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Abstract. Leaf-level gas exchange and leaf water potential (leaf) measurements were made over a diurnal time-course in multi-aged and even-aged stand structures of ponderosa pine (Pinus ponderosa Dougl. ex Laws.) in central Oregon (June) and western Montana (July) to test for differences in physiological performance due to stand structure. Total site occupancy was similar between the geographic regions...
Leaf structure and physiology are thought to be closely linked to leaf longevity and leaf habit. Here we compare the seasonal variation in leaf hydraulic conductance (kleaf) and water potential of two evergreen tree species with contrasting leaf life spans, and two species with similar leaf longevity but contrasting leaf habit, one being deciduous and the other evergreen. One of the evergreen...
Three- and four-year-old potted, greenhouse-grown cedar seedlings were subjected to two different watering regimes: half received full water supply and the other half was submitted to moderate drought (50% of the full water supply). Height growth was the greatest for C. atlantica and the most-limited for C. brevifolia in the well-watered set. However, in the dry set, height growth was less affected...
Understanding daily stem size variation is important as the net increment of a forest stand is ultimately determined by the accumulation of daily increment events. In this study, measurements of stem size at high spatial and temporal resolution were made using two commercial hybrid Eucalyptus clones [E. grandis × urophylla (GU) and E. grandis × camaldulensis (GC)] over a period of more than 3.5 years...
As trees grow taller, the energetic cost of moving water to the leaves becomes higher and could begin to limit carbon gain and subsequent growth. The hydraulic limitation hypothesis states that as trees grow taller, the path length and therefore frictional resistance of water flow increases, leading to stomatal closure, reduced photosynthesis and decreased height growth in tall trees. Although this...
The dynamic responses of stomatal conductance (gs) net photosynthesis (A) and leaf water potential (Ψleaf) to a progressive drought were examined in nine poplar clones (Populus spp.) with contrasting drought tolerance from the Canadian Prairies, a region prone to frequent droughts. Plants were grown in a greenhouse and either well-watered or drought preconditioned (5–6 cycles of drought) for 8 weeks...
We analyzed the differences between irrigated and non-irrigated plants of three congeneric Styrax species that present distinct distribution patterns in the physiognomies of the Cerrado vegetation in Brazil. Styrax ferrugineus showed a stomatal conductance (gs) unresponsive to soil water deficit in potted plants. This may explain the high gas exchange and photochemical efficiency found in this species,...
Radial variations in vessel features (vessel lumen area and frequency) of four tropical tree species grown in tropical savanna, monsoon, and rainforest climates were investigated to detect indistinct annual rings. Leaf and soil water potentials were measured periodically to show annual variations in water availability and their relationship to radial variations in vessel features. In addition, the...
Key messagePhysiological characteristics except WUE ofH. ammodendronhave obvious response to rainfall pulses of 6–12mm, and rainfall in this range at least is “effective” precipitation forH. ammodendron. Abstract In water-limited ecosystems, pulses of rainfall can trigger a cascade of plant physiological responses. Small precipitation events account for a large proportion of the precipitation...
Key messagePotential benefits of biochar and compost soil amendments may not be realised in high-input perennial horticultural systems such as an apple orchard. Abstract Mechanistic understanding of how biochar affects tree physiology is deficient. We determined the effects of biochar amendment on crop yields, growth and tree physiology of a high-input perennial horticultural system. The biochar...
Key messageStomatal regulation involves beneficial effects of pruning mulch and irrigation on leaf photosynthesis inPrunus yedoensisandGinkgo bilobaunder moderate drought.G. bilobashowed conservative water use under drought. ...
Key message The analysis of the growth behaviour, wood anatomical, and eco-physiological traits of twoBougainvilleagenotypes, trained to two shapes and subjected to different irrigation regimes, fully supports the idea that structural properties interact with cultural practices (i.e., training) in determining the adaptive capability of plants, hence their productivity and survival. Abstract Bougainvillea...
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