Influence of elevated CO2 and O3 on Betula pendula Roth crown structure.

Abstract:

:Elevated CO(2) and ozone effects were studied singly and in combination on the crown structure of two Betula pendula clones. Measurements were made at the end of the second fumigation period in an open-top-chamber experiment with 9-year-old trees. Shoot ramification (number of long and short daughter shoots), shoot length, and number of metamers, leaves and buds were measured at four positions in every tree. As a result of increased temperature, trees in chambers had longer shoots and more frequent shoot ramification than control trees not enclosed in chambers. Ozone treatment decreased shoot ramification significantly. Additionally, ozone treatment resulted in an increased number of metamers in one clone. There was no statistically significant interaction between ozone effect and crown position; however, there was a slight tendency for the lower crown to be more affected by ozone. Elevated CO(2) caused a significant increase in the number of long-shoot metamers. Therefore, 2x ambient CO(2) concentration partly ameliorated the negative effect of ozone because the increased number of leaves per shoot counteracted the decreased branching. Although the main effects of elevated ozone and CO(2) were similar in the two clones, slight, statistically insignificant, differences appeared in their responses when interactions with crown position were considered.

journal_name

Ann Bot

journal_title

Annals of botany

authors

Kull O,Tulva I,Vapaavuori E

doi

10.1093/aob/mcg052

keywords:

subject

Has Abstract

pub_date

2003-04-01 00:00:00

pages

559-69

issue

5

eissn

0305-7364

issn

1095-8290

journal_volume

91

pub_type

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