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Title: Annual climate variation modifies nitrogen induced carbon accumulation of Pinus sylvestris forests

Journal Article · · Ecological Applications
DOI:https://doi.org/10.1002/eap.1571· OSTI ID:1533157
 [1];  [2];  [3];  [1];  [1];  [3];  [1];  [1]
  1. Swedish University of Agricultural Sciences (SLU), Umeå (Sweden)
  2. Nagoya Univ. (Japan); Duke Univ., Durham, NC (United States)
  3. Southern Swedish Forest Research Centre (Sweden)

Abstract We report results from long‐term simulated external nitrogen (N) input experiments in three northern Pinus sylvestris forests, 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 wood NPP to 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 wood NPP and the N response efficiency ( RE N , increase in wood NPP per external N input) were maximized at an external N input of ~3 g N·m −2 ·yr −1 , regardless of site productivity. The maximum RE N was greater in the higher productivity than the lower productivity stand (~20 vs. ~14 g C/g N). The N‐induced enhancement of wood NPP and its RE N were, however, markedly contingent on climatic variables. In both of the higher and lower productivity stands, wood NPP increased with growing season precipitation ( P ), but only up to ~400 mm. The sensitivity of the response to P increased with increasing external N inputs. Increasing growing season temperature ( T ) somewhat increased the N‐induced drought effect, whereas decreasing T reduced the drought effect. These responses of wood NPP infused a large temporal variation to RE N , 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 boreal P. sylvestris , and possibly other forests.

Research Organization:
Duke Univ., Durham, NC (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER)
Grant/Contract Number:
SC0006967; DE‐SC0006967
OSTI ID:
1533157
Alternate ID(s):
OSTI ID: 1378292
Journal Information:
Ecological Applications, Vol. 27, Issue 6; ISSN 1051-0761
Publisher:
Ecological Society of AmericaCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 12 works
Citation information provided by
Web of Science

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