Fine root production and turnover of tree and understorey vegetation in Scots pine, silver birch and Norway spruce stands in SW Sweden

FOREST ECOLOGY AND MANAGEMENT

卷:309

Article

Hansson, Karna¹  Helmisaari, Helja-Sisko²  Sah, Shambhu P.³  Lange, Holger⁴ 

[1] Swedish Univ Agr Sci, Dept Ecol, SE-75007 Uppsala, Sweden

[2] Univ Helsinki, Dept Forest Sci, FI-00014 Helsinki, Finland

[3] Finnish Forest Res Inst, FI-01301 Vantaa, Finland

[4] Norwegian Forest & Landscape Inst, NO-1431 As, Norway

关键词: Picea abies;    Pinus sylvestris;    Betula pendula;    Fine root turnover;    Carbon;    Minirhizotron;   

DOI  :  10.1016/j.foreco.2013.01.022

来源: Elsevier

【 摘 要 】

Fine roots contribute to net primary production in forests, but knowledge of fine root longevity and turnover is still incomplete and limited to few tree species. In this study, we used minirhizotrons to compare fine root biomass, longevity and turnover of Pinus sylvestris L., Betula pendula Roth and Picea abies (L) Karst. in southern Sweden. Minirhizotron tubes were installed in 2006 and root images were taken in 2007-2010. Soil cores were used to estimate fine root biomass. Soil samples were taken from the humus layer and from 0 to 10 cm, 10 to 20 cm and 20 to 30 cm depth in the mineral soil. Only images from the humus layer and the upper 10 cm of mineral soil were included in root analysis. Spruce has a higher aboveground production than pine and birch in southern Sweden and this was reflected in larger fine root biomass as well as higher fine root biomass production. The annual tree fine root biomass production (humus and 0-30 cm in mineral soil) was 73, 78 and 284 g m(-2) in pine, birch and spruce stands, respectively. Thicker fine roots tended to live longer. The majority of the fine roots were thinner than 0.5 mm in diameter, with a turnover rate (KM) of 0.4 year(-1). When comparing all fine roots, i.e. all roots 0-2 mm, pine had the highest longevity, 1120 days, compared with 900 days for spruce and 922 days for birch (KM). (C) 2013 Elsevier B.V. All rights reserved.

【 授权许可】

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