Journal Article Accumulation of carbon and nitrogen in vegetation and soils of deglaciated area in Ellesmere Island, high-Arctic Canada

10 ( 3 )  , pp.288 - 296 , 2016-09
ISSN:18739652
Description
The amount of biomass, carbon (C), and nitrogen (N) in vegetation and soil were measured at two spatial scales in the high Arctic. At the scale of proglacial landscape, the amount of C and N in aboveground and belowground parts of vegetation, surface litter, and soil were significantly affected by the habitat (moraines vs hummocks), the relative age of the terrain after the deglaciation, and/or the vegetation. At another scale, we focused on mudboils as an agent of local disturbance in the vegetation and soil of the glacier foreland. The biomass and the amount of C and N in aboveground vegetation, surface litter, biological soil crust, and soil were generally increased with the stage of mudboils' inactivation. Biomass, C, and N in aboveground vegetation and surface litter were generally greater at moraine than at hummock, whereas those in biological soil crust and soil were greater at hummock. Principal component analysis identified two pathways, xeric and mesic ones on moraines and hummocks, respectively, of C and N accumulation both at the two spatial scales. These results suggested that the C and N accumulation was not linearly related to the time since deglaciation and that moisture condition, vegetation, and mudboil activity were locally important.
カナダ高緯度北極に位置する氷河後退域において、植生および土壌の炭素・窒素の蓄積量を調べた。氷河後退域全域を対象とした調査から、植生の地上部と地下部、地表のリター、および土壌の炭素・窒素量は、立地の水分条件、氷河後退後の年代、および植生により差が認められた。また植生の地上部、地表のリター、生物土膜、および土壌の炭素・窒素量は、周氷河地形であるマッドボイルの不活性化の段階を経るにともない増加しており、マッドボイルの出現が植生と土壌の局所的なかく乱を引き起こすことが示された。主成分分析の結果、立地の水分条件が炭素・窒素量の蓄積パターンに影響を及ぼす主要因であることが明らかとなった。

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