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Soil water content as a critical factor for stable bacterial community structure and degradative activity in maritime Antarctic soil.
Kim, Dockyu; Chae, Namyi; Kim, Mincheol; Nam, Sungjin; Kim, Eungbin; Lee, Hyoungseok.
Afiliación
  • Kim D; Division of Life Sciences, Korea Polar Research Institute, Incheon, 21990, Republic of Korea. envimic@kopri.re.kr.
  • Chae N; Institutes of Life Sciences and Natural Resources, Korea University, Seoul, 02841, Republic of Korea.
  • Kim M; Division of Life Sciences, Korea Polar Research Institute, Incheon, 21990, Republic of Korea.
  • Nam S; Division of Life Sciences, Korea Polar Research Institute, Incheon, 21990, Republic of Korea.
  • Kim E; Department of Systems Biology, Yonsei University, Seoul, 03722, Republic of Korea.
  • Lee H; Division of Life Sciences, Korea Polar Research Institute, Incheon, 21990, Republic of Korea.
J Microbiol ; 58(12): 1010-1017, 2020 Dec.
Article en En | MEDLINE | ID: mdl-33263894
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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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Microbiología del Suelo / Bacterias / Microbiología del Agua / Microbiota Idioma: En Revista: J Microbiol Asunto de la revista: MICROBIOLOGIA Año: 2020 Tipo del documento: Article Pais de publicación: Corea del Sur
Texto completo
Añadir a Mi BVS
Imprimir
XML
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Microbiología del Suelo / Bacterias / Microbiología del Agua / Microbiota Idioma: En Revista: J Microbiol Asunto de la revista: MICROBIOLOGIA Año: 2020 Tipo del documento: Article Pais de publicación: Corea del Sur