植物和分解剂之间的菌根媒介竞争推动了土壤碳储存
Colin Averill1, Benjamin L Turner2, Adrien C Finzi3
1Department of Integrative Biology, Graduate Program in Ecology, Evolution and Behavior, University of Texas at Austin, Austin, Texas 78712, USA.
Nature
|January 10, 2014
概括
在生态系统中,土壤碳储存量与状菌和状菌 (EEM) 菌相比,与状菌 (AM) 菌相比,显著更高. 这种差异是由真菌的营养竞争驱动的,影响全球碳循环.
科学领域:
- 土壤科学 土壤科学
- 生态生态学 生态生态学
- 菌类学 菌类学是指菌类学.
背景情况:
- 土壤有机碳超过大气和植被碳的总和.
- 了解土壤碳动态对于气候变化预测至关重要.
- 土壤有机物的微生物分解通常受到的可用性限制.
研究的目的:
- 研究菌根类真菌在调节土壤碳储存中的作用.
- 为了测试这种预测,ectomycorrhizal (EEM) 和ericoid mycorrhizal (EEM) 菌类比状mycorrhizal (AM) 菌类促进更多的土壤碳.
主要方法:
- 利用全球数据集来比较由EEM相关植物主导的生态系统中的土壤碳含量与AM相关植物.
- 分析了每单位的土壤碳作为一个关键指标.
- 评估了菌根类型的影响,独立于其他因素,如净初级产量,温度,降水量和土壤粘土含量.
主要成果:
- 与AM相关植物主导的生态系统相比,由EEM相关植物主导的生态系统显示,每单位的土壤碳比AM相关植物主导的生态系统多70%.
- 菌根类型对土壤碳的影响很大,并且独立于其他环境因素.
- 这种效应在全球范围内是一致的.
结论:
- 菌根真菌类型显著影响陆地碳储存.
- 植物-分解者对营养的竞争,由菌根菌媒介,是全球碳循环的基本控制.
- 菌根真菌的功能特征对碳封存具有生态系统到全球范围的影响.
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