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Root and transpiration studies on young Norway spruce trees with die back symptoms in Sweden
Author(s) -
Johansson M.,
Wästerlund I.
Publication year - 1979
Publication title -
european journal of forest pathology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.535
H-Index - 49
eISSN - 1439-0329
pISSN - 0300-1237
DOI - 10.1111/j.1439-0329.1979.tb00687.x
Subject(s) - transpiration , biology , botany , shoot , horticulture , apex (geometry) , spring (device) , picea abies , photosynthesis , mechanical engineering , engineering
In the spring of 1977, scattered trees in young plantations of Norway spruce showed discoloration and loss of 1976 needles on twigs just below the apex. The main roots of damaged trees were smaller than those of healthy trees, and the extension roots lacked short roots and mycorrhizae. The transpiration rate of the current shoots of damaged trees was also higher. The damage was assumed to be the result of drought during the two previous years; the trees were thought to differ genetically in their ability to withstand water stress.