Passive warming effect on soil microbial community and humic substance degradation in maritime Antarctic region

dc.creatorKim, Dockyu
dc.creatorPark, Ha Ju
dc.creatorKim, Jung Ho
dc.creatorYoun, Ui Joung
dc.creatorYang, Yung Hun
dc.creatorCasanova Katny, Angelica
dc.creatorMunoz Vargas, Cristina
dc.creatorVenegas, Erick Zagal
dc.creatorPark, Hyun
dc.creatorHong, Soon Gyu
dc.date2018
dc.date2021-04-30T16:59:14Z
dc.date2021-04-30T16:59:14Z
dc.date.accessioned2021-06-14T22:07:36Z
dc.date.available2021-06-14T22:07:36Z
dc.identifierJOURNAL OF BASIC MICROBIOLOGY,Vol.58,513-522,2018
dc.identifierhttp://repositoriodigital.uct.cl/handle/10925/3767
dc.identifier10.1002/jobm.201700470
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/3301117
dc.descriptionAlthough the maritime Antarctic has undergone rapid warming, the effects on indigenous soil-inhabiting microorganisms are not well known. Passive warming experiments using open-top chamber (OTC) have been performed on the Fildes Peninsula in the maritime Antarctic since 2008. When the soil temperature was measured at a depth of 2-5cm during the 2013-2015 summer seasons, the mean temperature inside OTC (OTC-In) increased by approximately 0.8 degrees C compared with outside OTC (OTC-Out), while soil chemical and physical characteristics did not change. Soils (2015 summer) from OTC-In and OTC-Out were subjected to analysis for change in microbial community and degradation rate of humic substances (HS, the largest pool of recalcitrant organic carbon in soil). Archaeal and bacterial communities in OTC-In were minimally affected by warming compared with those in OTC-Out, with archaeal methanogenic Thermoplasmata slightly increased in abundance. The abundance of heterotrophic fungi Ascomycota was significantly altered in OTC-In. Total bacterial and fungal biomass in OTC-In increased by 20% compared to OTC-Out, indicating that this may be due to increased microbial degradation activity for soil organic matter (SOM) including HS, which would result in the release of more low-molecular-weight growth substrates from SOM. Despite the effects of warming on the microbial community over the 8-years-experiments warming did not induce any detectable change in content or structure of polymeric HS. These results suggest that increased temperature may have significant and direct effects on soil microbial communities inhabiting maritime Antarctic and that soil microbes would subsequently provide more available carbon sources for other indigenous microbes.
dc.languageen
dc.publisherWILEY
dc.sourceJOURNAL OF BASIC MICROBIOLOGY
dc.subjectAntarctic soil
dc.subjectdegradation
dc.subjecthumic substances
dc.subjectmicrobial community
dc.titlePassive warming effect on soil microbial community and humic substance degradation in maritime Antarctic region
dc.typeArticle


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