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亚北极冬季的变暖促进了土壤微生物对融周期的抵抗力,并提高了微生物碳使用效率
Jin-Tao Lí1,2,3, Lettice C Hicks1,3, Albert C Brangarí1,3
1Department of Biology, Microbial Biogeochemistry in Lund (MBLU), Lund University, Lund, Sweden.
Global change biology
|January 26, 2024
概括
气候变化正在导致亚北极地区更多的土壤结-解周期. 预先变暖改善了微生物生长对这些循环的弹性,提高了碳使用效率.
科学领域:
- 环境科学 环境科学
- 微生物学 微生物学
- 气候变化研究 气候变化研究
背景情况:
- 预计气候变化将增加亚北极地区的土壤结-解周期.
- 微生物群落面临着新的环境挑战,因为这些变化的条件.
- 微生物"记忆"或"压力遗留"的概念表明,先前暴露于压力因素可以提高弹性.
研究的目的:
- 调查冬季变暖的历史和增加的冷解周期是否提高了土壤微生物对随后的冷解干扰的抵抗力.
- 确定冬季变暖如何影响微生物生长和呼吸的弹性.
- 评估气候历史对微生物碳利用效率的影响.
主要方法:
- 在一个亚北极树林中进行了现场实地实验.
- 应用了冬季变暖,增加了融事件的数量和强度.
- 测量了土壤微生物生长和对实验冷-解扰动的呼吸反应.
主要成果:
- 冬季的变暖显著提高了土壤微生物生长对融周期的弹性.
- 在冬季变暖下,细菌的弹性比真菌的弹性更强.
- 微生物呼吸对冷解的反应不受先前变暖的影响,但碳利用效率得到了提高.
结论:
- 冬季变暖的历史和增加的冷解周期可以改善土壤微生物生长弹性.
- 在变暖下提高微生物碳利用效率可能会促进土壤碳稳定.
- 气候历史对于了解土壤微生物对气候变化干扰的反应及其对生物地化学循环的影响至关重要.
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