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Subramanian, Narayanan, 2010. Simulation of Net Primary Production (NPP) of Picea abies in southern Sweden : an analysis based on three forest growth models. Second cycle, A2E. Alnarp: SLU, Southern Swedish Forest Research Centre



The potential Net Primary Production (NPP) under climate change was simulated by using two
process based growth models, 3-PG and BIOMASS. Both models were run for two climate
scenarios A2 and B2 during the period 2071-2100 and compared with simulations of reference
climate (1961-1990). The simulated NPP of the 3-PG model was also compared with simulated
output of NPP from the BIOMASS model, for Picea abies (Norway spruce) at Asa in southern
Sweden. In addition, the simulation results from 3-PG were compared with the biomass
production of the empirical growth model DT. Special objectives of this study were (i) to
estimate 3-PG parameters for Picea abies, (ii) compare the simulated NPP under different
climate scenarios A2 and B2, (iii) analyze the 3-PG model sensitivity towards change in
temperature, rainfall and soil fertility and (iv) to compare the prediction of potential NPP
between 3-PG and BIOMASS models. Climate data showed an increased precipitation during
winter season and elevated temperature throughout the whole year. The development of dry
mass (tones/ha) simulated through 3-PG had good correlation with values simulated through
DT. The R2 value for foliage dry mass, root dry mass, stem dry mass and total dry mass are
0.82, 0.94, 0.7 and 0.73 respectively. The relative increase in predicted NPP ranged between
26.8-48.4% and 55.5-101.6% for A2 and B2 scenarios, respectively. A sensitivity analysis was
also conducted for the effect of rainfall, temperature and soil fertility on potential NPP
simulated by the 3-PG model. The relative range of NPP under A2-scenario was 55.5-101.6%
for the 3-PG model and 13.3-41.8 for the BIOMASS model. The corresponding value for the
B2-scenario was 26.8-48.4 % for 3-PG and 10.7-29.7 for BIOMASS.

Main title:Simulation of Net Primary Production (NPP) of Picea abies in southern Sweden
Subtitle:an analysis based on three forest growth models
Authors:Subramanian, Narayanan
Supervisor:Bergh, Johan and Nilsson, Urban
Examiner:Agestam, Eric
Series:Master thesis / SLU, Southern Swedish Forest Research Centre
Volume/Sequential designation:160
Year of Publication:2010
Level and depth descriptor:Second cycle, A2E
Student's programme affiliation:SM001 Euroforester - Master's Programme 120 HEC
Supervising department:(S) > Southern Swedish Forest Research Centre
Keywords:climate change, modeling, boreal, Elevated temperature increased CO2-concentrations
Permanent URL:
Subject. Use of subject categories until 2023-04-30.:Forestry production
Deposited On:17 Feb 2011 08:23
Metadata Last Modified:20 Apr 2012 14:17

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