期刊论文详细信息
FOREST ECOLOGY AND MANAGEMENT 卷:326
Fine root longevity and carbon input into soil from below- and aboveground litter in climatically contrasting forests
Article
Leppalammi-Kujansuu, Jaana1  Aro, Lasse2  Salemaa, Maija3  Hansson, Karna4  Kleja, Dan Berggren5  Helmisaari, Helja-Sisko1 
[1] Univ Helsinki, Dept Forest Sci, FI-00014 Helsinki, Finland
[2] Finnish Forest Res Inst, FI-39700 Parkano, Finland
[3] Finnish Forest Res Inst, FI-01301 Vantaa, Finland
[4] Ctr INRA Nancy, Unite Biogeochim Ecosyst Forestiers UR 1138, F-54280 Seichamps, France
[5] Swedish Univ Agr Sci, Dept Soil & Environm, SE-75007 Uppsala, Sweden
关键词: Fine root biomass and turnover;    Litter production;    Carbon flow;    Picea abies;    Understorey;    Minirhizotrons;   
DOI  :  10.1016/j.foreco.2014.03.039
来源: Elsevier
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【 摘 要 】

The major part of carbon (C) flow into forest soil consists of continually renewed fine roots and aboveground litterfall. We studied the belowground C input from the fine root litter of trees and understorey vegetation in relation to their aboveground litterfall in two Norway spruce (Picea abies L) stands located in northern and southern Finland. The production of fine roots was estimated by using turnover and biomass data from minirhizotrons and soil cores. The foliage litter production of trees was estimated from litter traps, and that of the understorey vegetation from its annual growth and coverage. Finally, we augmented the data with four spruce plots in Sweden in order to study the above- and belowground litter ratios along latitudinal and soil fertility gradients. The fine root biomass of spruce trees per stand basal area was almost double in the northern site compared to the southern site. Furthermore, spruce fine roots in the north persisted significantly longer (97 +/- 2 weeks) than spruce roots in the south (89 +/- 2 weeks) or understorey fine roots at both sites. The annual production of tree foliage litter was higher in the southern stand, but the total amount of litter (including trees and understorey, above- and belowground) was similar at both sites, as was the ratio between the above- and belowground litter production. The role of understorey vegetation was greater in the northern site where it was responsible for 23% and 33% of below- and aboveground litter production, respectively, compared to 11% and 15% in the south. Thus, both below- and aboveground understorey C input is substantial and should be taken into account in ecosystem C cycle models. The regression between the aboveground:belowground litter production-ratio and the C:N-ratio of the organic layer (combined data from Finland and Sweden), showed that the share of belowground litter production increased when site fertility decreased. This shift in the litter production pattern from above-to belowground in the least fertile sites may have an impact on litter C quality and soil C storage. (C) 2014 The Authors. Published by Elsevier B.V.

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