Distinct patterns of below- and aboveground growth phenology and litter carbon inputs along a boreal site type gradient

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http://hdl.handle.net/10138/328273

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Ding , Y , Leppälammi-Kujansuu , J , Salemaa , M , Schiestl-Aalto , P , Kulmala , L , Ukonmaanaho , L , Nöjd , P , Minkkinen , K , Makita , N , Zeleznik , P , Merila , P & Helmisaari , H-S 2021 , ' Distinct patterns of below- and aboveground growth phenology and litter carbon inputs along a boreal site type gradient ' , Forest Ecology and Management , vol. 489 , 119081 . https://doi.org/10.1016/j.foreco.2021.119081

Title: Distinct patterns of below- and aboveground growth phenology and litter carbon inputs along a boreal site type gradient
Author: Ding, Yiyang; Leppälammi-Kujansuu, Jaana; Salemaa, Maija; Schiestl-Aalto, Pauliina; Kulmala, Liisa; Ukonmaanaho, Liisa; Nöjd, Pekka; Minkkinen, Kari; Makita, Naoki; Zeleznik, Peter; Merila, Paivi; Helmisaari, Heljä-Sisko
Contributor: University of Helsinki, Department of Forest Sciences
University of Helsinki, Department of Forest Sciences
University of Helsinki, Ecosystem processes (INAR Forest Sciences)
University of Helsinki, Department of Forest Sciences
University of Helsinki, Department of Forest Sciences
University of Helsinki, Department of Forest Sciences
Date: 2021-06-01
Number of pages: 11
Belongs to series: Forest Ecology and Management
ISSN: 0378-1127
URI: http://hdl.handle.net/10138/328273
Abstract: Forest ecosystem productivity is strongly linked to site nutrient availability, which is influenced by litter inputs and their decomposition rates. Fine roots and mycelia are key contributors in belowground soil carbon (C) accumulation, but studies have seldom reported how belowground litter C input is related to site types in boreal forests. In this study, three mature and one young Pinus sylvestris forests along a site type gradient in southern Finland were chosen for measurements of fine root biomass, fine root longevity, below- and aboveground growth phenology and annual litter input from tree and understorey vegetation. Site types were distinguished by understorey vegetation composition, which indicated the site fertility. Fine root biomass per tree stand basal area decreased significantly from nutrient-poor to nutrient-rich sites, the nutrient-poor sites with longer fine root longevity resulted in an equal belowground litter input with the nutrient-rich site. Above- and belowground annual litter inputs were 131–236 and 70–91 g m−2 year−1, respectively. Aboveground litter increased with site fertility, resulting into belowground litter having a decreasing trend from 37% to 23% of total litter inputs with increasing site fertility. Ectomycorrhizal mycelia and understory production contributed 8–13% and 18–41% of belowground production, respectively. Contribution of understorey vegetation to the belowground litter C input was lower than that of trees at xeric and sub-xeric sites but equaled to that of trees at the mesic site. Our study showed distinct dimensions of below- and aboveground litter inputs influenced by site types. Moreover, we emphasize that the belowground C inputs from ectomycorrhizal mycelia and the understorey in addition to those of trees should always be considered in C balances and C reporting in boreal conifers.
Subject: 4112 Forestry
Fine root turnover
Carbon cycle
Site type
Growth phenology
Carbon allocation
Ectomycorrhizal mycelia
Fine root longevity
Minirhizotron
Pinus sylvestris
Soil fertility
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