasing allelochemicals, the role of allelochemicals from native plants in influencing the diversity resistance remains unclear. Thus, the litters of several common native tree species from Guangdong Province were utilized to prepare extracts with different diversity levels (1, 4, and 8), and the effects of these extracts on the seed germination and seedling growth of B. alba and M. micrantha were investigated. The results revealed that the extracts of all species at the high concentrations inhibited germination, except Delonix regia, but higher-diversity mixtures did not increase the inhibitory effect. We found that four of the identified allelochemicals in the extracts were strongly associated with these inhibitory effects. These findings highlight that certain native species may play a key role in ecological control against biological invasions and that the effectiveness of allelopathic control depends more on chemical identity than on chemical diversity.