Fine root turnover and litter production of Norway spruce in a long-term temperature and nutrient manipulation experiment

Jaana Leppälammi-Kujansuu, Maija Salemaa, Dan Berggren Kleja, Sune Linder, Heljä-Sisko Helmisaari

Forskningsoutput: TidskriftsbidragArtikelVetenskapligPeer review


Background and aims: Increased soil temperature and nutrient availability enhance soil biological activity. We studied how these affect fine root growth and
survival, i.e. below-ground litter production, in relation to above-ground foliage litter production of Norway spruce (Picea abies (L.) Karst.).
Methods: The treatments, irrigation (I), soil warming +irrigation (WI), fertilization + irrigation (FI) and soil warming + fertilization + irrigation (WFI) were started
in 1987 (F, I) and in 1995 (W). The annual production of fine root litter was estimated from minirhizotrons (survival) and soil-cores (biomass) and the annual
above-ground litter production from litter traps.
Results and conclusions: The number and elongation of fine roots tended to be higher in WI and I compared to the other treatments, which may indicate nutrient
shortage. Fine roots in the WFI treatment had the lowest median longevity and from three to fourfold higher below-ground litter production compared to
WI, FI or I - higher soil temperature increased the litter input particularly into the mineral soil. Only fertilization increased the above-ground litter production. As
warmer and more nutrient-rich soil significantly shortened the fine root lifespan and increased the litter input, the storage of carbon in boreal forest soil may increase in the future.
TidskriftPlant and Soil
Sidor (från-till)73-88
StatusPublicerad - jan 2014
MoE-publikationstypA1 Tidskriftsartikel-refererad


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