Abstract
Frost during the summer is very common in Sweden. Two kinds of summer frosts exists; one is called advection frost which is caused by cold air coming down over the country from the north and the other is an inversion frost caused by long-wave radiation from the ground taking place during calm clear nights. In this way the air closest to the ground is cooled. Eleven experimental areas are described as regards prehistory, vegetation, frequency of summer frosts, and energy forestry tests in progress. The amount of frost injuries is reported. Differences in frost hardiness of fast growing Salix clones in the growing state have been demonstrated. The results support the idea that the formation of ice crystals inside the growing tissues always take place around -2 degree C and that this ice crystal formation damages the growing part of the shoot of all tested clones. A fast growing shoot of Salix species has a longer elongation zone and this explains why a fast-growing shoot is more severly damaged than a slowly growing one at the same frost temperature. If the different clones are in a growing state there are only small differences in the amount of frost damage. On
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Citation Formats
Christersson, L, Fircks, H von, and Perttu, K.
Frosts during the growing season. Frequency of occurrence and effects on current energy forestry. Sommarfroster. Foerekomster och effekter paa befintliga energiskogsodlingar.
Sweden: N. p.,
1984.
Web.
Christersson, L, Fircks, H von, & Perttu, K.
Frosts during the growing season. Frequency of occurrence and effects on current energy forestry. Sommarfroster. Foerekomster och effekter paa befintliga energiskogsodlingar.
Sweden.
Christersson, L, Fircks, H von, and Perttu, K.
1984.
"Frosts during the growing season. Frequency of occurrence and effects on current energy forestry. Sommarfroster. Foerekomster och effekter paa befintliga energiskogsodlingar."
Sweden.
@misc{etde_7802469,
title = {Frosts during the growing season. Frequency of occurrence and effects on current energy forestry. Sommarfroster. Foerekomster och effekter paa befintliga energiskogsodlingar}
author = {Christersson, L, Fircks, H von, and Perttu, K}
abstractNote = {Frost during the summer is very common in Sweden. Two kinds of summer frosts exists; one is called advection frost which is caused by cold air coming down over the country from the north and the other is an inversion frost caused by long-wave radiation from the ground taking place during calm clear nights. In this way the air closest to the ground is cooled. Eleven experimental areas are described as regards prehistory, vegetation, frequency of summer frosts, and energy forestry tests in progress. The amount of frost injuries is reported. Differences in frost hardiness of fast growing Salix clones in the growing state have been demonstrated. The results support the idea that the formation of ice crystals inside the growing tissues always take place around -2 degree C and that this ice crystal formation damages the growing part of the shoot of all tested clones. A fast growing shoot of Salix species has a longer elongation zone and this explains why a fast-growing shoot is more severly damaged than a slowly growing one at the same frost temperature. If the different clones are in a growing state there are only small differences in the amount of frost damage. On the other hand, there are great differences between the clones in the capacity of the surviving lateral buds to sprout. This capacity is foremost seen in clones of the species Salix dasyclados. Two year older shoots of different Salix species have never been damaged by summer frost because summer frosts do not reach the elongating zone of these shoots. In conclusions measures are listed on how to prevent or decrease the injuries caused by summer frosts. With 21 refs.}
place = {Sweden}
year = {1984}
month = {Jan}
}
title = {Frosts during the growing season. Frequency of occurrence and effects on current energy forestry. Sommarfroster. Foerekomster och effekter paa befintliga energiskogsodlingar}
author = {Christersson, L, Fircks, H von, and Perttu, K}
abstractNote = {Frost during the summer is very common in Sweden. Two kinds of summer frosts exists; one is called advection frost which is caused by cold air coming down over the country from the north and the other is an inversion frost caused by long-wave radiation from the ground taking place during calm clear nights. In this way the air closest to the ground is cooled. Eleven experimental areas are described as regards prehistory, vegetation, frequency of summer frosts, and energy forestry tests in progress. The amount of frost injuries is reported. Differences in frost hardiness of fast growing Salix clones in the growing state have been demonstrated. The results support the idea that the formation of ice crystals inside the growing tissues always take place around -2 degree C and that this ice crystal formation damages the growing part of the shoot of all tested clones. A fast growing shoot of Salix species has a longer elongation zone and this explains why a fast-growing shoot is more severly damaged than a slowly growing one at the same frost temperature. If the different clones are in a growing state there are only small differences in the amount of frost damage. On the other hand, there are great differences between the clones in the capacity of the surviving lateral buds to sprout. This capacity is foremost seen in clones of the species Salix dasyclados. Two year older shoots of different Salix species have never been damaged by summer frost because summer frosts do not reach the elongating zone of these shoots. In conclusions measures are listed on how to prevent or decrease the injuries caused by summer frosts. With 21 refs.}
place = {Sweden}
year = {1984}
month = {Jan}
}