在溪流中叶子分解的温度依赖性在生物群和叶子物种之间有所不同
Carolyn S Cummins1, Amy D Rosemond1, Nathan J Tomczyk1
1Odum School of Ecology, University of Georgia, Athens, Georgia, USA.
Ecology
|September 9, 2024
概括
变暖流加速了叶子垃圾的分解,特别是无脊椎动物和可变叶子. 这对碳循环的影响比预期的要大,可能会改变溪流生态系统.
科学领域:
- 生态生态学 生态生态学
- 环境科学 环境科学
- 生物地质化学生物地质化学
背景情况:
- 全球变暖增加了河流温度,影响了有机物 (OM) 分解和碳 (C) 循环.
- 生态代谢理论 (MTE) 预测了温度的影响,但有机体群 (微生物与无脊椎动物) 和物种的差异尚不清楚.
研究的目的:
- 为了比较由微生物介导的OM分解的温度依赖性 (激活能量,Ea),与破坏性动物相比.
- 为了评估反复的 (Rhododendron最大) 和不稳定的 (Acer rubrum) 叶子垃圾之间的温度依赖的差异.
- 根据未来的变暖情景,预测垃圾分解率的变化.
主要方法:
- 在两年内,在20个河头溪流中进行了12次60天的叶子垃圾袋化.
- 两个叶子物种的微生物和破坏性媒介分解的温度依赖性 (Ea) 的比较.
- 分析了总分解率和真菌生物质对微生物分解的影响.
主要成果:
- 在这两种叶子物种中,detritivore介导的分解比微生物分解更高的Ea.
- 反抗性 (Rhododendron) 的Ea比不稳定性 (Acer) 的Ea高.
- 预计气候变暖 (4°C升高) 可以将天数缩短至95%的质量损失,Rhododendron的40%,Acer.的26%.
结论:
- 气候变暖使得碳转移到碎食动物通路的比例比MTE预测的要快.
- 菌在微生物垃圾分解的温度依赖中发挥着关键作用.
- 随着变暖而改变的垃圾分解动态可能会加剧季节性资源限制,并改变河流中的碳储存.
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