Electronic Journal of Polish Agricultural Universities (EJPAU) founded by all Polish Agriculture Universities presents original papers and review articles relevant to all aspects of agricultural sciences. It is target for persons working both in science and industry,regulatory agencies or teaching in agricultural sector. Covered by IFIS Publishing (Food Science and Technology Abstracts), ELSEVIER Science - Food Science and Technology Program, CAS USA (Chemical Abstracts), CABI Publishing UK and ALPSP (Association of Learned and Professional Society Publisher - full membership). Presented in the Master List of Thomson ISI.
2006
Volume 9
Issue 3
Topic:
Forestry
ELECTRONIC
JOURNAL OF
POLISH
AGRICULTURAL
UNIVERSITIES
Jelonek T. , Pazdrowski W. , Tomczak A. , Stypuła I. 2006. RADIAL AND AXIAL VARIABILITY OF THE PROPORTION OF SAPWOOD AND HEARTWOOD IN STEMS OF SCOTS PINE TREES (PINUS SYLVESTRIS L.) DEVELOPED IN CONDITIONS OF FORMER FARMLANDS AND TYPICAL FOREST SITES, EJPAU 9(3), #02.
Available Online: http://www.ejpau.media.pl/volume9/issue3/abs-02.html

RADIAL AND AXIAL VARIABILITY OF THE PROPORTION OF SAPWOOD AND HEARTWOOD IN STEMS OF SCOTS PINE TREES (PINUS SYLVESTRIS L.) DEVELOPED IN CONDITIONS OF FORMER FARMLANDS AND TYPICAL FOREST SITES

Tomasz Jelonek1, Witold Pazdrowski1, Arkadiusz Tomczak1, Ireneusz Stypuła2
1 Department of Forest Utilization, University of Life Sciences in Poznań, Poland
2 Białogard Forest Division, Szczecinek Regional Directorate of State Forests RDSF, Poland

 

ABSTRACT



The study makes an attempt to ascertain radial and axial variability in the proportion of sapwood and heartwood in the stems of Scots pine trees which developed in different conditions of growth and development.

In general, pine trees growing in conditions of former farmlands were characterised by a greater proportion (in the forest site types which were taken under consideration) of heartwood and smaller proportion of sapwood than pine trees which developed in conditions of typical forest soils.

Both in the case of pines derived from the former farmlands and those that developed on typical forest soils, a greater proportion of heartwood was observed on the fresh coniferous forest (fresh coniferous forest) site type, while sapwood was found prevalent in pine trees which developed in conditions of the mixed fresh coniferous forest (mixed fresh coniferous forest) site type.

The authors found radial and axial irregularities in the process of heartwood formation in the stems of Scots pines which developed in conditions of the former farmlands and forest soils on fresh coniferous forest and mixed fresh coniferous forest against the background of biosocial classes. The vertical range of heartwood may be affected by a number of factors of which the tree crown appears to be the most important one.

It is further believed that the proportion of the sapwood zone and the rate and course of the heartwood formation process may be influenced by the size and the transpirational efficiency of tree crowns, development of water blockages in the conducting elements, tree biosocial position in the stand as well as the type of soil on which a given tree is growing.

A significant impact of the crown on the formation of the sapwood zone in tree trunks is confirmed by the obtained high determination coefficients R2 for the dependence of the mean width of the sapwood zone on the volume and surface area of crowns.

Key words: Scots pine, sapwood, heartwood, former farmlands, fresh coniferous forest, mixed fresh coniferous forest.


Tomasz Jelonek
Department of Forest Utilization,
University of Life Sciences in Poznań, Poland
Wojska Polskiego 71 A, 60-625 Poznań, Poland
Phone: (+48 61) 8487754
email: tjelonek@au.poznan.pl

Witold Pazdrowski
Department of Forest Utilization,
University of Life Sciences in Poznań, Poland
Wojska Polskiego 71 A, 60-625 Poznań, Poland
Phone: (+48 61) 8487757
email: kul@au.poznan.pl

Arkadiusz Tomczak
Department of Forest Utilization,
University of Life Sciences in Poznań, Poland
Wojska Polskiego 71 A, 60-625 Poznań, Poland
Phone: (+48 61) 8487754
email: atomczak@au.poznan.pl

Ireneusz Stypuła
Białogard Forest Division,
Szczecinek Regional Directorate of State Forests RDSF, Poland

email: iron-pl@wp.pl

Responses to this article, comments are invited and should be submitted within three months of the publication of the article. If accepted for publication, they will be published in the chapter headed 'Discussions' and hyperlinked to the article.