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<p>Manganese (Mn) is regarded as a crucial factor regulating wood litter decay and property change. However, the effect of Mn on wood litter-leached dissolved organic carbon (DOC) characteristics during decomposition remains unexplored in forests. We collected four wood organs (culm base, rhizome, culm root, and culm) from <i>Phyllostachys edulis</i> (moso bamboo) in a subtropical moso bamboo forest in southern China, and combined Mn addition in the field and laboratory leaching experiment to determine the influence of Mn on the quantity and bioavailability of DOC leached from decomposing bamboo wood organs. For each organ type, Mn addition generally increased DOC amount, DOC aromaticity, DOC molecular weight and DOC: dissolve total phosphorus (DTP) ratio, but decreased DOC bioavailability in the bamboo wood organ leachates over 360-day exposure in the field. Moreover, bamboo wood organ-leached DOC bioavailability negatively correlated with corresponding DOC aromaticity, DOC molecular weight, and DOC: DTP ratio, but exhibited no relationship with corresponding DOC: dissolved total nitrogen (DTN) ratio in the leachates. These observations highlight the pivotal role of Mn in regulating bamboo wood organ-leached DOC amount, and suggest that Mn addition influences bamboo wood organ-leached DOC bioavailability via its effect on DOC quality and phosphorus availability in the leachates in subtropical moso bamboo forests.</p>

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Amount and bioavailability of dissolved organic carbon leached from decomposing bamboo wood organs under manganese addition in a subtropical moso bamboo forest

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  • 发表日期：

    2026年6月19日

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  • Jiawen Xu,
  • Jun Deng,
  • Ziying Zhang,
  • Gong Zhang,
  • Ting Li,
  • Hanchang Zhou,
  • Lin Yu

摘要

Manganese (Mn) is regarded as a crucial factor regulating wood litter decay and property change. However, the effect of Mn on wood litter-leached dissolved organic carbon (DOC) characteristics during decomposition remains unexplored in forests. We collected four wood organs (culm base, rhizome, culm root, and culm) from Phyllostachys edulis (moso bamboo) in a subtropical moso bamboo forest in southern China, and combined Mn addition in the field and laboratory leaching experiment to determine the influence of Mn on the quantity and bioavailability of DOC leached from decomposing bamboo wood organs. For each organ type, Mn addition generally increased DOC amount, DOC aromaticity, DOC molecular weight and DOC: dissolve total phosphorus (DTP) ratio, but decreased DOC bioavailability in the bamboo wood organ leachates over 360-day exposure in the field. Moreover, bamboo wood organ-leached DOC bioavailability negatively correlated with corresponding DOC aromaticity, DOC molecular weight, and DOC: DTP ratio, but exhibited no relationship with corresponding DOC: dissolved total nitrogen (DTN) ratio in the leachates. These observations highlight the pivotal role of Mn in regulating bamboo wood organ-leached DOC amount, and suggest that Mn addition influences bamboo wood organ-leached DOC bioavailability via its effect on DOC quality and phosphorus availability in the leachates in subtropical moso bamboo forests.