California black oak response to nitrogen amendment at a high O 3 , nitrogen-saturated site

Grulke, Nancy; Dobrowolski, W.; Mingus, P.; Fenn, Mark E.

doi:10.1016/j.envpol.2005.01.039

Cited by 18 publications

(5 citation statements)

References 20 publications

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“…Stomatal response of Helianthus annuus to changing light intensities during O 3 exposure was 13–15 min slower than for control plants (Younglove et al ., 1988). Sluggish stomatal responses to changes in light during or after O 3 exposure have continued to be reported by numerous authors across a range of species ( P. abies , Keller & Häsler, 1987; Wieser & Havranek, 1993; Pinus ponderosa , Grulke & Preisler, 2002; Quercus kellogii , Grulke et al ., 2005; Arbutus unedo , Paoletti, 2005). Our research describes physiological aberrations in stomatal functioning for plants of differing O 3 sensitivity type under low ambient O 3 exposures in the field.…”

Section: Discussionmentioning

confidence: 66%

Stomatal behavior of ozone‐sensitive and ‐insensitive coneflowers (Rudbeckia laciniata var. digitata) in Great Smoky Mountains National Park

et al. 2006

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Summary• Morphological and physiological attributes were assessed to elucidate the underlying mechanisms of ozone (O 3 ) sensitivity in a highly sensitive species, cutleaf coneflower ( Rudbeckia laciniata var. digitata ).• Foliage at the same height in the canopy on paired O 3 -sensitive and -insensitive cutleaf coneflowers was assessed for level of foliar symptoms, stomatal density, stomatal responsiveness to dynamic changes in light and leaf-to-air vapor pressure deficit (VPD), steady-state responses to light and CO 2 , intrinsic transpirational efficiency, and plant water balance.• There were no morphological differences between the sensitivity types that might have contributed to greater O 3 uptake in sensitive individuals. Stomata of sensitive plants were less responsive than those of insensitive plants to experimentally increased and decreased light intensities, and to increased VPD. O 3 -insensitive plants had greater intrinsic transpirational efficiencies, greater maximum assimilation rates under saturating CO 2 and light, and greater carboxylation rates.• Different physiological attributes vary independently within an individual plant, which collectively confer sensitivity or insensitivity to O 3 injury.

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Section: Discussionmentioning

confidence: 66%

Stomatal behavior of ozone‐sensitive and ‐insensitive coneflowers (Rudbeckia laciniata var. digitata) in Great Smoky Mountains National Park

et al. 2006

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“…Sluggish stomatal behaviour (Paoletti & Grulke ) has been demonstrated in a number of species (field study: California black oak , Grulke et al . ; chamber exposure studies: Handley & Grulke ; blue oak, Grulke et al . ; sensitive and tolerant common bean, Paoletti & Grulke ; Palmer amaranth, Amaranthus palmeri S. Watson, Paudel et al .…”

Section: Organismal Effects Cascade To Community and Ecological Procementioning

confidence: 99%

Ozone effects on plants in natural ecosystems

2019

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Tropospheric ozone (O 3 ) is an important stressor in natural ecosystems, with welldocumented impacts on soils, biota and ecological processes. The effects of O 3 on individual plants and processes scale up through the ecosystem through effects on carbon, nutrient and hydrologic dynamics. Ozone effects on individual species and their associated microflora and fauna cascade through the ecosystem to the landscape level. Systematic injury surveys demonstrate that foliar injury occurs on sensitive species throughout the globe. However, deleterious impacts on plant carbon, water and nutrient balance can also occur without visible injury. Because sensitivity to O 3 may follow coarse physiognomic plant classes (in general, herbaceous crops are more sensitive than deciduous woody plants, grasses and conifers), the task still remains to use stomatal O 3 uptake to assess class and species' sensitivity. Investigations of the radial growth of mature trees, in combination with data from many controlled studies with seedlings, suggest that ambient O 3 reduces growth of mature trees in some locations. Models based on tree physiology and forest stand dynamics suggest that modest effects of O 3 on growth may accumulate over time, other stresses (prolonged drought, excess nitrogen deposition) may exacerbate the direct effects of O 3 on tree growth, and competitive interactions among species may be altered. Ozone exposure over decades may be altering the species composition of forests currently, and as fossil fuel combustion products generate more O 3 than deteriorates in the atmosphere, into the future as well.

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“…Stomatal closure may be considered a means to down-regulate N influx. However, this down-regulation takes place at the expense of reduced carbon dioxide (CO2) influx into the leaves, resulting in reduced photosynthetic carbon fixation and hence growth [53]. When the stomatal opening is maintained in the presence of biologically available atmospheric N, this will result in uncontrolled, compulsory N nutrition via the leaves.…”

Section: Distribution and Fluxes Of Nitrogen In Forests Exposed To Himentioning

confidence: 99%

Nitrogen Nutrition of Trees in Temperate Forests—The Significance of Nitrogen Availability in the Pedosphere and Atmosphere

Rennenberg

Dannenmann

2015

Forests

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Nitrogen (N) is an essential nutrient that is highly abundant as N2 in the atmosphere and also as various mineral and organic forms in soils. However, soil N bioavailability often limits the net primary productivity of unperturbed temperate forests with low atmospheric N input. This is because most soil N is part of polymeric organic matter, which requires microbial depolymerization and mineralization to render bioavailable N forms such as monomeric organic or mineral N. Despite this N limitation, many unfertilized forest ecosystems on marginal soil show relatively high productivity and N uptake comparable to agricultural systems. The present review article addresses the question of how this high N demand is met in temperate forest ecosystems. For this purpose, current knowledge on the distribution and fluxes of N in marginal forest soil and the regulation of N acquisition and distribution in trees are summarized. The related processes and fluxes under N limitation are compared with those of forests exposed to high N loads, where chronic atmospheric N deposition has relieved N limitation and caused N saturation. We conclude that soil microbial biomass is of decisive importance for nutrient retention and provision to trees both in high and low N ecosystems. OPEN ACCESSForests 2015, 6 2821

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California black oak response to nitrogen amendment at a high O 3 , nitrogen-saturated site

Cited by 18 publications

References 20 publications

Stomatal behavior of ozone‐sensitive and ‐insensitive coneflowers (Rudbeckia laciniata var. digitata) in Great Smoky Mountains National Park

Stomatal behavior of ozone‐sensitive and ‐insensitive coneflowers (Rudbeckia laciniata var. digitata) in Great Smoky Mountains National Park

Ozone effects on plants in natural ecosystems

Nitrogen Nutrition of Trees in Temperate Forests—The Significance of Nitrogen Availability in the Pedosphere and Atmosphere

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