Diurnal patterns of water potential in the evergreen cloud forests of the Kaimai Ranges, North Island, New Zealand

Green, T. G. A.; Jane, G. T.

doi:10.1080/0028825x.1983.10428570

Cited by 14 publications

(3 citation statements)

References 18 publications

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“…However, enhanced stomatal resistance in response to increased vapor pressure differences between leaf and air has been reported for a number of tropical cloud forests (Körner et al 1983, Jane & Green 1985, Cavelier 1990). These increases in stomatal resistance were not accompanied by reductions in leaf water potentials (LWPs; Green & Jane 1983). Most literature cited suggests that a high evaporative demand between the forest canopy and the surrounding air is one of the main causes of decrease in stomatal conductance, thereby avoiding large water losses through transpiration.…”

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confidence: 99%

Leaf Gas Exchange in Canopy Species of a Venezuelan Cloud Forest

2009

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Tropical cloud forests are considered humid ecosystems with frequent cloud cover down to the ground surface. However, seasonal variation in precipitation may induce short-term water stress. For canopy leaves, this water stress may also be a consequence of large atmospheric vapor pressure deficits. The objective of this work was to study five canopy cloud forest species to determine if there are restrictions to leaf gas exchange as a consequence of seasonality in precipitation and to daily water deficit due to air evaporative demand mainly during maximum incoming radiation hours. Seasonal daily courses of microclimatic variables (air temperature, relative humidity, photosynthetic photon flux density) and plant responses (leaf water potential, stomatal conductance, CO 2 assimilation rates, leaf nitrogen concentration) were measured at 2400 m asl in Monterrey, an intermontane valley of the Venezuelan Andes. A gradient in terms of responses to water stress conditions was observed between the species, with Clusia multiflora (a 46% reduction in stomatal conductance between seasons) as the most affected and Miconia resimoides (increased stomatal conductance) responding more favorably to slight water stress conditions. If we consider the limitations of water stress and/or light conditions on CO 2 assimilation we may arrange the species into those in which water stress conditions have a greater impact on leaf carbon gain, those where light conditions are determinant and one in which both water stress and light conditions may affect leaf carbon assimilation.Abstract in Spanish is available at http://www.blackwell-synergy.com/loi/btp.

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confidence: 99%

Leaf Gas Exchange in Canopy Species of a Venezuelan Cloud Forest

2009

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“…In addition to being an important source of water, fog also increases nutrient and pollution deposition (Weathers et al, 2020 and citations therein). However, in combination with precipitation, fog may also promote waterlogging of soils, leading to water stress reflected in stomatal closure but not shoot water potential (Green and Jane, 1983). Similarly, saturating VPDs may reduce the ability of plants to take up soil nutrients, due to lack of a vapor pressure gradient between the leaf and the air sufficient to drive transpirational pull (Gisleröd et al, 1987;Del Amor and Marcelis, 2004).…”

Section: Water Balancementioning

confidence: 99%

Clouds and plant ecophysiology: missing links for understanding climate change impacts

Hughes,

Sanchez,

Berry

et al. 2024

Front. For. Glob. Change

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Observations and models indicate that human activity is altering cloud patterns on a global scale. Clouds impact incident visible and infrared radiation during both day and night, driving daily and seasonal variability in plant temperatures—a fundamental driver of all physiological processes. To understand the impacts of changing cloud patterns on essential plant-based processes such as carbon sequestration and food production, changes in local cloud regimes must be linked, via ecophysiology, with affected plant systems. This review provides a comprehensive treatment of cloud effects (apart from precipitation) on fundamental ecophysiological processes that serve as the basis of plant growth and reproduction. The radiative effects of major cloud types (cumulus, stratus, cirrus) are differentiated, as well as their relative impacts on plant microclimate and physiology. Cloud regimes of major climate zones (tropical, subtropical, temperate, polar) are superimposed over recent changes in cloud cover and primary productivity. The most robust trends in changing global cloud patterns include: (i) the tropical rain belt (comprised mostly of deep convective clouds) is narrowing, shifting latitudinally, and strengthening, corresponding with shorter but more intense rainy seasons, increased clouds and precipitation in some parts of the tropics, and decreases in others; (ii) tropical cyclones are increasing in intensity and migrating poleward; (iii) subtropical dry zones and drier conditions at these latitudes; (iv) summer mid-latitude storm tracks are weakening and migrating poleward, and clouds in temperate regions are decreasing; and (v) clouds over the Arctic are increasing. A reduction in coastal fog and low clouds (including those associated with montane cloud forests) have also been observed, although these trends can be partially attributed to local patterns of deforestation, urbanization, and/or reductions in aerosols associated with clean air initiatives. We conclude by highlighting gaps in the cloud-ecophysiology literature in order to encourage future research in this under-studied area.

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“…Three collections of shoots of tawari, kamahi, quintinia (Quintinia acutifolia Kirk), and silver beech were made at 4-week intervals, beginning on 5 November 1982 from sites at 500, 600, 800, and 900 m on Mt Te Aroha (for site descriptions see Green & Jane 1983). Each collection commenced in the early morning of cool days at the lowest altitude and was completed by II am to ensure that shoots were at, or close, to full turgor.…”

Section: Field Studies In Kaimai Rangesmentioning

confidence: 99%

Changes in osmotic potential during bud break and leaf development of Nothofagus menziesii, Weinmannia racemosa, Quintinia acutifolia, and Ixerba brexioides

Green

Jane

1983

New Zealand Journal of Botany

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Osmotic potential (III,) was determined from freezing point depression measurement on leaf exudates. Similar values of 1jI, were found from pressure volume methods. Increased 1jI, before and during budbreak was followed by a recovery towards normal values. This pattern is similar to that usually reported for evergreen trees. IjIs was generally higher on sites of greater altitude reflecting the wetter environment. The results suggest that the seasonal variation in 1jI, is greater than betweensite differences.

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Diurnal patterns of water potential in the evergreen cloud forests of the Kaimai Ranges, North Island, New Zealand

Cited by 14 publications

References 18 publications

Leaf Gas Exchange in Canopy Species of a Venezuelan Cloud Forest

Leaf Gas Exchange in Canopy Species of a Venezuelan Cloud Forest

Clouds and plant ecophysiology: missing links for understanding climate change impacts

Changes in osmotic potential during bud break and leaf development of Nothofagus menziesii, Weinmannia racemosa, Quintinia acutifolia, and Ixerba brexioides

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