nov.) established in plantation form. These species occur naturally in central and western South Africa. Sap flow was monitored continuously over a full year in eight stems representing each species, using the heat ratio version of the heat pulse velocity technique. Plot sap flow was estimated ...
The most popular theory of the mechanism about sap flow in trees is cohesion-tension (CT) theory. However, it is difficult to explain how negative pressure of several MPa can exist and the continuity of water can maintain in those vulnerable vessels. Moreover, the existence of embolism is ...
What the towers don't see at night: nocturnal sap flow in trees and shrubs at two AmeriFlux sites in California. et al.What the towers don't see at night:Nocturnal sap flow in trees and shrubs at two AmeriFlux sites in California[J].Tree Physiology,2007, 27:... B Joshua,Fisher,D ...
Significant differences in the sap flow rate were found among the rootstocks, where D7 had a 29% higher sap flow rate than did TC (grafted and nongrafted trees). There were no differences among xylem vessel features in the stems of any of the varieties. However in the roots, D7 had ...
IN recent discussions on the upward movement of sap in trees, I have seen no mention of an interesting observation of Charles Darwin to be found in his ``Voyage of the Beagle'' (p. 258, John Murray, 1912 edition). He was exploring the Campana or Bell Mountain about 26 miles from ...
1.Sap flow density(SFD)of Betula platyphylla sampling trees in different diameter classes was measured by TDP system during growing season,and its character and seasonal trend of dominant tree,medium tree and suppressed tree were analyzed and compared.应用热扩散技术测定了帽儿山不同径级白桦样木生长...
Granier's thermal dissipation probe (TDP) method for measuring sap flow in trees: theory and practice Granier sap flow system is one of the most commonly used techniques for measurements of whole-tree water use in ecophysiological and forest hydrological st... LU Ping,L Urban,P Zhao - 《...
This 'cohesion theory' postulates that negative absolute pressure (liquid tension) must be present in trees more than 34 ft. high, or in any plant where the combined effects of hydrostatic head and flow resistance produce a pressure drop of more than one atmosphere. Investigators have had ...
The relationship between water loss via transpiration and stem sap flow in young apricot trees was studied under different environmental conditions and different levels of soil water status. The experiment was carried out in a greenhouse over a 2-week period (November 2-14, 1997) using three-year...
Maximum rates of sap flow in trees are reported to vary between 1 and 2 m hr–1 in conifers, 1 to 6 m hr–1 in diffuse-porous trees, and 4 to 40 m hr–1 in ring-porous trees (Zimmermann and Brown, 1971). The velocity of flow in conifers and diffuse-porous trees is low, as...