TAILIEUCHUNG - Báo cáo lâm nghiệp:"Growth and biomass partitioning of Fagus sylvatica L. and Quercus robur L. seedlings in response to shading and small changes in the R/FR-ratio of radiation"

Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí lâm nghiệp đề tài:"Growth and biomass partitioning of Fagus sylvatica L. and Quercus robur L. seedlings in response to shading and small changes in the R/FR-ratio of radiation" | Ann. For. Sci. 60 2003 163-171 INRA EDP Sciences 2003 DOI forest 2003009 163 Original article Growth and biomass partitioning of Fagus sylvatica L. and Quercus robur L. seedlings in response to shading and small changes in the R FR-ratio of radiation Christian Ammer Lehrstuhl fur Waldbau Department fur Okosystem- und Landschaftsmanagement Wissenschaftszentrum fur Ernăhrung Landnutzung und Umwelt der TU Munchen Am Hochanger 13 85354 Freising Germany Received 5 May 2002 accepted 28 August 2002 Abstract - The effects of shading levels comparable to the light quantity and quality below the canopy of a Norway spruce Picea abies L. Karst. stand on one year old European beech Fagus sylvatica L. and pendunculate oak Quercus robur L. were tested. The treatments were shading of plants exposed to natural shade by using green synthetic nets PAR reduced to R FR-ratio shading of plants exposed to neutral shade by using black nets PAR reduced to R FR-ratio no shading control PAR 100 R FR-ratio . Beech seedlings showed a strong decrease in height diameter stem- branch- leaf- and root dry mass with decreasing light quantity. Neither growth rates nor total yield indicated an impact of slightly changed light quality R FR-ratio on growth and biomass partitioning of beech. Relative growth rate of the main stem dry mass of oak was considerably higher for the seedlings of the shade treatment with the reduced R FR-ratio than for the control and the other shade treatment whereas branch dry biomass exposed to changed light quantity and quality was reduced disproportional resulting in the lowest branch-stem-ratio. The tallest oak seedlings were found under the green nets treatment with reduced light quantity and quality whereas the control showed the shortest seedlings. light quality shading pedunculate oak European beech Résumé - Répartition de la croissance et de la biomasse de plants de Fagus sylvatica L. et de Quercus robur L. soumis à ombrage et à .

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