Water Potential Gradient in a Tall Sequoiadendron

Water potential gradient in a tall sequoiadendron.

With an elevator installed in a 90-meter tall Sequoiadendron to collect the samples, xylem pressure potential measurements were made approximately every 15 meters along 60 meters of the tree's height. The measured gradient was about -0.8 bar per 10 meters of height, i.e., less than the hydrostatic gradient. Correction of the xylem pressure potential data by calibration against a thermocouple ps...

Responses of Tall Fescue Cultivars to an Irrigation Gradient

particularly in the Intermountain Region. This has led to an increased interest in upgrading privately owned Seasonal availability of water is a major consideration in the manpastures through more intensive management and use agement and selection of plant materials for irrigated pastures in the Intermountain West, USA. Objectives were to evaluate the forage of improved cultivars of perennial g...

Coordination of leaf structure and gas exchange along a height gradient in a tall conifer.

The gravitational component of water potential and frictional resistance during transpiration lead to substantial reductions in leaf water potential (Psi(l)) near the tops of tall trees, which can influence both leaf growth and physiology. We examined the relationships between morphological features and gas exchange in foliage collected near the tops of Douglas-fir (Pseudotsuga menziesii (Mirb....

Threshold of potential concern: an early way to identify the ecosystem structural thresholds in a grazing gradient

Self Gradient among Potential Delinquents, A