Temperature fluctuation promotes the thermal adaptation of soil microbial respiration

Zhang, Yan; Li, Jintao; Xu, Xiao; Chen, Hong-Yang; Zhu, Ting; Xu, Jianjun; Xu, Xiaoni; Li, Jinquan; Liang, Chao; Li, Bo; Fang, Changming; Nie, Ming

doi:10.1038/s41559-022-01944-3

Cited by 20 publications

(5 citation statements)

References 70 publications

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“…Re increased quasi-exponentially with air temperature (Figure 5c), which is consistent with the experiments that both autotrophic respiration and soil microbial respiration increase exponentially with mean temperature before reaching an optimum [50][51][52][53]. In addition, the temperature fluctuations can also influence the soil microbial respiration [54]. Therefore, the random forest analysis indicated that air temperature was the most important predictor of Re (Figure 4c).…”

Section: Biophysical Controls Of Carbon Fluxessupporting

confidence: 86%

Variations in CO2 and CH4 Exchange in Response to Multiple Biophysical Factors from a Mangrove Wetland Park in Southeastern China

et al. 2023

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Mangrove ecosystems can be both significant sources and sinks of greenhouse gases. The restoration of mangrove forests is increasingly used as a natural climate solution tool to mitigate climate change. However, the estimates of carbon exchanges remain unclear, especially from restored mangroves. In this study, we observed the temporal variations in carbon dioxide (CO2) and methane (CH4) fluxes and their biophysical controls for 4 years, based on a closed-path eddy covariance (EC) system. The measurements were conducted in a mangrove wetland park with 14-year-old restored mangroves surrounded by open waters in Guangdong Province, China. The EC measurements showed that the mangrove ecosystem acted as a CO2 source with a net CO2 ecosystem exchange (NEE) of 305 g C m−2 from January 2019 to May 2020 by the 5-m tower measurement. After the tower was adjusted to 10 m, the mangrove showed a CO2 sink with an NEE of −345 g C m−2 from June 2020 to December 2022. The change in tower height influenced the interpretation of interannual trends on NEE. There were no significant interannual trends in the gross primary productivity (GPP) and the ecosystem respiration (Re) values. The change from CO2 source to sink may be attributed to the decrease in land surface proportion by the tower replacement, which reduces the proportion of the mangrove canopy respiration and, therefore, captures lower CO2 fluxes from open waters. The restored mangroves indicated strong CH4 sources of 23.2–26.3 g C m−2 a−1. According to the random forest analysis, the land surface proportion, radiation, and relative humidity were the three most important predictors of NEE, while the CH4 flux was most sensitive to air temperature. Compared to the natural and long-term restored mangroves, this 14-year-old restored mangrove had not yet achieved a maximum carbon sequestration capability. Our study highlights the need for the careful design of long-term observations from restored mangroves and proposes future needs in the context of carbon neutrality.

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Section: Biophysical Controls Of Carbon Fluxessupporting

confidence: 86%

Variations in CO2 and CH4 Exchange in Response to Multiple Biophysical Factors from a Mangrove Wetland Park in Southeastern China

et al. 2023

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“…Theory and observations to convert dynamic ‘hot moments’ to long‐term consequences for stable C pools have yet to be developed (Kuzyakov & Blagodatskaya, 2015). Indeed, soil microbial communities and functioning frequently deviate from predictions based on changes in mean climatic conditions without accounting for temporal fluctuations and extremes (Harris et al., 2018; Placella et al., 2012; Zhang et al., 2023; Zhu & Cheng, 2011). Therefore, more studies measuring microbial CUE during the course of perturbation events, along with theoretical development and modelling to upscale such dynamic behaviour (e.g.…”

Section: Discussionmentioning

confidence: 99%

Subarctic winter warming promotes soil microbial resilience to freeze–thaw cycles and enhances the microbial carbon use efficiency

Lí,

Hicks,

Brangarí

et al. 2023

Global Change Biology

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Climate change is predicted to cause milder winters and thus exacerbate soil freeze–thaw perturbations in the subarctic, recasting the environmental challenges that soil microorganisms need to endure. Historical exposure to environmental stressors can facilitate the microbial resilience to new cycles of that same stress. However, whether and how such microbial memory or stress legacy can modulate microbial responses to cycles of frost remains untested. Here, we conducted an in situ field experiment in a subarctic birch forest, where winter warming resulted in a substantial increase in the number and intensity of freeze–thaw events. After one season of winter warming, which raised mean surface and soil (−8 cm) temperatures by 2.9 and 1.4°C, respectively, we investigated whether the in situ warming‐induced increase in frost cycles improved soil microbial resilience to an experimental freeze–thaw perturbation. We found that the resilience of microbial growth was enhanced in the winter warmed soil, which was associated with community differences across treatments. We also found that winter warming enhanced the resilience of bacteria more than fungi. In contrast, the respiration response to freeze–thaw was not affected by a legacy of winter warming. This translated into an enhanced microbial carbon‐use efficiency in the winter warming treatments, which could promote the stabilization of soil carbon during such perturbations. Together, these findings highlight the importance of climate history in shaping current and future dynamics of soil microbial functioning to perturbations associated with climate change, with important implications for understanding the potential consequences on microbial‐mediated biogeochemical cycles.

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“…Our study aimed to encompass a representative range of temperatures that would elicit differential responses from these microbial communities. Based on previous studies (Chen et al., 2020; Tian et al., 2022; Zhang et al., 2023), we incubated 200 g of field soil, maintained at 60% of its WHC, within 500 mL containers at five different temperatures: 8, 15, 20, 25, and 35°C. These temperatures were selected to span the range from colder to warmer conditions, allowing us to observe the behavior and adaptability of soil microorganisms across this spectrum.…”

Section: Methodsmentioning

confidence: 99%

Intrinsic microbial temperature sensitivity and soil organic carbon decomposition in response to climate change

Li,

Delgado‐Baquerizo,

Ding

et al. 2024

Global Change Biology

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Soil microbes are essential for regulating carbon stocks under climate change. However, the uncertainty surrounding how microbial temperature responses control carbon losses under warming conditions highlights a significant gap in our climate change models. To address this issue, we conducted a fine‐scale analysis of soil organic carbon composition under different temperature gradients and characterized the corresponding microbial growth and physiology across various paddy soils spanning 4000 km in China. Our results showed that warming altered the composition of organic matter, resulting in a reduction in carbohydrates of approximately 0.026% to 0.030% from humid subtropical regions to humid continental regions. These changes were attributed to a decrease in the proportion of cold‐preferring bacteria, leading to significant soil carbon losses. Our findings suggest that intrinsic microbial temperature sensitivity plays a crucial role in determining the rate of soil organic carbon decomposition, providing insights into the temperature limitations faced by microbial activities and their impact on soil carbon‐climate feedback.

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Temperature fluctuation promotes the thermal adaptation of soil microbial respiration

Cited by 20 publications

References 70 publications

Variations in CO2 and CH4 Exchange in Response to Multiple Biophysical Factors from a Mangrove Wetland Park in Southeastern China

Variations in CO2 and CH4 Exchange in Response to Multiple Biophysical Factors from a Mangrove Wetland Park in Southeastern China

Subarctic winter warming promotes soil microbial resilience to freeze–thaw cycles and enhances the microbial carbon use efficiency

Intrinsic microbial temperature sensitivity and soil organic carbon decomposition in response to climate change

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