Estimating fine-root production by tree species and understorey functional groups in two contrasting peatland forests

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http://hdl.handle.net/10138/184880

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Bhuiyan , M R , Minkkinen , K , Helmisaari , H-S , Ojanen , P , Penttila , T & Laiho , R 2017 , ' Estimating fine-root production by tree species and understorey functional groups in two contrasting peatland forests ' , Plant and Soil , vol. 412 , no. 1-2 , pp. 299-316 . https://doi.org/10.1007/s11104-016-3070-3

Title: Estimating fine-root production by tree species and understorey functional groups in two contrasting peatland forests
Author: Bhuiyan, Md Rabbil; Minkkinen, Kari; Helmisaari, Helja-Sisko; Ojanen, Paavo; Penttila, Timo; Laiho, Raija
Other contributor: University of Helsinki, Department of Forest Sciences
University of Helsinki, Department of Forest Sciences
University of Helsinki, Department of Forest Sciences
University of Helsinki, Forest Ecology and Management




Date: 2017-03
Language: eng
Number of pages: 18
Belongs to series: Plant and Soil
ISSN: 0032-079X
DOI: https://doi.org/10.1007/s11104-016-3070-3
URI: http://hdl.handle.net/10138/184880
Abstract: Background and aims Estimation of root-mediated carbon fluxes in forested peatlands is needed for understanding ecosystem functioning and supporting greenhouse gas inventories. Here, we aim to determine the optimal methodology for utilizing ingrowth cores in estimating annual fine-root production (FRP) and its vertical distribution in trees, shrubs and herbs. Methods We used 3-year data obtained with modified ingrowth core method and tested two calculation methods: 'ingrowth-dividing' and `ingrowth-subtracting'. Results The ingrowth-dividing method combined with a 2-year incubation of ingrowth cores can be used for the 'best estimate' of FRP. The FRP in the nutrient-rich fen forest (561 g m(-2)) was more than twice that in the nutrient-poor bog forest (244 g m(-2)). Most FRP occurred in the top 20-cm layer (76-82 %). Tree FRP accounted for 71 % of total FRP in the bog and 94 % in the fen forests, respectively, following the aboveground vegetation patterns; however, in fen forest the proportions of spruce and birch in FRP were higher than their proportions in stand basal area. Conclusions Our methodology may be used to study peatland FRP patterns more widely and will reduce the volume of labour-intensive work, but will benefit from verification with other methods, as is the case in all in situ FRP studies.
Subject: Fine roots
Fine-root production methods
Ingrowth core
Ingrowth core incubationtime
Peatlands
WATER-LEVEL DRAWDOWN
INGROWTH-CORE METHOD
NORWAY SPRUCE
BOREAL PEATLANDS
ORGANIC-MATTER
SCOTS PINE
NUTRIENT CONTENTS
SOUTHERN FINLAND
TURNOVER RATES
BIOMASS
4112 Forestry
1172 Environmental sciences
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