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Báo cáo lâm nghiệp: " Long-term effects of CO2 enrichment on bud phenology and shoot growth patterns of Norway spruce juvenile tree"

Tuyển tập những bài báo cáo nghiên cứu khoa học hay nhất được đăng trên tạp chí JOURNAL OF FOREST SCIENCE đề tài: Long-term effects of CO2 enrichment on bud phenology and shoot growth patterns of Norway spruce juvenile trees. | JOURNAL OF FOREST SCIENCE 56 2010 6 251-257 Long-term effects of CO2 enrichment on bud phenology and shoot growth patterns of Norway spruce juvenile trees R. Pokorny1 I. Tomásková1 I. Drápelová2 J. Kulhavý2 M. V. Marek1 2 -Laboratory of Plant Ecological Physiology Institute of Systems Biology and Ecology Academy of Sciences of the Czech Republic Brno Czech Republic Institute of Forest Ecology Mendel University in Brno Brno Czech Republic ABSTRACT Bud phenology and shoot elongation growth were monitored on Norway spruce Picea abies L. Karst. trees grown inside glass domes with adjustable windows for six years under ambient 355 pmol CO2-mol-1 and elevated 700 pmol CO2-mol-1 atmospheric CO2 concentrations CO2. Each treatment consisted of two stand densities - sparse 5 000 trees-ha-1 and dense 10 000 trees-ha-1 . The age of spruce trees was 10 years at the beginning of the experiment. Elevated CO2 slightly accelerated the consequential bud germinating phases and it significantly induced shoot elongation growth especially of sun-exposed shoots in a stand with sparse density. This accelerated growth lasted one to three weeks after full bud development in E compared to A. At the end of the growing season the total shoot length did not show any differences between the treatments. We supposed that limiting nitrogen supply to needles slowed down subsequent shoot elongation growth in E treatment. Nevertheless faster shoot growth in elevated CO2 conditions can enhance the carbon sink in spruce due to prolongation of the growing season. Keywords bud elevated CO2 Norway spruce phenology shoot length Phenology is principally concerned with the dates of the first occurrence and duration of natural events in the plant annual cycle. Temperature as the factor accompanied with higher air CO2 is regarded as an important environmental factor inducing plant growth manifested by bud flushing and shoot development Hannerz 1999 . However not only the temperature Linkosalo et al. 2000 but .