The Water Relations of <i>Pinus sylvestris</i> II. Comparative Field Studies of Water Potential and Relative Water Content

Hellkvist, Jerk

doi:10.1111/j.1399-3054.1973.tb04833.x

Cited by 10 publications

(3 citation statements)

References 21 publications

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“…Leaf water potential followed irradiance, air temperature and D both in cloudy and in clear weather (Figures 1 to 5), as found by other authors (Millar et al 1971, Hellkvist 1973a,b, Smart and Barrs 1973, Hellkvist et at. 1974, Hellkvist and Parsby 1976, Jarvis 1976).…”

Section: Discussionsupporting

confidence: 83%

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The Water Relations of Pinus sylvestris

Hellkvist¹,

Parsby²

1977

Physiologia Plantarum

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The water potential (β) in ten‐year‐old Scots pine trees (Pinus sylvestris L.) from four different latitudinal provenances ranging from 57° N to 67° N, growing in close proximity to each other, was measured in a pressure chamber during five selected periods between May 1972 and March 1973. Diurnal and seasonal patterns of φ are presented in relation to irradiance, air temperature and vapour pressure deficit (D) for one cloudy and one clear day in each experimental period. The largest daily amplitude in φ was found at the beginning and end of summer, indicating a larger resistance to water flow from soil to needles. As the soil water potentials (measured as pre‐dawn values) were, at the same time, the highest for the year, it is suggested that these changes in resistance from period to period mainly take place in the trees. Plots of φ against D during clear days, showed marked hysteresis as the result of the simultaneous influence on φ of several environmental factors. Close linear relations resulted when φ was plotted against potential evaporation rate (calculated from the Pennman‐Monteith formula). The slopes of these regression lines, essentially the flow resistance, showed marked seasonal variations, with the largest resistance found at the beginning and end of summer. In most periods the water relations of the trees from different provenances were strikingly similar. A continuous change in the water relations of the remote provenances towards the situation for the “home‐provenance” is indicated by the experimental results. It is concluded that trees from different latitudes after ten years of growth have about the same chance as the home provenance to survive periods during which their water balance might become critical.

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Section: Discussionsupporting

confidence: 83%

“…When the i//values presented in Figures 1 to 5 are plotted against D in clear weather (Figure 7), hysteresis can be seen, as previously shown in apple trees by Landsberg et at. (1975) and in pine trees (Hellkvist andParsby 1976, Jarvis 1976). This hysteresis occurs because i// also depends on irradiance (Jarvis 1976).…”

Section: Discussionmentioning

confidence: 99%

The Water Relations of Pinus sylvestris

Hellkvist¹,

Parsby²

1977

Physiologia Plantarum

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“…One of the reasons for the response of growth to temperature rise may be due to the changes in the physical properties of tracheid walls. When, as a result of transpiration, the water sources in the tree stem are depleted, the xylem water potential decreases (Hellkvist 1973;Hellkvist and Parsby 1976;Kaibiyainen et al 1981;Kramer and Kozlowski 1979;Schulze et al 1985). According to Nonami and Boyer (1990a, b) low water potential is the main reason for the decrease in the expansion growth rate because of changes in such physical properties of walls as flexibility and hydraulic conductivity.…”

Section: Radial Diameter Growthmentioning

confidence: 99%

Effects of environmental factors on wood formation in larch (Larix sibirica Ldb.) stems

Antonova

Stasova

1997

Trees

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AbstractmEffects of temperature and precipitation on xylem cell production by the cambium, radial cell expansion and secondary wall thickening in larch stems have been studied. The observations were carried out over two seasons on ten 50-to 60-year-old trees, growing in central Siberia and chosen according to growth rate (the number of cells in radial rows of each of two of the preceding seasons was equal). The data on the number of cells in differentiation zones and mature xylem along radial rows of tracheids, radial and tangential sizes of tracheids and their lumina were used for calculating cambial activity, the rates and durations of cell development in the zones, and both the thickness and cross-sectional areas of tracheid walls. The mean day air temperature, mean maximum diurnal and mean minimum nocturnal temperatures as well as precipitation have been shown by correlation and regression analyses to affect differentially separate stages of tracheid differentiation. Throughout all the seasons it was temperature that had the main influence on the initial divisions in the xylem, radial cell expansion and biomass accumulation. However, the levels of such an effect on separate stages of cytogenesis were different, especially the influence of nocturnal temperature on xylem cell production by cambium and primary wall growth. The optimum values of temperature and precipitation for cell production by cambium, for radial cell expansion and secondary wall thickening have been calculated. These optimum values of the first and second processes proved to be practically equal, while the last differs considerably in response to temperature. The data are discussed in connection with formation of early and late tracheids.

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The Water Status in the Plant Experimental Evidence

Richter¹

1976

Ecological Studies

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The Water Relations of Pinus sylvestris II. Comparative Field Studies of Water Potential and Relative Water Content

Cited by 10 publications

References 21 publications

The Water Relations of Pinus sylvestris

The Water Relations of Pinus sylvestris

Effects of environmental factors on wood formation in larch (Larix sibirica Ldb.) stems

The Water Status in the Plant Experimental Evidence

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