Response of CO2 uptake, chlorophyll content, and some productional features of forest herb Smyrnium perfoliatum L. (Apiaceae) to different light conditions

Olah, R.; Masarovičová, E.

doi:10.1007/s11738-997-0004-y

Cited by 7 publications

(1 citation statement)

References 29 publications

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“…Elatostema repens , a tropical understorey herb, experienced photoinhibition and a reduction in carbon gain when exposed to irradiance greater than 700 μmol m −2 s −1 (Le Gouallec, Cornic & Blanc ). Intense and long‐lasting canopy disturbances could lead to high leaf temperature, increased water loss and eventual photoinhibition in obligate understorey herbs that do not possess physical avoidance mechanisms and physiological adaptations to high light (Chazdon & Pearcy ; Oláh & Masarovičová ; Fournier et al . ; Roberts & Gilliam ).…”

Section: Introductionmentioning

confidence: 99%

Demographic stimulation of the obligate understorey herb,Panax quinquefoliusL., in response to natural forest canopy disturbances

Chandler

McGraw

2016

Journal of Ecology

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1. Natural and anthropogenic forest canopy disturbances significantly alter forest dynamics and lead to multi-dimensional shifts in the forest understorey. An understorey plant's ability to exploit alterations to the light environment caused by canopy disturbance leads to changes in population dynamics. The purpose of this work was to determine if population growth of a species adapted to low light increases in response to additional light inputs caused by canopy disturbance, or alternatively, declines due to long-term selection under low light conditions. 2. To address this question, we quantified the demographic response of an understorey herb to three contrasting forest canopy disturbances (ice storms, tent caterpillar defoliation and lightning strikes) that encompass a broad range of disturbance severity. We used a model shade-adapted understorey species, Panax quinquefolius, to parameterize stage-based matrix models. Asymptotic growth rates, stochastic growth rates and simulations of transient dynamics were used to quantify the populationlevel response to canopy disturbance. Life table response experiments were used to partition the underlying controls over differences in population growth rates. 3. Population growth rates at all three disturbed sites increased in the transition period immediately after the canopy disturbance relative to the transition period prior to disturbance. Stochastic population models revealed that growth rates increased significantly in simulations that included disturbance matrices relative to those simulations that excluded disturbance. Additionally, transient models indicated that population size (n) was larger for all three populations when the respective disturbance matrix was included in the model. 4. Synthesis. Obligate shade species are most likely to be pre-adapted to take advantage of canopy gaps and light influx to a degree, and this pre-adaptation may be due to long-term selection under dynamic old growth forest canopies. We propose a model whereby population performance is represented by a parabolic curve where performance is maximized under intermediate levels of canopy disturbance. This study provides new evidence to aid our understanding of the population-level response of understorey herbs to disturbances whose frequency and intensity are predicted to increase as global climates continue to shift.

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Section: Introductionmentioning

confidence: 99%

Demographic stimulation of the obligate understorey herb,Panax quinquefoliusL., in response to natural forest canopy disturbances

Chandler

McGraw

2016

Journal of Ecology

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A slow opportunist: physiological and growth responses of an obligate understory plant to patch cut harvesting

Chandler

2017

Oecologia

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Understory light environments change rapidly following timber harvest, and while many understory species utilize and benefit from the additional light, this response is not ubiquitous in shade-obligate species. I examined the effects of patch cut timber harvest on the physiology and growth of an obligate forest understory species to determine if disturbances via timber harvest are physiological stressors or whether such disturbances provide physiological benefits and growth increases in understory species. Forest canopy structure, along with photosynthesis, respiration, water use efficiency, stomatal conductance, and growth rates of American ginseng were quantified one summer before and two summers after patch cut timber harvest. Survival following timber harvest was lower than that observed at undisturbed populations; however, growth of survivors increased post-harvesting, with growth increasing as a function of canopy openness. Light response curves as well as photosynthesis and respiration rates indicated that plants were not well acclimated to higher light levels in the growing season after timber harvest, but rather to two growing seasons after harvest. Relative growth rate formed a positive linear relationship with maximum photosynthesis following timber harvest. My study suggests that ginseng is a "slow opportunist", because while it benefits from sudden light increases, acclimation lags at least one growing season behind canopy changes. American ginseng is surprisingly resilient in the face of a discrete environmental shift and may benefit from forest management strategies that mimic the natural disturbance regimes common in mature forests throughout its range.

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Sunfleck limits the small-scale distribution of endangered Kingdonia uniflora in the natural habitat of subalpine forest proved by its photosynthesis

et al. 2016

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Response of CO2 uptake, chlorophyll content, and some productional features of forest herb Smyrnium perfoliatum L. (Apiaceae) to different light conditions

Cited by 7 publications

References 29 publications

Demographic stimulation of the obligate understorey herb,Panax quinquefoliusL., in response to natural forest canopy disturbances

Demographic stimulation of the obligate understorey herb,Panax quinquefoliusL., in response to natural forest canopy disturbances

A slow opportunist: physiological and growth responses of an obligate understory plant to patch cut harvesting

Sunfleck limits the small-scale distribution of endangered Kingdonia uniflora in the natural habitat of subalpine forest proved by its photosynthesis

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