Recovery of soil microbial diversity and functions along a tropical montane forest disturbance gradient
Recovery of soil microbial diversity and functions along a tropical montane forest disturbance gradient
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DOI：
10.3389/fenvs.2022.853686
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发表时间：
2022-09
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影响因子：
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通讯作者：
Renee Sniegocki;Jessica B. Moon;Abigail Rutrough;Jude Gireneus;J. Seelan;M. Farmer;D. Weindorf;K. Naithani
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文献类型：
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作者：
Renee Sniegocki;Jessica B. Moon;Abigail Rutrough;Jude Gireneus;J. Seelan;M. Farmer;D. Weindorf;K. Naithani
热带森林中的伐木和森林转化正以惊人的速度发生。这些干扰改变了土壤微生物群落的结构和功能。虽然 pH 值等土壤特性变化与微生物群落结构之间的直接联系已得到充分证实，但人们对伐木和森林转变对土壤微生物群落结构和功能的间接影响知之甚少。我们采用时空替代的方法来研究婆罗洲北部热带山地森林中土壤微生物多样性和森林恢复梯度功能的变化。我们使用表面（顶部 5 厘米）土壤来评估土壤理化和微生物（下一代 DNA 测序）特性，并使用标准化垃圾袋（茶袋指数）来评估垃圾分解和稳定性。我们的结果表明，细菌和真菌多样性随着恢复时间的推移而增加，并在扰动后 60 至 80 年间达到扰动前的水平。凋落物分解速率常数随着细菌和真菌多样性的增加而线性增加。凋落物稳定性也随真菌多样性线性增加，但在细菌多样性中等水平时最高。我们的研究结果提供了关于森林采伐和转化对土壤影响的见解，并强调了热带山地森林土壤微生物多样性与土壤功能之间的紧密耦合。
Logging and forest conversion are occurring at alarming rates in tropical forests. These disturbances alter soil microbial community structure and functions. While direct links between changes in soil properties, such as pH and microbial community structure are well established, the indirect effects of logging and forest conversion on soil microbial community structure and functions are poorly understood. We used a space-for-time substitution to investigate the changes in soil microbial diversity and functions across a forest recovery gradient in the tropical montane forests of northern Borneo. We used surface (top 5 cm) soil to assess soil physicochemical and microbial (next-generation DNA sequencing) properties, and standardized litterbags (Tea Bag Index) to assess litter decomposition and stabilization. Our results show that bacterial and fungal diversity increases with recovery time and reaches pre-disturbance levels between 60- and 80-years post-disturbance. Litter decomposition rate constants increased linearly with increasing bacterial and fungal diversity. Litter stabilization also increased linearly with fungal diversity, but was highest at intermediate levels of bacterial diversity. Our results provide insights on the effects of forest logging and conversion on soils and highlight the tight coupling between soil microbial diversity and soil functions in tropical montane forests.