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<p>Invasive alien plants (IAPs) perturb native biodiversity, ecosystem services, and human well-being. Allelopathy in IAPs is mediated by releasing allelochemicals, inextricably linked with the ‘novel weapon hypothesis’ (NWH). Also, the ‘resource hypothesis’ (RH) elucidates the role of soil attributes in facilitating IAPs spread. Present study aims to validate NWH and RH to compare the effects of IAPs on the soil physicochemical and allelochemic (total phenolic content (TPC)) attributes at different disturbance gradients in Aizawl, Mizoram, North East India. This Indo-Burma global biodiversity hotspot is faced with multiple anthropogenic disturbances, driving infestation of IAPs from Asteraceae with aggressive plant traits. The dominant IAPs i.e., <i>Chromolaena odorata</i> (L.) R.M. King and H. Rob., <i>Ageratum conyzoides</i> L., and <i>Mikania micrantha</i> Kunth., were selected to assess their effects on soil attributes and allelochemicals. To this end, seasonal monitoring of soil physicochemical characteristics and TPC was performed at IAPs invaded sites using standard methodology. Results revealed modulations of soil chemistry along the disturbance gradient. Soil pH values decreased along the disturbance regime while variations in soil moisture and soil organic carbon (SOC) were IAP-specific. Among IAPs, <i>A. conyzoides</i> invaded sites demonstrated highest moisture content and SOC. Statistical validation through ANOVA corroborated the variable ‘IAPs-disturbance interactions’ (p &lt; 0.05). Similarly, TPC values were noted in decreasing trend <i>A. conyzoides</i> &gt; <i>M. micrantha</i> &gt; <i>C. odorata</i>, however, variations noted significant only in the case of <i>C. odorata</i> with catechol as a standard (p &lt; 0.05). The study concluded that the IAPs-disturbance interactions are inextricably linked with soil chemistry and play vital role in their sustainable control/management. Nevertheless, the TPC may act as an indirect proxy for allelopathy and require further allelochemic characterization with pot or microcosm bioassay experiments.</p>

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Effects of three invasive alien plant species on soil attributes at different disturbance gradients in Aizawl, Mizoram, North East India

  • 期刊论文

  • 发表日期：

    2025年6月23日

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  • Roger Bruce Syngkli,
  • Baby Lalremruati,
  • Prabhat Kumar Rai

摘要

Invasive alien plants (IAPs) perturb native biodiversity, ecosystem services, and human well-being. Allelopathy in IAPs is mediated by releasing allelochemicals, inextricably linked with the ‘novel weapon hypothesis’ (NWH). Also, the ‘resource hypothesis’ (RH) elucidates the role of soil attributes in facilitating IAPs spread. Present study aims to validate NWH and RH to compare the effects of IAPs on the soil physicochemical and allelochemic (total phenolic content (TPC)) attributes at different disturbance gradients in Aizawl, Mizoram, North East India. This Indo-Burma global biodiversity hotspot is faced with multiple anthropogenic disturbances, driving infestation of IAPs from Asteraceae with aggressive plant traits. The dominant IAPs i.e., Chromolaena odorata (L.) R.M. King and H. Rob., Ageratum conyzoides L., and Mikania micrantha Kunth., were selected to assess their effects on soil attributes and allelochemicals. To this end, seasonal monitoring of soil physicochemical characteristics and TPC was performed at IAPs invaded sites using standard methodology. Results revealed modulations of soil chemistry along the disturbance gradient. Soil pH values decreased along the disturbance regime while variations in soil moisture and soil organic carbon (SOC) were IAP-specific. Among IAPs, A. conyzoides invaded sites demonstrated highest moisture content and SOC. Statistical validation through ANOVA corroborated the variable ‘IAPs-disturbance interactions’ (p < 0.05). Similarly, TPC values were noted in decreasing trend A. conyzoides > M. micrantha > C. odorata, however, variations noted significant only in the case of C. odorata with catechol as a standard (p < 0.05). The study concluded that the IAPs-disturbance interactions are inextricably linked with soil chemistry and play vital role in their sustainable control/management. Nevertheless, the TPC may act as an indirect proxy for allelopathy and require further allelochemic characterization with pot or microcosm bioassay experiments.