Because the life processes of the plant are related in a complex
way to the balance between the water demand of the atmosphere and
the water availability to the plant root, an exploration of the dynamic
status of water in the plant is very important. The stomata constitute
the main...
The influence of soil moisture stress and soil temperature on
transpiration has never been determined explicitly. This relationship
has been neglected mainly because of the lack of a satisfactory method
to control soil moisture stress.
A technique was developed to evaluate this relationship by
controlling soil moisture stress with osmotic...
Sorbitol-induced osmotic stress (SIOS) to the root was found to be effective in
reducing transpirational water loss in plants during water stress. Mechanisms of SIOS in
stomatal control were investigated in containerized apples (Malus domestica Borkh.
'Gala'/M26) when leaf water potential (Ψw), osmotic potential (Ψs), turgor potential (Ψp),
stomatal conductance...
Four different plot types were established in shrub and tree comunitities in Little Elk Valley in southwest Oregon. Ten functional (F) plots were cleared of all vegetation in a radius of three times the height of the surrounding vegetation around a single Pacific madrone (Arbutus menziesii Pursh.) tree. Ten competition...
Four study sites were selected along an altitudinal gradient on Mt. Ashland in the Siskiyou Mountains of southern Oregon. The altitudinal gradient roughly corresponded to a gradient in temperature and water availability ranging from very hot and dry to cool and moist. Air and soil temperatures were continuously measured on...
The objective of this study was to examine the transpirational
behavior of Douglas-fir seedlings from two origins,, each grown in
two environments, and subject to a range of moisture stress. Forks
and Goldendale, Washington were the mesic and xeric seed origins
respectively. One-half of the seedlings from each origin was...
The objective of this study was to determine the effect of age
on rates of transpiration by Douglas-fir seedlings. Seeds were
collected from a xeric site (Goldendale, Washington) and a mesic
site (Forks, Washington). The seedlings were grown in a cold frame
and in a growth chamber for periods of...
In this study transpiration rates were measured on Douglas-fir
seedlings from five seed sources. The seedlings were grown under
two environments, a growth chamber and outside in cold frames.
Transpiration was measured at two ages, 4 and 16 weeks. Comparison
of transpiration rates was made at low soil moisture stress....
Preliminary results of a comprehensive study of hydraulic fluctuations in Douglas-fir (Pseudotsuga menziesii) stems in response
to plant water status and environment are presented. Diurnal changes in stem circumference near DBH of a dominant Douglas-fir were monitored using automated band dendrometers. Measurements of transpiration rate, internal moisture stress and stomata...
