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Annual climate variation modifies nitrogen induced carbon accumulation ofPinus sylvestrisforests
AbstractWe report results from long‐term simulated external nitrogen (N) input experiments in three northernPinus sylvestrisforests, two of moderately high and one of moderately low productivity, assessing effects on annual net primary production (NPP) of woody mass and its interannual variation in response to variability in weather conditions. A sigmoidal response of woodNPPto external N inputs was observed in the both higher and lower productivity stands, reaching a maximum of ~65% enhancement regardless of the native site productivity, saturating at an external N input of 4–5 g N·m−2·yr−1. The rate of increase in woodNPPand the N response efficiency (REN, increase in woodNPPper external N input) were maximized at an external N input of ~3 g N·m−2·yr−1, regardless of site productivity. The maximumRENwas greater in the higher productivity than the lower productivity stand (~20 vs. ~14 g C/g N). The N‐induced enhancement of woodNPPand itsRENwere, however, markedly contingent on climatic variables. In both of the higher and lower productivity stands, woodNPPincreased with growing season precipitation (P), but only up to ~400 mm. The sensitivity of the response toPincreased with increasing external N inputs. Increasing growing season temperature (T) somewhat increased the N‐induced drought effect, whereas decreasingTreduced the drought effect. These responses of woodNPPinfused a large temporal variation toREN, making the use of a fixed value unadvisable. Based on these results, we suggest that regional climate conditions and future climate scenarios should be considered when modeling carbon sequestration in response to N deposition in borealP. sylvestris, and possibly other forests.
Annual climate variation modifies nitrogen induced carbon accumulation ofPinus sylvestrisforests
AbstractWe report results from long‐term simulated external nitrogen (N) input experiments in three northernPinus sylvestrisforests, two of moderately high and one of moderately low productivity, assessing effects on annual net primary production (NPP) of woody mass and its interannual variation in response to variability in weather conditions. A sigmoidal response of woodNPPto external N inputs was observed in the both higher and lower productivity stands, reaching a maximum of ~65% enhancement regardless of the native site productivity, saturating at an external N input of 4–5 g N·m−2·yr−1. The rate of increase in woodNPPand the N response efficiency (REN, increase in woodNPPper external N input) were maximized at an external N input of ~3 g N·m−2·yr−1, regardless of site productivity. The maximumRENwas greater in the higher productivity than the lower productivity stand (~20 vs. ~14 g C/g N). The N‐induced enhancement of woodNPPand itsRENwere, however, markedly contingent on climatic variables. In both of the higher and lower productivity stands, woodNPPincreased with growing season precipitation (P), but only up to ~400 mm. The sensitivity of the response toPincreased with increasing external N inputs. Increasing growing season temperature (T) somewhat increased the N‐induced drought effect, whereas decreasingTreduced the drought effect. These responses of woodNPPinfused a large temporal variation toREN, making the use of a fixed value unadvisable. Based on these results, we suggest that regional climate conditions and future climate scenarios should be considered when modeling carbon sequestration in response to N deposition in borealP. sylvestris, and possibly other forests.
Annual climate variation modifies nitrogen induced carbon accumulation ofPinus sylvestrisforests
Ecological Applications
Lim, Hyungwoo (author) / Oren, Ram (author) / Linder, Sune (author) / From, Fredrik (author) / Nordin, Annika (author) / Fahlvik, Nils (author) / Lundmark, Tomas (author) / Näsholm, Torgny (author)
Ecological Applications ; 27 ; 1838-1851
2017-09-01
Article (Journal)
Electronic Resource
English