Root-freezing damage in the containerized nursery: impact on plantation sites – A review |
| |
Authors: | FJ Bigras D Dumais |
| |
Institution: | (1) Natural Resources Canada, Canadian Forest Service, 1055 du P.E.P.S., G1V 4C7 Sainte-Foy (QC), Canada;(2) Ministère des Ressources naturelles, de la Faune et des Parcs, Direction de la recherche forestière, 2700 Einstein, G1P 3W8 Sainte-Foy, QC, Canada |
| |
Abstract: | Root-freezing damage frequently occurs in forest nurseries operating in cold climates. This type of damage arises because:
(i) environmental cues for root cold acclimation differ from those for shoot acclimation; (ii) the root growing season is
longer than shoot growing season; (iii) strong differences in root cold tolerance exist among species and provenances; (iv)
root tissues are less frost tolerant than those of shoots, and young roots are less tolerant than mature ones; and (v) cultural
practices can adversely affect root cold hardiness. To quantify root-freezing damage, different techniques have been tested.
Electrolyte leakage is the most widely used and provides a good correlation with survival and regrowth. The impact of root-freezing
damage on seedling performance has been studied under controlled and field conditions. Seedlings with root-freezing damage
showed a reduction in survival and growth. Survival was reduced when root-freezing damage are severe. Growth reduction is
mainly explained by a reduction in water and nitrogen uptake. The identification of a threshold in root-freezing damage below
which survival and regrowth would not be affected should be determined for species most commonly used in reforestation.
An erratum to this article is available at . |
| |
Keywords: | Conifer Container Frost Growth Physiology Reforestation Seedling |
本文献已被 SpringerLink 等数据库收录! |
|