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温度驱动着主要微生物在地表土壤群落中的大陆范围分布
Ferran Garcia-Pichel1, Virginia Loza, Yevgeniy Marusenko
1School of Life Sciences, Arizona State University, Tempe, AZ 85287, USA. ferran@asu.edu
Science (New York, N.Y.)
|July 2, 2013
概括
全球变暖影响土壤微生物. 温度变化导致北美干旱地区主导的蓝藻细菌物种的转变,可能会改变土壤健康.
科学领域:
- 微生物学 微生物学
- 生态生态学 生态生态学
- 气候变化科学 气候变化科学
背景情况:
- 全球变暖需要陆地物种迁移,但微生物的反应是未知的.
- 土壤地微生物群落在干旱生态系统功能中起着至关重要的作用.
研究的目的:
- 研究温度对土壤微生物群落的影响,特别是北美干旱地区的土壤上层蓝藻菌.
- 预测由于气候变化而导致微生物社区组成的潜在变化.
主要方法:
- 大陆范围内对土壤地微生物群落的组成调查.
- 对主导的蓝藻细菌的度分布模式的分析.
- 实验室对丰富培养和培养菌株进行实验,以评估温度耐受性.
主要成果:
- 观察到两个关键的表层土壤蓝藻细菌 (Microcoleus vaginatus和M. steenstrupii) 之间的度替换占主导地位,主要是由温度驱动的.
- 与M. steenstrupii相比,Microcoleus vaginatus表现出更大的心理耐受性和较低的热耐受性.
- 气候预测表明,M. steenstrupii可能会在几十年内在广大地区取代M. vaginatus.
结论:
- 温度是干旱地区土壤蓝藻细菌分布的重要驱动因素.
- 预计气候变暖可能会导致土壤中占主导地位的蓝藻细菌发生显著的变化,这可能会产生潜在的生态后果.
- 由于这些微生物社区的转变,土壤肥力和侵蚀性的未来变化是可能的.
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