The major factors controlling the soil methane (CH4) concentration and CH4 emissions of various plant (mainly wetland) species were identified. Five plant species (Oryza sativa, Zizania latifolia, Phragmites australis, Sesbania cannabina, and Bidens tripartita) were separately cultivated under the flooded soil conditions. The direct CH4 scavenging potential of B. tripartita roots was also measured in conjunction with in vitro CH4 scavenging experiments using H2O2 and several transition metal ions. CH4 emissions from the soil-cultivated plants did not depend on the maximum CH4 emission potential for each plant species but on the soil CH4 concentrations, which were positively correlated with the CH4 production potential of the soil and negatively correlated with soil Eh values. Bidens tripartita roots possessed the highest increasing soil Eh potential and a direct, immediate, and continuous CH4 scavenging potential via the Fenton reaction using a considerably high concentration of root apoplastic H2O2 and rhizosphere Fe2+. Bidens tripartita presented the highest soil Eh ascending potential. The in vitro experiments suggested the involvement of・OH/FeIVO2+ via the newly termed rhizosphere Fenton reaction as a strong destructive power for CH4. To our knowledge, this is the first report on direct CH4 scavenging by high H2O2-exuding plant roots.

中文翻译：

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毛刺万寿菊（Bidens tripartita L.）通过根际芬顿反应直接和立即用大量渗出的过氧化氢清除根际甲烷

确定了控制各种植物（主要是湿地）物种的土壤甲烷 (CH4) 浓度和 CH4 排放的主要因素。在淹水土壤条件下分别种植了五种植物物种（水稻、茼蒿、芦苇、田菁和三部分）。还结合使用 H2O2 和几种过渡金属离子的体外 CH4 清除实验测量了 B.tripartita 根的直接 CH4 清除潜力。土壤栽培植物的 CH4 排放不取决于每个植物物种的最大 CH4 排放潜力，而是取决于土壤 CH4 浓度，这与土壤的 CH4 生产潜力呈正相关，与土壤 Eh 值呈负相关。Bidens tripartita 根通过使用相当高浓度的根质外体 H2O2 和根际 Fe2+ 的芬顿反应，具有最高的土壤 Eh 增加潜力和直接、即时和连续的 CH4 清除潜力。Bidens tripartita 呈现出最高的土壤 Eh 上升潜力。体外实验表明，OH/FeIVO2+ 通过新命名的根际芬顿反应参与，对 CH4 具有很强的破坏力。据我们所知，这是关于高 H2O2 排放植物根系直接清除 CH4 的第一份报告。体外实验表明，OH/FeIVO2+ 通过新命名的根际芬顿反应参与，对 CH4 具有很强的破坏力。据我们所知，这是关于高 H2O2 排放植物根系直接清除 CH4 的第一份报告。体外实验表明，OH/FeIVO2+ 通过新命名的根际芬顿反应参与，对 CH4 具有很强的破坏力。据我们所知，这是关于高 H2O2 排放植物根系直接清除 CH4 的第一份报告。