Visually estimated defoliation class vs. other condition variables in Picea abies : Air Pollution and Forest Decline. 14th International Meeting for Specialists in Air Pollution Effects on Forest Ecosystems

1989

1 Tab., 2 Lit. Ang., En, Zfsg. En

Unselbständiges Werk

9091

200034823

Defoliation class estimation is used in Finland for monitoring forest condition on the national level (Jukola-Sulonen et al. 1987). Visual estimates of needle loss ware subjective and sensitive to many sources of error. The aim of this study is to assess the relationship between defoliation class and a umber of other variables depicting the vitality of Picea abies. In addition, simultaneous incorporation of information on several condition variables to form a vitality index is discussed.