TAILIEUCHUNG - Báo cáo lâm nghiệp:"Interaction of initial seedling diameter, fertilization and weed control on Douglas-fir growth over the first four years after planting"

Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí lâm nghiệp đề tài:"Interaction of initial seedling diameter, fertilization and weed control on Douglas-fir growth over the first four years after planting" | Ann. For. Sci. 60 2003 625-635 INRA EDP Sciences 2004 DOI forest 2003055 625 Original article Interaction of initial seedling diameter fertilization and weed control on Douglas-fir growth over the first four years after planting Robin Rose J. Scott Ketchum Vegetation Management Research Cooperative College of Forestry Oregon State University Corvallis OR 97331 USA Received 24 June 2002 accepted 28 February 2003 Abstract - Planting larger stock fertilization and added years of weed control are often employed to increase growth rate of plantations. We evaluated these techniques using a replicated factorial study design repeated in two diverse locations in western Washington State USA. Two different sizes of planting stock fertilizing at planting and in the following year and two or three years of weed control were tested. No significant interactions among the treatment levels were found with all treatments influencing Douglas-fir growth in an additive manner. Fourth year stem volume gains were greatest from planting larger initial stock planting seedlings 2 mm larger in basal diameter resulted in fourth-year stem volume gains of 35 and 43 . The fertilization treatments used produced early gains but they were short lived. The third-year weedcontrol treatment had no observable effect on fourth-year stem volume or on volume growth in years three or four. free-to-grow herbicide controlled-release fertilizer nutrition Résumé - Interaction du diamètre au collet initial des plants de la fertilisation et du contrôle de la vegetation concurrente avec la croissance du Douglas pendant les quatre années suivant la plantation. Pour accélérer la croissance des plantations on fait souvent appel à des techniques telles que l emploi de plants plus gros la fertilisation ou le contrôle de la végétation concurrente pendant plusieurs années. Nous avons évalué ces techniques au moyen de dispositifs factoriels avec répétitions installés dans deux stations de l ouest de l Etat de .

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