Extreme drought with seasonal timing consistently promotes CH4 uptake through inconsistent pathways in a temperate grassland, China

IF 2.7 3区 环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES
Wenwen Zhang, Yue Pan, Fuqi Wen, Juanjuan Fu, Yanbin Hao, Tianming Hu, Peizhi Yang
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Abstract

Methane (CH4) is a potent greenhouse gas that has a substantial impact on global warming due to its substantial influence on the greenhouse effect. Increasing extreme precipitation events, such as drought, attributable to global warming that caused by greenhouse gases, exert a profound impact on the intricate biological processes associated with CH4 uptake. Notably, the timing of extreme drought occurrence emerges as a pivotal factor influencing CH4 uptake, even when the degree of drought remains constant. However, it is still unclear how the growing season regulates the response of CH4 uptake to extreme drought. In an effort to bridge this knowledge gap, we conducted a field manipulative experiment to evaluate the impact of extreme drought on CH4 uptake during early, middle, and late growing stages in a temperate steppe of Inner Mongolia Autonomous Region, China. The result showed that all extreme drought consistently exerted positive effects on CH4 uptake regardless of seasonal timing. However, the magnitude of this effect varied depending on the timing of season, as evidenced by a stronger effect in early growing stage than in middle and late growing stages. Besides, the pathways of CH4 uptake were different from seasonal timing. Extreme drought affected soil physical-chemical properties and aboveground biomass (AGB), consequently leading to changes in CH4 uptake. The structural equation model showed that drought both in the early and middle growing stages enhanced CH4 uptake due to reduced soil water content (SWC), leading to a decrease in NO3-N and an increase in pmoA abundance. However, drought in late growing stage primarily enhanced CH4 uptake only by decreasing SWC. Our results suggested that seasonal timing significantly contributed to regulate the impacts of extreme drought pathways and magnitudes on CH4 uptake. The findings can provide substantial implications for understanding how extreme droughts affect CH4 uptake and improve the prediction of potential ecological consequence under future climate change.

中国温带草原的季节性极端干旱通过不一致的途径持续促进甲烷吸收
甲烷(CH4)是一种强效温室气体,由于其对温室效应的巨大影响,对全球变暖产生了重大影响。由温室气体引起的全球变暖导致干旱等极端降水事件不断增加,对与吸收 CH4 相关的复杂生物过程产生了深远影响。值得注意的是,即使干旱程度保持不变,极端干旱发生的时间也是影响甲烷吸收的关键因素。然而,目前还不清楚生长季节是如何调节 CH4 吸收对极端干旱的响应的。为了弥补这一知识空白,我们在中国内蒙古自治区的温带大草原上进行了一项田间操作实验,以评估极端干旱对早、中、晚生长期CH4吸收的影响。结果表明,无论季节时间如何,所有极端干旱都对CH4吸收产生积极影响。然而,这种影响的程度因季节时间的不同而不同,表现为生长初期的影响强于生长中期和后期。此外,CH4 吸收的途径也与季节时间不同。极端干旱影响了土壤的物理化学性质和地上生物量(AGB),从而导致了CH4吸收量的变化。结构方程模型表明,生长初期和中期的干旱会因土壤含水量(SWC)的降低而促进CH4的吸收,导致NO3--N的减少和pmoA丰度的增加。然而,生长后期的干旱主要是通过降低土壤水分含量来提高对CH4的吸收。我们的研究结果表明,季节时机在很大程度上调节了极端干旱的途径和程度对CH4吸收的影响。这些研究结果对理解极端干旱如何影响CH4吸收以及改进未来气候变化下潜在生态后果的预测具有重要意义。
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来源期刊
Journal of Arid Land
Journal of Arid Land ENVIRONMENTAL SCIENCES-
CiteScore
4.70
自引率
6.70%
发文量
768
审稿时长
3.2 months
期刊介绍: The Journal of Arid Land is an international peer-reviewed journal co-sponsored by Xinjiang Institute of Ecology and Geography, the Chinese Academy of Sciences and Science Press. It aims to meet the needs of researchers, students and practitioners in sustainable development and eco-environmental management, focusing on the arid and semi-arid lands in Central Asia and the world at large. The Journal covers such topics as the dynamics of natural resources (including water, soil and land, organism and climate), the security and sustainable development of natural resources, and the environment and the ecology in arid and semi-arid lands, especially in Central Asia. Coverage also includes interactions between the atmosphere, hydrosphere, biosphere, and lithosphere, and the relationship between these natural processes and human activities. Also discussed are patterns of geography, ecology and environment; ecological improvement and environmental protection; and regional responses and feedback mechanisms to global change. The Journal of Arid Land also presents reviews, brief communications, trends and book reviews of work on these topics.
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