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Aims <p>China has initiated nationwide management projects targeting the invasive plant&#xa0;<i>Spartina alterniflora</i> in coastal zones. while the impact of different <i>S. alterniflora</i> eradication strategies on carbon fluxes remains unclear.</p> Methods <p>This study investigated the effects of different strategies (application of Haloxyfop-R-methyl (HPEM) and repeated mowing (Mowing)) on the efficiency in eradicating&#xa0;<i>S. alterniflora</i>&#xa0;and the difference in carbon fluxes (CO<sub>2</sub>、CH<sub>4</sub>) through field experiments, futher analyzing the relationship between sediment physicochemical properties, and microbial communities and their relationship with carbon fluxes over a one-year period.</p> Results <p>Compared to Mowing, HPEM is more effective in eradicating <i>S. alterniflora</i>. Moreover,&#xa0;HPEM initially&#xa0;acted&#xa0;as a CO<sub>2</sub>&#xa0;source before the growing season, while repeated mowing sites consistently functioned as CO<sub>2</sub>&#xa0;sinks.&#xa0;Methane emissions at the HPEM site were significantly higher than those at Mowing and&#xa0;<i>S. alterniflora</i>&#xa0;sites during the non-growing season. Temperature and plant biomass were the main factors influencing carbon fluxes.&#xa0;Furthermore, we found that different eradication strategies significantly altered the soil microbial community structure, and these changes in microbial communities further influenced ecosystem respiration (ER), but had no significant impact on CH<sub>4</sub>&#xa0;emissions. Therefore, we assumed that the elevated CH₄ emissions at the HPEM site are primarily driven by the decomposition of dead plant material.</p> Conclusions <p>Overall, we recommend repeated mowing as an effective long-term management strategy for controlling&#xa0;<i>S. alterniflora</i>. In areas requiring rapid and thorough removal of&#xa0;<i>S. alterniflora</i>, Haloxyfop-R-methyl can be employed, but vegetation should be promptly cut down after treatment to minimize the negative environmental impact of methane emissions.</p>

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Evaluation of carbon flux responses to physical and chemical control strategies of Spartina alterniflora in the Yangtze River Delta

  • 期刊论文

  • 发表日期：

    2025年6月13日

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  • Lv Gong,
  • Yuanhao Song,
  • Wenzhen Zhao,
  • Lin Su,
  • Shupu Wu,
  • Yang Hu,
  • Ben Li,
  • Xiuzhen Li

摘要

Aims

China has initiated nationwide management projects targeting the invasive plant Spartina alterniflora in coastal zones. while the impact of different S. alterniflora eradication strategies on carbon fluxes remains unclear.

Methods

This study investigated the effects of different strategies (application of Haloxyfop-R-methyl (HPEM) and repeated mowing (Mowing)) on the efficiency in eradicating S. alterniflora and the difference in carbon fluxes (CO2、CH4) through field experiments, futher analyzing the relationship between sediment physicochemical properties, and microbial communities and their relationship with carbon fluxes over a one-year period.

Results

Compared to Mowing, HPEM is more effective in eradicating S. alterniflora. Moreover, HPEM initially acted as a CO2 source before the growing season, while repeated mowing sites consistently functioned as CO2 sinks. Methane emissions at the HPEM site were significantly higher than those at Mowing and S. alterniflora sites during the non-growing season. Temperature and plant biomass were the main factors influencing carbon fluxes. Furthermore, we found that different eradication strategies significantly altered the soil microbial community structure, and these changes in microbial communities further influenced ecosystem respiration (ER), but had no significant impact on CH4 emissions. Therefore, we assumed that the elevated CH₄ emissions at the HPEM site are primarily driven by the decomposition of dead plant material.

Conclusions

Overall, we recommend repeated mowing as an effective long-term management strategy for controlling S. alterniflora. In areas requiring rapid and thorough removal of S. alterniflora, Haloxyfop-R-methyl can be employed, but vegetation should be promptly cut down after treatment to minimize the negative environmental impact of methane emissions.