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Laboratory examination of greenhouse gaseous and microbial dynamics during thawing of frozen soil core collected from a black spruce forest in Interior Alaska
| Content Provider | Scilit |
|---|---|
| Author | Nagano, Hirohiko Kim, Yongwon Lee, Bang-Yong Shigeta, Haruka Inubushi, Kazuyuki |
| Copyright Year | 2018 |
| Abstract | In this study, we conducted an incubation experiment on a frozen soil core collected from a black spruce forest in Interior Alaska, in order to investigate potential changes in greenhouse gaseous (GHG) and microbial dynamics during thawing of frozen soil. The soil thawing is an important environmental process determining the annual GHG balance in the northern high-latitude ecosystem. A core spanning the ground surface to upper permafrost with a depth of 90 cm was vertically grouped into three layers (top, middle, and bottom layers). Then, 12 soil samples from 3 layers (i.e., 4 soil samples per layer) were incubated for 3 weeks, and net carbon dioxide $(CO_{2}$) and methane $(CH_{4}$) release/uptake rates were estimated. During the incubation, temperature was changed weekly from 0 to 5, then 10°C. The net amounts of $CO_{2}$ released by six of the eight soil samples from the top and middle layers were 1.5–19.2-fold greater at 5°C than at 0°C, while the release at 10°C was reduced in the cases of three of these six soil samples. Net $CH_{4}$ release was the greatest in bottom-layer soil samples incubated at 0°C. Then, low but apparent $CH_{4}$ release was observed in top and middle-layer soil samples incubated at 0°C. At 5 and 10°C, net $CH_{4}$ release from bottom-layer soil samples was decreased. Then, net $CH_{4}$ uptake was observed in the top and the middle-layer soil samples. Both net uptake and release of $CH_{4}$ were reduced upon the addition of a chemical inhibitor (i.e., 2-bromoethane sulfonate) of anaerobic methanotrophic and methanogenic activity. The bacterial and archaeal community structures based on 16S rRNA amplicon analysis were changed along the depth, while they were less changed during thawing. Thus, it was found that soil GHG dynamics responded sensitively and variously to thawing, while there was less change in 16S rRNA-based microbial community structures during the thawing progress. |
| Related Links | https://www.tandfonline.com/doi/pdf/10.1080/00380768.2018.1525267?needAccess=true |
| Ending Page | 802 |
| Page Count | 10 |
| Starting Page | 793 |
| ISSN | 00380768 |
| e-ISSN | 17470765 |
| DOI | 10.1080/00380768.2018.1525267 |
| Journal | Soil Science and Plant Nutrition |
| Issue Number | 6 |
| Volume Number | 64 |
| Language | English |
| Publisher | Informa UK Limited |
| Publisher Date | 2018-11-02 |
| Access Restriction | Open |
| Subject Keyword | Journal: Soil Science and Plant Nutrition Forestry Soil Science Black Spruce Forest Greenhouse Gas Next-generation Sequencing Permafrost Soil Thaw |
| Content Type | Text |
| Resource Type | Article |
| Subject | Soil Science Plant Science |
