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AbstractBranch water exchange and total tree water uptake were measured in a mixed Norway spruce and Scots pine stand in central Sweden during the 1995 and 1996 growing seasons. Branch transpiration was scaled to canopy level on the basis of a branch conductance model, using vertical needle-area distributions obtained by destructive sampling. Comparison with total tree water uptake scaled to canopy...
AbstractOn range-wide and regional scales, climate and site factors exert control over tree growth, masking the genetic basis of biomass accumulation and allocation. To determine intrinsic population differences in productivity, aboveground net primary production (ANPP) was measured in 16-year-old Scots pine from 19 geographically distinct populations grown in a common garden experiment in central...
. In the semi-desert environment of the Mu Us Sandland, the vegetation is composed chiefly of shrubs and semi-shrubs, coverage normally amounting to 30–40%. However, an exception can be found in the community of Sabina vulgaris Antoine, an evergreen shrub, which tends to grow so densely that it covers the sand dunes completely. Previous research has indicated that the high density of Sabina is parallelled...
Abstract. In the semi-desert environment of the Mu Us Sandland, the vegetation is composed chiefly of shrubs and semi-shrubs, coverage normally amounting to 3040%. However, an exception can be found in the community of Sabina vulgaris Antoine, an evergreen shrub, which tends to grow so densely that it covers the sand dunes completely. Previous research has indicated that the high density of Sabina...
Abstract. The latewood lignin content, maximum density and total ring width of ten consecutive annual increments were determined in treeline Norway spruce (Picea abies [L.] Karst.) using ultraviolet (UV) microscopy and radiodensitometry, respectively. A positive correlation between the total ring width and the mean temperature of mid-July to August was identified, as was one between the maximum density...
. The latewood lignin content, maximum density and total ring width of ten consecutive annual increments were determined in treeline Norway spruce (Picea abies [L.] Karst.) using ultraviolet (UV) microscopy and radiodensitometry, respectively. A positive correlation between the total ring width and the mean temperature of mid-July to August was identified, as was one between the maximum density and...
AbstractThe stomatal distribution, non-uniform stomatal closure, stomatal conductance, and gas-exchange of several hybrid poplar clones under light stress were studied using scanning electron microscopy (SEM) and gas-exchange. Non-uniform stomatal closure was found under natural light stress by SEM, and there was a linear relationship between the stomatal aperture and stomatal conductance. We suggest...
. In order to clarify the sources of soil acidification below stands of hinoki (Chamecyparis obtusa Sieb. et Zucc.), artificial stemflow experiments were performed to separate out the role rainfall acidity has from that of the acidity potentially occurring during stemflow. Various solutions, including distilled water, NaCl, NH4Cl, KCl and CaCl2+MgCl2 solutions, were added in a controlled manner to...
Abstract. As part of an intensive monitoring programme (MON.I.TO, Intensive Monitoring of Forests in Tuscany), a 3-year survey was carried out, which included three tree species (beech, Fagus sylvatica L.; Turkey oak, Quercus cerris L.; holm-oak, Quercus ilex L.) located at six different sites. Leaves were sampled annually and analysed for nutrient concentrations (nitrogen, sulphur, phosphorus, magnesium,...
. Long-term changes in sessile oak (Quercus petraea Liebl.) growth and wood density were studied using cores collected from 99 even-aged high forest stands between 56 and 187 years old, located in northeastern and north-central France. Growth and density trends were tested by analysis of variance and covariance. Two models were applied to two samples, sample A and sample B (sample B being a sub-sample...
Abstract. In order to clarify the sources of soil acidification below stands of hinoki (Chamecyparis obtusa Sieb. et Zucc.), artificial stemflow experiments were performed to separate out the role rainfall acidity has from that of the acidity potentially occurring during stemflow. Various solutions, including distilled water, NaCl, NH4Cl, KCl and CaCl2+MgCl2 solutions, were added in a controlled manner...
On range-wide and regional scales, climate and site factors exert control over tree growth, masking the genetic basis of biomass accumulation and allocation. To determine intrinsic population differences in productivity, aboveground net primary production (ANPP) was measured in 16-year-old Scots pine from 19 geographically distinct populations grown in a common garden experiment in central Poland...
Branch water exchange and total tree water uptake were measured in a mixed Norway spruce and Scots pine stand in central Sweden during the 1995 and 1996 growing seasons. Branch transpiration was scaled to canopy level on the basis of a branch conductance model, using vertical needle-area distributions obtained by destructive sampling. Comparison with total tree water uptake scaled to canopy level...
. As part of an intensive monitoring programme (MON.I.TO, Intensive Monitoring of Forests in Tuscany), a 3-year survey was carried out, which included three tree species (beech, Fagus sylvatica L.; Turkey oak, Quercus cerris L.; holm-oak, Quercus ilex L.) located at six different sites. Leaves were sampled annually and analysed for nutrient concentrations (nitrogen, sulphur, phosphorus, magnesium,...
Abstract. Long-term changes in sessile oak (Quercus petraea Liebl.) growth and wood density were studied using cores collected from 99 even-aged high forest stands between 56 and 187years old, located in northeastern and north-central France. Growth and density trends were tested by analysis of variance and covariance. Two models were applied to two samples, sample A and sample B (sample B being a...
The stomatal distribution, non-uniform stomatal closure, stomatal conductance, and gas-exchange of several hybrid poplar clones under light stress were studied using scanning electron microscopy (SEM) and gas-exchange. Non-uniform stomatal closure was found under natural light stress by SEM, and there was a linear relationship between the stomatal aperture and stomatal conductance. We suggest a...
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