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-PGday), 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-PGday 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. © 2013 INRA and Springer-Verlag France.

Assessing temporal variation of primary and ecosystem production in two Mediterranean forests using a modified 3-PG model / Nolè, A.; Collalti, A.; Magnani, F.; Duce, P.; Ferrara, A.; Mancino, G.; Marras, Serena; Sirca, Costantino Battista; Spano, Donatella Emma Ignazia; Borghetti, M.. - In: ANNALS OF FOREST SCIENCE. - ISSN 1286-4560. - 70:7(2013), pp. 729-741. [10.1007/s13595-013-0315-7]

Assessing temporal variation of primary and ecosystem production in two Mediterranean forests using a modified 3-PG model

MARRAS, Serena;SIRCA, Costantino Battista;SPANO, Donatella Emma Ignazia;
2013-01-01

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-PGday), 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-PGday 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. © 2013 INRA and Springer-Verlag France.
Assessing temporal variation of primary and ecosystem production in two Mediterranean forests using a modified 3-PG model / Nolè, A.; Collalti, A.; Magnani, F.; Duce, P.; Ferrara, A.; Mancino, G.; Marras, Serena; Sirca, Costantino Battista; Spano, Donatella Emma Ignazia; Borghetti, M.. - In: ANNALS OF FOREST SCIENCE. - ISSN 1286-4560. - 70:7(2013), pp. 729-741. [10.1007/s13595-013-0315-7]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11388/162650
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