Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài: "A new data processing system for root growth and ramification analysis: description of methods. | 305s Ann. Sci. For. 1989 46 suppl. 305s-309s Forest Tree Physiology E. Dreyer et al. eds. Elsevier INRA A new data processing system for root growth and ramification analysis description of methods M. Colin-Belgrand1 H. Joannes2 E. Dreyer2 and L. Pages4 1 Laboratoire des Sols et de la Nutrition des Arbres Forestiers 2 Station de Biométrie and 3 Laboratoire de Biocllmatologie et d Ecophysiologie Forestiere INRA Centre de Recherches Forestieres BP 35 54280 Seichamps and 4 Station d Agronomie INRA Centre dAvignon Domaine-de-Saint-Paul 84000 Montfavet France Introduction Direct observation of root growth in woody seedlings is possible using a minirhizotron . Root growth in this device occurs almost exclusively at the interface between the substrate and the lower transparent rhizotron wall. This method provides a better picture of root morphology and development but reduces a threedimensional root system to a plane. Root growth is generally observed every 2nd day newly formed roots are traced on a transparent polyethylene sheet with a different color ink for each date. Previous studies of root system characteristics required time consuming manual processing. To overcome this major limitation we have recently developed a semiautomated data acquisition system allowing a quantitative analysis of root architecture Belgrand et al. 1987 . This new data processing system consists of 3 successive stages 1 semi-automated data acquisition 2 data storage and growth parameter computation and 3 the integration of the computed parameters into a developmental model Pages and Aries 1988 . The technical prerequisites of this processing system are described below. Data acquisition system Basic principles for analyzing structural features of root pictures are the following 1 a root is defined as a linear unbranched structure formed through the activity of a single apical meristem 2 successive root orders are defined according to a developmental terminology Rose 1983 the taproot .
