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Nitrogen balance along a northern boreal forest fire chronosequence
Marjo Palviainen1; Jukka Pumpanen2; Frank Berninger1; Kaisa Ritala1; Baoli Duan3; Jussi Heinonsalo4; Hui Sun4,5; Egle Köster1; Kajar Köster1
Corresponding AuthorMarjo Palviainen
Source PublicationPLOS ONE

Fire is a major natural disturbance factor in boreal forests, and the frequency of forest fires is predicted to increase due to climate change. Nitrogen (N) is a key determinant of carbon sequestration in boreal forests because the shortage of N limits tree growth. We studied changes in N pools and fluxes, and the overall N balance across a 155-year non stand replacing fire chronosequence in sub-arctic Pinus sylvestris forests in Finland. Two years after the fire, total ecosystem N pool was 622 kg ha(-1) of which 16% was in the vegetation, 8% in the dead biomass and 76% in the soil. 155 years after the fire, total N pool was 960 kg ha(-1), with 27% in the vegetation, 3% in the dead biomass and 69% in the soil. This implies an annual accumulation rate of 2.28 kg ha(-1) which was distributed equally between soil and biomass. The observed changes in N pools were consistent with the computed N balance +2.11 kg ha(-1) yr(-1) over the 155-year post-fire period. Nitrogen deposition was an important component of the N balance. The biological N fixation increased with succession and constituted 9% of the total N input during the 155 post-fire years. N2O fluxes were negligible (< 0.01 kg ha(-1) yr(-1)) and did not differ among post-fire age classes. The number and intensity of microbial genes involved in N cycling were lower at the site 60 years after fire compared to the youngest and the oldest sites indicating potential differences in soil N cycling processes. The results suggest that in sub-arctic pine forests, the non-stand-replacing, intermediate severity fires decrease considerably N pools in biomass but changes in soil and total ecosystem N pools are slight. Current fire-return interval does not seem to pose a great threat to ecosystem productivity and N status in these sub-arctic forests.

KeywordScots Pine Norway Spruce Soil Carbon Jack Pine Wildfire Chronosequence Coniferous Forest Nutrient Budgets Interior Alaska Feather Mosses Climate-change
Indexed BySCI
WOS IDWOS:000399174800077
Citation statistics
Cited Times:9[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Affiliation1.Univ Helsinki, Dept Forest Sci, Helsinki, Finland
2.Univ Eastern Finland, Dept Environm & Biol Sci, Kuopio, Finland
3.Inst Mt Hazards & Environm, Chengdu, Peoples R China
4.Univ Helsinki, Dept Food & Environm Sci, Helsinki, Finland
5.Nanjing Forestry Univ, Collaborat Innovat Ctr Sustainable Forestry South, Coll Forestry, Nanjing, Jiangsu, Peoples R China
Recommended Citation
GB/T 7714
Marjo Palviainen,Jukka Pumpanen,Frank Berninger,et al. Nitrogen balance along a northern boreal forest fire chronosequence[J]. PLOS ONE,2017:e0174720.
APA Marjo Palviainen.,Jukka Pumpanen.,Frank Berninger.,Kaisa Ritala.,Baoli Duan.,...&Kajar Köster.(2017).Nitrogen balance along a northern boreal forest fire chronosequence.PLOS ONE,e0174720.
MLA Marjo Palviainen,et al."Nitrogen balance along a northern boreal forest fire chronosequence".PLOS ONE (2017):e0174720.
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