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$CO_{2}$, $CH_{4}$and $N_{2}$O fluxes of upland black spruce (Picea mariana) forest soils after forest fires of different intensity in interior Alaska
| Content Provider | Scilit |
|---|---|
| Author | Morishita, Tomoaki Noguchi, Kyotaro Kim, Yongwon Matsuura, Yojiro |
| Copyright Year | 2014 |
| Description | Forest fires can change the greenhouse gase (GHG) flux of borea forest soils. We measured carbon dioxide $(CO_{2}$), methane $(CH_{4}$) and nitrous oxide $(N_{2}$O) fluxes with different burn histories in black spruce (Picea mariana) stands in interior Alaska. The control forest (CF) burned in 1920; partially burned (PB) in 1999; and severely burned (SB1 and SB2) in 2004. The thickness of the organic layer was 22 ± 6 cm at CF, 28 ± 10 cm at PB, 12 ± 6 cm at SB1 and 4 ± 2 cm at SB2. The mean soil temperature during $CO_{2}$ flux measurement was 8.9 ± 3.1, 6.4 ± 2.1, 5.9 ± 3.4 and 5.0 ± 2.4°C at SB2, SB1, PB and CF, respectively, and differed significantly among the sites (P < 0.01). The mean $CO_{2}$ flux was highest at PB (128 ± 85 mg $CO_{2}$-C $m^{−2}$ $h^{−1}$) and lowest at SB1 (47 ± 19 mg $CO_{2}$-C $m^{−2}$ $h^{−1}$) (P < 0.01), and within each site it was positively correlated with soil temperature (P < 0.01). The $CO_{2}$ flux at SB2 was lower than that at CF when the soil temperature was high. We attributed the low $CO_{2}$ flux at SB1 and SB2 to low root respiration and organic matter decomposition rates due to the 2004 fire. The $CH_{4}$ uptake rate was highest at SB1 [–91 ± 21 μg $CH_{4}$-C $m^{−2}$ $h^{−1}$] (P < 0.01) and positively correlated with soil temperature (P < 0.01) but not soil moisture. The $CH_{4}$ uptake rate increased with increasing soil temperature because methanotroph activity increased. The $N_{2}$O flux was highest [3.6 ± 4.7 μg $N_{2}$O-N $m^{−2}$ $h^{−1}$] at PB (P < 0.01). Our findings suggest that the soil temperature and moisture are important factors of GHG dynamics in forest soils with different fire history. |
| Related Links | https://www.tandfonline.com/doi/pdf/10.1080/00380768.2014.963666?needAccess=true |
| ISSN | 00380768 |
| e-ISSN | 17470765 |
| DOI | 10.1080/00380768.2014.963666 |
| Journal | Soil Science and Plant Nutrition |
| Issue Number | 1 |
| Volume Number | 61 |
| Language | English |
| Publisher | Informa UK Limited |
| Publisher Date | 2014-09-30 |
| Access Restriction | Open |
| Subject Keyword | Forestry Alaska Forest Fire |
| Content Type | Text |
| Resource Type | Article |
| Subject | Soil Science Plant Science |
