分解会导致溶解有机物的功能分子多样性短期增加
Rachelle E Davenport1, Marie E Kroeger2, Nikoli Tolić3
1Soil and Crop Science, School of Integrative Plant Science, Cornell University, Ithaca, NY, USA.
Nature communications
|December 10, 2025
概括
微生物代谢最初在植物垃圾分解过程中增加了土壤溶解有机物 (DOM) 的分子多样性. 后期阶段更倾向于少量回收化合物,分子量影响碳矿化.
科学领域:
- 土壤科学 土壤科学
- 微生物生态学 微生物生态学
- 生物地质化学生物地质化学
背景情况:
- 溶解有机物 (DOM) 的分子多样性受植物垃圾分解和微生物活动的影响.
- 在塑造DOM多样性和碳循环方面,微生物催化和合成的具体作用尚未完全理解.
研究的目的:
- 为了研究微生物过程如何影响DOM分子多样性在植物垃圾分解.
- 确定这些转化对有机碳矿物化的影响.
主要方法:
- 利用一个18O-H2O同位素标记技术来追踪DOM转换.
- 在蓝色草草 (Bouteloua gracilis) 的分解过程中跟踪微生物代谢.
主要成果:
- 18O标记的化合物显示,微生物生产在早期分解阶段 (天) 增加了DOM的功能多样性.
- 在较晚的分解阶段 (几个月) 没有观察到这种多样性增加.
- 来自DOM的碳矿化与分子量有很强的相关性,这表明化学性质的重要性.
结论:
- 早期微生物的催化和合成代谢增强了DOM分子多样性.
- 后来的分解阶段会导致少量回收的微生物化合物的积累.
- 分子重量是调节DOM微生物分解的关键因素.
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