Influence of greater Nitrogen Deposition in Missoula, MT Anne Trainor Exercise 3 October 2, 2007.

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Presentation transcript:

Influence of greater Nitrogen Deposition in Missoula, MT Anne Trainor Exercise 3 October 2, 2007

Introduction Substantial increase of nitrogen deposition since the industrial boom large impacts on forested ecosystems. Objective: Examine how a significant increase in nitrogen could influence annual and seasonal nutrient cycling dynamics within an evergreen forest.

Study System Missoula, MT Meteorological Data: m Loamy Soil 30% sandy, 50% silt, 20% clay Evergreen Needleleaf system Used all defaults

Modeling Biome-BGC (version 4.1.2) Carbon levels constant at default value ( ppm) Consisted of 3 runs for 88 years A) Spin up: Default pre-industrial nitrogen level ( kgm 2 yr 1 ) B) Typical Nitrogen: Based off previous Spinup ran simulation with default pre-industrial nitrogen level ( kgm 2 yr 1 ) C) Increased Nitrogen: Based off original Spinup ran simulation with Nitrogen increased to kgm 2 yr 1

Methods Selected a consecutive dry and wet year to compare extremes 1980 and and 1974

Relevant Variables Modeled Variables AnnualDaily Maximum LAILAI NPP GPPSoil carbon fluxes (SoilC 1-4) EvapotranspirationLitter stores (LitterC 1-4) Leaf water potential

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