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- Title
Assessing temporal variation of primary and ecosystem production in two Mediterranean forests using a modified 3-PG model.
- Authors
Nolè, Angelo; Collalti, Alessio; Magnani, Federico; Duce, Pierpaolo; Ferrara, Agostino; Mancino, Giuseppe; Marras, Serena; Sirca, Costantino; Spano, Donatella; Borghetti, Marco
- Abstract
Context: Forest ecosystem carbon uptake is heavily affected by increasing drought in the Mediterranean region. Aims: The objectives of this study were to assess the capacity of a modified 3-PG model to capture temporal variation in gross primary productivity (GPP), and ecosystem net carbon uptake (NEE) in two Mediterranean forest types. Methods: The model was upgraded from a monthly (3-PG) to a daily time step (3-PG), and a soil water balance routine was included to better represent soil water availability. The model was evaluated against seasonal GPP and NEE dynamics from eddy covariance measurements. Results: Simulated and measured soil water content values were congruent throughout the study period for both forest types. 3-PG effectively described the following: GPP and NEE seasonal patterns; the transition of forest ecosystems from carbon sink to carbon source; however, the model overestimated diurnal ecosystem respiration values and failed to predict ecosystem respiration peaks. Conclusions: The model served as a rather effective tool to represent seasonal variation in gross primary productivity, and ecosystem net carbon uptake under Mediterranean drought-prone conditions. However, its semi-empirical nature and the simplicity inherent in the original model formulation are obstacles preventing the model working well for short-term daily predictions.
- Subjects
MEDITERRANEAN Region; FOREST ecology; DROUGHTS; PRIMARY productivity (Biology); FOREST productivity; SOIL moisture
- Publication
Annals of Forest Science (BioMed Central), 2013, Vol 70, Issue 7, p729
- ISSN
1286-4560
- Publication type
Article
- DOI
10.1007/s13595-013-0315-7