Sapling growth and survivorship as a function of light in a mesic forest of southeast Texas, USA

Lin, Ji; Harcombe, P. A.; Fulton, Mark R.; Hall, Rosine W.

doi:10.1007/s00442-002-0986-5

Cited by 50 publications

(68 citation statements)

References 48 publications

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“…(1) following Drever and Lertzman (2001) and Lin et al (2002) the Michaelis-Menten function was applied in the case of relative PAR and (2) the Mitscherlich function was applied in all other factors, i.e. SW, IRI and ICI.…”

Section: Data Evaluationmentioning

confidence: 99%

Evaluation of different approaches for modelling individual tree seedling height growth

Wagner¹,

Madsen

Ammer

2009

Trees

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We compared different approaches for modelling height growth of individual beech seedlings in a controlled factorial experiment as well as in field data from naturally regenerated beech seedlings under the canopy of overstorey mature beech trees. Several competition indices, a model of overstorey fine root density, relative photosynthetically active radiation (PAR) values, and soil water values were used in these approaches. In the factorial experiment relative PAR and soil water content were measured and used for the prediction of seedlings height growth. In the field experiment this was done by using relative PAR and estimated fine root biomass as a surrogate for below ground resource availability. The latter approach was compared with a model where we used various competition indices representing the impact of overstorey trees on beech seedlings. Our results suggested that (1) models which combine resource based growth functions are suitable for the prediction of individual height growth of beech seedlings. Resource based models offer the opportunity to investigate on the independent multiplicative effect of irradiance and water supply and their interactions on tree seedlings. It was (2) shown that a combined model could be used not only to predict individual height growth of beech seedlings in a controlled experiment but also in the field. The model parameters of a pure light response function for the controlled factorial experiment are comparable to those obtained in the field study. The results showed (3) that the precision of predicting beech seedlings height growth is comparable between the model types tested within this study. Approximately half of the observed variation in seedlings relative height growth rate could be explained. However, the simple competition index approach provides no information on the environmental factors constraining tree seedlings growth; whereas the multiplicative combined models can be used to get a better understanding of growth dynamics in the field.

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Section: Data Evaluationmentioning

confidence: 99%

Evaluation of different approaches for modelling individual tree seedling height growth

Wagner¹,

Madsen

Ammer

2009

Trees

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“…Because M A changes faster in shade-intolerant species, RGR is also likely to change faster, leading to RGR rank changes among woody species of contrasting shade tolerance (Sack & Grubb 2001. Few studies have investigated the growth rates of established saplings (Pacala et al 1994;DeLucia et al 1998;Niinemets 1998;Lin et al 2002), and even fewer studies have investigated both the above-and below-ground plant biomass pools (DeLucia et al 1998;Niinemets 1998;Claveau et al 2005). Nevertheless, the growth rate vs. long-term irradiance response curves developed simultaneously for seven to ten species of contrasting shade tolerance, demonstrate an overall positive correlation between plant growth potential in low light and species shade tolerance rank with only a few exceptions (Pacala et al 1994;Lin et al 2002).…”

Section: Complex Interactions Between Seed Size and Relative Vs Absomentioning

confidence: 99%

The controversy over traits conferring shade‐tolerance in trees: ontogenetic changes revisited

2006

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Summary1 Successional replacement of intolerant species by shade tolerators along gapunderstorey gradients is commonly associated with increasingly higher low-light carbon acquisition capacities of more tolerant species. This doctrine has recently been challenged because of evidence demonstrating larger leaf dry mass per unit area ( M A ), lower photosynthetic capacities and inferior whole plant relative growth rates (RGR) in both high and low irradiance in seedlings of shade-tolerators. However, as the individuals of shade-tolerant species often need to endure canopy shade for many years before gap formation, testing of the carbon gain hypothesis of shade tolerance requires examination of species carbon gain potentials during the entire plant ontogeny. 2 Light vs. M A relationships throughout ontogeny demonstrate that saplings and canopy individuals of shade tolerators do have lower M A than intolerant species, and moderately higher photosynthetic capacities in low light, resulting in greater whole plant carbon gain capacities at lower light. The apparent discrepancy between results from studies on seedlings vs. saplings/trees is due to M A increasing at a faster rate in shade intolerators during ontogeny. A strong positive linkage between seed size and species shade tolerance further implies that shade tolerators have larger initial size, absolute growth rate and survivorship in low light despite their lower RGR. 3 The evidence reviewed collectively suggests that the carbon balance concept of species' successional position is valid for both seedlings and saplings, and that the apparent discrepancies in species rankings on the basis of structural and physiological characteristics are driven by variations in initial size and rate of ontogeny. Analyses of species shade tolerance potentials should therefore consider how any suite of adaptive traits varies with ontogeny.

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“…Pacala et al (1994Pacala et al ( , 1996 challenged the traditional paradigm of shade tolerance by proposing that a tradeoff between growth in high light and survivorship in low light is more important than a generally believed high-light growth vs low-light growth tradeoff (see Lin et al 2002 and references therein). Our results in a mesic forest suggested that it may not be appropriate to think of these two tradeoffs as one opposed to another and that the importance of growth and survivorship as components of shade tolerance may be system-specific (Lin et al 2002).…”

Section: Introductionmentioning

confidence: 97%

Sapling growth and survivorship as affected by light and flooding in a river floodplain forest of southeast Texas

et al. 2004

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We investigated the effects of light and flooding on growth and survivorship of saplings in a river floodplain forest of southeast Texas. Growth responses to light were consistent with the expectation that shade-intolerant species grow faster than shade-tolerant species in high light, and vice versa. Mortality risk was not associated with shade tolerance level unless high mortality risks associated with a period of high flooding were removed. These results support the hypothesis that shade-tolerant species in floodplains may be limited by flooding as previous studies suggested. Also, compared to their performance at a nearby mesic site, common species showed little intraspecific difference in shade tolerance, especially for shade-intolerant species. Finally, the positive correlation between low-light growth and survivorship suggests that carbon allocation to continued growth may be favored as a sapling strategy in floodplains.

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Sapling growth and survivorship as a function of light in a mesic forest of southeast Texas, USA

Cited by 50 publications

References 48 publications

Evaluation of different approaches for modelling individual tree seedling height growth

Evaluation of different approaches for modelling individual tree seedling height growth

The controversy over traits conferring shade‐tolerance in trees: ontogenetic changes revisited

Sapling growth and survivorship as affected by light and flooding in a river floodplain forest of southeast Texas

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