Analysis of regeneration success for downy oak (Quercus pubescens) at conversion of Austrian black pine (Pinus nigra) forests
Abstract
Intense grazing and clearing by fire caused extremely poor stand structure, missing protection against damage by downpour and bad condition of the forests at the beginning of the last century in the region Vinschgau in South Tyrol. Therefore a large-scale afforestation programm was carried out in the period 1951 to 1965, were almost 6.000.000 seedlings of Austrian black pine (Pinus nigra) were planted in the course of the project. The use of none site suited tree species caused mighty raw humus layer, which prevents natural regeneration of local tree species like downy oak (Quercus pubescens), flowering ash (Fraxinus ornus), hop hornbeam (Ostrya carpinifolia), grasses and herbs. The pine processinoray caterpillar (thaumetopoea pinivora) has become a source of frequently occuring forest pests. This circumstances forced the local forest department to evolve a conversion strategy. One year old seedlings of downy oak had been planted in the understory of slightly thinned black pine stands during the years 1995 to 1999. During the first years after planting a large proportion of the young oak seedlings failed to succeed at unlike environmental conditions. In order to assess the regeneration success of the oak seedlings this study was carried out. Detailed information of the young plants (height, root collar diameter, number of foliage, height increment) in 490 biocells have been investigated in the summer periode of 1999. Additionally stand (e.g. biometric data, canopy structure) and site (e.g. vegetation, ground cover, soil type) information of the thinned forest stands have been analysed. Hemispherical photographs have been used to estimate light penetration into canopies and to figure canopy architecture of the overstory of the biocells in the forest stand. The experimental plots have been chosen in dependance of differing sites, time of plantation and provenances.
keywords hemispherical photographs Anwuchserfolg
Publikationen
Analysis of light environments for downy oak (Quercus pubescens) at conversion of Austrian black pine (Pinus nigra) forests by the use of hemispherical photographs.
Autoren: Vacik, H., Oberlechner, K. Jahr: 2000
Conference & Workshop proceedings, paper, abstract
Regeneration and growth success of downy oak (Quercus pubescens) in secondary Austrian black pine forests (Pinus nigra) in Vinschgau, Southtyrol
Autoren: Oberlechner, VK; Vacik, H Jahr: 2003
Journal articles
Project staff
Harald Vacik
Ao.Univ.Prof. Dipl.-Ing. Dr.nat.techn. Harald Vacik
harald.vacik@boku.ac.at
Tel: +43 1 47654-91312
Project Leader
30.05.1999 - 31.12.2000
BOKU partners
External partners
Autonome Provinz Bozen, Department of Forestry
none
partner