The role of phosphorus availability: has nitrogen deposition pushed the upland ecosystem to the limit?

Allbwn ymchwil: Pennod mewn Llyfr/Adroddiad/Trafodion CynhadleddTrafodion Cynhadledd (Nid-Cyfnodolyn fathau)

Crynodeb

Reactive nitrogen (N) deposition can significantly affect ecosystem processes, particularly in the oligotrophic upland ecosystem. Phosphorus (P) limitation may significantly constrain ecosystem productivity, yet ecosystem responses to P availability in instances of high N deposition are poorly understood. The release from P limitation can increase vegetation biomass production, enabling ecosystems to sequester greater reactive N inputs. We hypothesised that this increased biomass production would positively influence ecosystem carbon (C) storage potential. We observed interactions between vegetation species composition, soil nutrient pools, soil microbial activity, soil respiration (CO2 and CH4 flux) and soil C storage potential in response to N and P availability (to alleviate the potential limitation), using both short term (1 year) and long term (1996 - 2012) nutrient addition experiments. Exposure to nutrient enrichment was responsible for significant changes in the structure and composition of vegetation species, above-ground vegetation biomass and vegetation diversity. Shifts in vegetation species coverage had strong cascading effects on nutrient cycling rates, with significant reductions observed in soil C and N pool sizes, particularly after long term exposure, suggesting P limitation may have a larger than expected effect on below-ground ecosystem processes. Soil respiration response was variable between CO2 and CH4, but with higher emissions of C with nutrient addition, particularly where N and P were added in combination, both in the short and long term. This study demonstrated the significant effect of P availability on upland ecosystem processes and highlights the long term effect of P addition on vegetation species composition and therefore the long term influence on ecosystem function and C storage; which is essential information for management strategies considering P addition as a method to negate the effects of chronic N enrichment from deposition.
Iaith wreiddiolSaesneg
TeitlBES Annual Meeting 13–16 December 2015 EICC, Edinburgh, Scotland
Nifer y tudalennau1
StatwsCyhoeddwyd - 14 Rhag 2015
DigwyddiadBritish Ecological Society annual meeting - Edinburgh International Conference Centre, Edinburgh, Teyrnas Unedig Prydain Fawr a Gogledd Iwerddon
Hyd: 13 Rhag 201517 Rhag 2015

Cynhadledd

CynhadleddBritish Ecological Society annual meeting
Gwlad/TiriogaethTeyrnas Unedig Prydain Fawr a Gogledd Iwerddon
DinasEdinburgh
Cyfnod13 Rhag 201517 Rhag 2015

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