A process-based growth model for the grass stage pine seedlings

Koskela, Jarkko

doi:10.14214/sf.640

Cited by 11 publications

(12 citation statements)

References 37 publications

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“…In fact, large trees can tolerate sustained drought periods extending over the entire growing season and even across multiple growing seasons , while such severe drought periods can lead to mortality of seedlings and saplings (for seedling physiological responses see Mendel et al, 1997;Mueller et al, 2005;Lopez and Kursar, 2007). The presence of large carbon reserves in mature plants can also allow for new shoot formation and resprouting (in resprouting species) following catastrophic events such as fire (Koskela, 2000;Langley et al, 2002) and breakage of branches or entire stem (Génard et al, 1998;Verdaguer and Ojeda, 2002;van Bloem et al, 2003;Wong et al, 2005;Vargas, 2009;Vargas et al, 2009). Thus, the availability of large reserves contributes to survival of and greater recovery after such devastating events.…”

Section: Effects Of Ontogeny On Stress Sensitivitymentioning

confidence: 99%

Responses of forest trees to single and multiple environmental stresses from seedlings to mature plants: Past stress history, stress interactions, tolerance and acclimation

Niinemets

2010

Forest Ecology and Management

636

467

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a b s t r a c tForest trees are exposed to a myriad of single and combined stresses with varying strength and duration throughout their lifetime, and many of the simultaneous and successive stress factors strongly interact. While much progress has been achieved in understanding the effects of single stresses on tree performance, multiple interacting stress effects cannot be adequately assessed from combination of single factor analyses. In particular, global change brings about novel combinations of severity and timing of different stresses, the effects of which on tree performance are currently hard to predict. Furthermore, the combinations of stresses commonly sustained by trees change during tree ontogeny. In addition, tree photosynthesis and growth rates decline with increasing tree age and size, while support biomass in roots, stem and branches accumulates and the concentrations of non-structural carbohydrates increase, collectively resulting in an enhancement of non-structural carbon pools. In this review, tree physiological responses to key environmental stress factors and their combinations are analyzed from seedlings to mature trees. The key conclusions of this analysis are that combined stresses can influence survival of large trees even more than chronic exposure to a single predictable stress such as drought. In addition, tree tolerance to many environmental stresses increases throughout the ontogeny as the result of accumulation of non-structural carbon pools, implying major change in sensing, response and acclimation to single and multiple stresses in trees of different size and age.

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Section: Effects Of Ontogeny On Stress Sensitivitymentioning

confidence: 99%

Responses of forest trees to single and multiple environmental stresses from seedlings to mature plants: Past stress history, stress interactions, tolerance and acclimation

Niinemets

2010

Forest Ecology and Management

636

467

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“…An earlier developed carbon-and nitrogen-balance model for the grass stage pine seedlings (Koskela 2000a), applying pipe model theory and a modi®cation of functional balance as growth-guiding rules, was used for simulations of growth. The model is based on material¯ows between a tree and its environment, and within a tree (e.g.…”

Section: Modelling Biomass Growthmentioning

confidence: 99%

“…The growth model explained reasonably well the variation in biomass and height growth of the grass stage seedlings under present climate (Figs 6 and 7). The model performance has earlier been analysed in a growth chamber experiment (Koskela 2000a) in which it was found that a linear relationship between height and needle mass may not yield a satisfactory ®t to measured height development. Therefore, this relationship was modelled in the present study using the exponential growth function, which seem to link height and needle mass development better than the linear relationship during the grass stage.…”

Section: Measured and Simulated Growthmentioning

confidence: 99%

“…In the earlier related study (Koskela 2000a), stem biomass was also modelled in a different way from this study, i.e. stem form coef®cient (f) was kept constant in the short-term growth chamber experiment.…”

Section: Measured and Simulated Growthmentioning

confidence: 99%

“…where n i are organ-speci®c N requirements in structural growth. For more detailed description of the growth model, see Koskela (2000a).…”

Section: Measured and Simulated Growthmentioning

confidence: 99%

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Responses of gas exchange and growth in Merkus pine seedlings to expected climatic changes in Thailand

Koskela¹

2001

Global Change Biology

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Responses of gas exchange and growth in Merkus pine (Pinus merkusii Jungh. et de Vriese) seedlings to changing climate were analysed for high‐ and low‐altitude sites in Thailand. A gas exchange model, based on the optimality approach, derived the effect of drought from the probability of rains. A carbon‐and nitrogen‐balance growth model applied structural regularities of a tree and a modification of functional balance between foliage and fine roots as growth‐ guiding rules. Adaptation to local climates was incorporated in the models. The simulations yielded physiologically reasonable behaviour for annual photosynthesis (A) and transpiration (E) in relation to the distributions of precipitation over the course of a year. An annual temperature increase of 2 °C and a prolonged dry season (scenario 2) reduced A by 5–11% and E by 5–8% as compared to present climate (scenario 1). Doubled CO2 concentration and the increased temperature (scenario 3) enhanced A by 56–59% and E by 14%. Simultaneously these changes (scenario 4) increased A by 41–53% and E by 1–5%. Simulated growth in scenario 1 fitted reasonably well to field data. By the age of five years, simulated total biomass (TB) and height (h) were reduced by 31–67% and 12–42%, respectively, in scenario 2 compared to scenario 1. In scenario 3, TB and h increased by 279–330% and 94–191%, and in scenario 4, by 83–241% and 55–69%, respectively. Large increases in TB and h are explained by the exponential growth phase of the young seedlings. These results suggest that climatic changes enhance growth and thus shorten the duration of the grass stage in these seedlings. However, the effects of climatic changes on growth depend strongly on how rainfall seasonality is altered in SE Asia because prolonged drought episodes may retard the fertilizing effects of the increasing CO2 concentration.

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Linking local to global properties in branching modular networks: gorgonian coral colonies

et al. 2010

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A process-based growth model for the grass stage pine seedlings

Cited by 11 publications

References 37 publications

Responses of forest trees to single and multiple environmental stresses from seedlings to mature plants: Past stress history, stress interactions, tolerance and acclimation

Responses of forest trees to single and multiple environmental stresses from seedlings to mature plants: Past stress history, stress interactions, tolerance and acclimation

Responses of gas exchange and growth in Merkus pine seedlings to expected climatic changes in Thailand

Linking local to global properties in branching modular networks: gorgonian coral colonies

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