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火灾改变了陆地补贴对水生生态系统结构和功能的影响

Christopher B Wall¹, Cody J Spiegel¹, Evelyn M Diaz¹

¹Department of Ecology, Behavior and Evolution, Division of Biological Sciences, University of California, San Diego, California, USA.

Global change biology

|January 26, 2024

概括

野火通过改变植物碎片来改变水生生态系统. 燃烧会增加营养,影响碳循环和食物网,对淡水池功能产生重大影响.

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:

由于气候变化,野火正在增加,影响着陆地生态系统.
火灾对水生生态系统中的陆地有机物补贴的影响仍然不太清楚.
了解这些影响对于预测生态系统对全球变化的反应至关重要.

研究的目的:

研究燃烧与未燃烧的陆地碎片对淡水池生态系统功能的影响.
确定火如何改变碎片的化学成分及其对水生系统的后续影响.
评估火灾引起的碎片变化对碳循环,新陈代谢和热量转移的影响.

主要方法:

一个梯度设计实验使用淡水池 mesocosms.
添加不同数量的燃烧和未燃烧的植物碎片.
在89天内监测溶解有机碳 (DOC),生态系统代谢,温室气体 (CO2,CH4) 和热量转移.

主要成果:

陆地补贴对生态系统功能产生了时间和质量依赖的非线性影响.
燃烧增加了碎片的营养含量,导致更低的DOC和CO2,并在59日之前在中宇宙中增加了DO.
火焰放大了碎片对新陈代谢的影响,刺激了光合作用和呼吸,但也诱导了低氧和高负荷的代谢不稳定.
火灾改变了食物转移,减少了陆地碎片的加入到水生食物网中.

结论:

火在化学上转化了植物废物,改变了它在水生碳处理和储存中的作用.
野火可以诱导生态系统功能的转变,这些功能是水生和陆生息地之间的桥梁.
这些发现凸显了火灾对淡水生态系统动态的重大,但被低估的影响.

关键词:

溶解的有机碳是什么?浮游生物是一种浮游生物.生产力生产力生产率的提高.热生成的烧制剂获得奖杯的转移.

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