Water utilization by trees, with special reference to the economic forest species of the north temperate zone

Abstract

mainly on transpiration, wilting , osmotic adjustments, of all plant parts in many situations; ; however a very interestin read; good revies on knowledge on stomatal density; alos a part on adaptation to dry environments; cites Kearney and Shantz (Nr 120) that drought resistance may be attained in many different ways, such as drought escaping, drought evading drought enduring and drought resisting, and he describes well all of these; cites Brenner 1902 (Nr 21) for quercus pedunculata (robur) having fewer stomata on drier sites; also on stomatal control and factors influenceing stomatal movements; in teh chapter "water consumption by trees page 75" he starts talking about water requirement abd Briggs and shantz; he has a point of view of production; talks about problems of measuring transpiration on adult trees; cites Von Höhnel (98, 99) with a watering / weighing experiment during a growing season on trees 5-7 years old, however does only calculate water loss per dry weight of leav material; he states that "as to actual water requirement, i.e. the number of grams of water utilized by the plant per gram of dry weight increment, very few figures are available for trees", Water Requirement from page 79 onwards : says "very few figures are available for trees" : Vater 219 reworked the data from Von Höhnel and Ebermayer 398 g water / g DW for beech, 391 for spruce, 166 for pine; Oelkers 164 10 different species; bates 11 8 conifer species; Pearson 167 4 confier species; reviews some attemps to estimate water requirement in forest stands; discusses difficulties of transferring pot experiments to the field