More sensitive microbial responses to the interactive effects of warming and altered precipitation in subsoil than topsoil of an alpine grassland ecosystem

IF 10.8 1区 环境科学与生态学 Q1 BIODIVERSITY CONSERVATION Global Change Biology Pub Date : 2024-09-10 DOI:10.1111/gcb.17487
Qi Qi, Shijie Ning, Xue Guo, Jianshu Zhao, Renmao Tian, Haoran Gui, Jin-Sheng He, Hao Wang, Zhenhua Zhang, Konstantinos T. Konstantinidis, Qun Gao, Yuxin Wang, Shunyi Li, Weishu Zhao, Yunfeng Yang, Jizhong Zhou
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Abstract

Subsoil is a large organic carbon reservoir, storing more than half of the total soil organic carbon (SOC) globally. Conventionally, subsoil is assumed to not be susceptible to climate change, but recent studies document that climate change could significantly alter subsoil carbon cycling. However, little is known about subsoil microbial responses to the interactive effects of climate warming and altered precipitation. Here, we investigated carbon cycling and associated microbial responses in both subsoil (30–40 cm) and topsoil (0–10 cm) in a Tibetan alpine grassland over 4 years of warming and altered precipitation. Compared to the unchanged topsoil carbon (β = .55, p = .587), subsoil carbon exhibited a stronger response to the interactive effect of warming and altered precipitation (β = 2.04, p = .021), that is, warming decreased subsoil carbon content by 28.20% under decreased precipitation while warming increased subsoil carbon content by 18.02% under increased precipitation.Furthermore, 512 metagenome-assembled genomes (MAGs) were recovered, including representatives of phyla with poor genomic representation. Compared to only one changed topsoil MAG, 16 subsoil MAGs were significantly affected by altered precipitation, and 5 subsoil MAGs were significantly affected by the interactive effect of warming and precipitation. More than twice as many populations whose MAG abundances correlated significantly with the variations of carbon content, components and fluxes were observed in the subsoil than topsoil, suggesting their potential contribution in mediating subsoil carbon cycling. Collectively, our findings highlight the more sensitive responses of specific microbial lineages to the interactive effects of warming and altered precipitation in the subsoil than topsoil, and provide key information for predicting subsoil carbon cycling under future climate change scenarios.

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高寒草地生态系统底土比表土对气候变暖和降水量变化的相互作用的微生物反应更敏感
底土是一个巨大的有机碳库,储存着全球一半以上的土壤有机碳(SOC)。人们通常认为底土不会受到气候变化的影响,但最近的研究表明,气候变化会显著改变底土的碳循环。然而,人们对底土微生物对气候变暖和降水变化的交互影响的反应知之甚少。在此,我们研究了西藏高寒草原在气候变暖和降水改变的 4 年中底土(30-40 厘米)和表土(0-10 厘米)的碳循环及相关微生物反应。与不变的表土碳(β = .55,p = .587)相比,底土碳在气候变暖和降水变化的交互作用下表现出更强的响应(β = 2.04,p = .021),即在降水减少的情况下,气候变暖使底土碳含量减少了 28.20%,而在降水增加的情况下,气候变暖使底土碳含量增加了 18.02%。与只有一个发生变化的表土基因组相比,16个底土基因组受到降水变化的显著影响,5个底土基因组受到气候变暖和降水交互作用的显著影响。在底土中观察到的 MAG 丰度与碳含量、碳组分和碳通量变化显著相关的种群数量是表土的两倍多,这表明它们在调解底土碳循环中的潜在贡献。总之,我们的研究结果突出表明,与表层土壤相比,底土中特定微生物种群对气候变暖和降水变化的交互影响反应更为敏感,这为预测未来气候变化情景下的底土碳循环提供了关键信息。
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来源期刊
Global Change Biology
Global Change Biology 环境科学-环境科学
CiteScore
21.50
自引率
5.20%
发文量
497
审稿时长
3.3 months
期刊介绍: Global Change Biology is an environmental change journal committed to shaping the future and addressing the world's most pressing challenges, including sustainability, climate change, environmental protection, food and water safety, and global health. Dedicated to fostering a profound understanding of the impacts of global change on biological systems and offering innovative solutions, the journal publishes a diverse range of content, including primary research articles, technical advances, research reviews, reports, opinions, perspectives, commentaries, and letters. Starting with the 2024 volume, Global Change Biology will transition to an online-only format, enhancing accessibility and contributing to the evolution of scholarly communication.
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