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- Soil water content as a critical factor for stable bacterial community structure and degradative activity in maritime Antarctic soil
- Dockyu Kim , Namyi Chae , Mincheol Kim , Sungjin Nam , Eungbin Kim , Hyoungseok Lee
- J. Microbiol. 2020;58(12):1010-1017. Published online December 2, 2020
- DOI: https://doi.org/10.1007/s12275-020-0490-9
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Abstract
- Recent increases in air temperature across the Antarctic Peninsula may prolong the thawing period and directly affect the soil temperature (Ts) and volumetric soil water content (SWC) in maritime tundra. Under an 8°C soil warming scenario, two customized microcosm systems with maritime Antarctic soils were incubated to investigate the differential influence of SWC on the bacterial community and degradation activity of humic substances (HS), the largest constituent of soil organic carbon and a key component of the terrestrial ecosystem. When the microcosm soil (KS1-4Feb) was incubated for 90 days (T = 90) at a constant SWC of ~32%, the initial HS content (167.0 mg/g of dried soil) decreased to 156.0 mg (approximately 6.6% loss, p < 0.05). However, when another microcosm soil (KS1-4Apr) was incubated with SWCs that gradually decreased from 37% to 9% for T = 90, HS degradation was undetected. The low HS degradative activity persisted, even after the SWC was restored to 30% with water supply for an additional T = 30. Overall bacterial community structure remained relatively stable at a constant SWC setting (KS1-4Feb). In contrast, we saw marked shifts in the bacterial community structure with the changing SWC regimen (KS1-4Apr), suggesting that the soil bacterial communities are vulnerable to drying and re-wetting conditions. These microcosm experiments provide new information regarding the effects of constant SWC and higher Ts on bacterial communities for HS degradation in maritime Antarctic tundra soil.
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- Microbial metabolic responses and CO2 emissions differentiated by soil water content variation in subarctic tundra soils
Dockyu Kim, Namyi Chae, Mincheol Kim, Sungjin Nam, Tai Kyoung Kim, Ki-Tea Park, Bang Yong Lee, Eungbin Kim, Hyoungseok Lee
Journal of Microbiology.2022; 60(12): 1130. CrossRef - Temperature sensitivity of Antarctic soil‐humic substance degradation by cold‐adapted bacteria
Dockyu Kim, Ha Ju Park, Mincheol Kim, Seulah Lee, Soon Gyu Hong, Eungbin Kim, Hyoungseok Lee
Environmental Microbiology.2022; 24(1): 265. CrossRef - Seasonal patterns of rhizosphere microorganisms suggest carbohydrate-degrading and nitrogen-fixing microbes contribute to the attribute of full-year shooting in woody bamboo Cephalostachyum pingbianense
Lushuang Li, Tize Xia, Hanqi Yang
Frontiers in Microbiology.2022;[Epub] CrossRef
- Microbial metabolic responses and CO2 emissions differentiated by soil water content variation in subarctic tundra soils
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