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Photosynthetic O 2 evolution at high irradiances (approximately 600–1000 μmol m −2 s −1 ) and O 2 uptake in darkness were measured in needles of control, irrigated and irrigated-fertilized trees of Norway spruce ( Picea abies (L.) Karst.). Measurements were made at 20 °C and at high CO 2...
Ecotypic variations in leaf conductance, soil-to-leaf hydraulic conductance, components of tissue water potential, hydraulic architecture parameters and xylem embolism were examined in greenhouse-grown two-year-old Aleppo pine ( Pinus halepensis Mill.) seedlings from six origins representing the...
An existing model of light and water use by crops (RESCAP) was adapted and evaluated for trees. In the model, growth on any given day is determined either by the amount of intercepted radiation (by means of the light utilization coefficient, ε) or by the maximum rate of water extraction by roots...
Roots of hardwoods have been shown to be more vulnerable to xylem cavitation than stems. This study examined whether this pattern is also observed in a conifer species. Vulnerability to cavitation was determined from the pressure required to inject air into the vascular system of hydrated roots...
Naturally seeded Scots pine ( Pinus sylvestris L.) trees, age 25–30 years, were subjected to two soil-nitrogen-supply regimes and to elevated atmospheric CO 2 concentrations by the branch-in-bag method from April 15 to September 15 for two or three years. Gas exchange in detached shoots was...
We studied the effects of five thinning treatments (T1 = 5.5, T2 = 11, T3 = 16.5, T4 = 22.5 and T5 = 28.5 m 2 ha −1 basal area under bark) × two fertilizer treatments (F0 = unfertilized and F1 = fertilized with 400 kg ha −1 N plus 229 kg ha −1 P) on growth and water relations of pole-sized...
Small Shorea stenoptera Burck. (Dipterocarpaceae) trees of reproductive age growing in an arboretum in west Java were studied to determine the pattern of vegetative shoot development, the time and method of floral initiation and the effect of paclobutrazol on floral enhancement. Vegetative buds...
Aboveground biomass allocation, and height and branch growth were studied in saplings of the shade-tolerant conifer, Abies amabilis Dougl. ex Forbes growing in large openings and in the understory of an old-growth forest in western Oregon. The presence of annual overwintering budscale scars was...
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