TAILIEUCHUNG - Báo cáo lâm nghiệp: "Carbon and nitrogen winter storage and remobilisation during seasonal flush growth in two-year-old cork oak (Quercus suber L.) saplings"

Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí lâm nghiệp đề tài: Carbon and nitrogen winter storage and remobilisation during seasonal flush growth in two-year-old cork oak (Quercus suber L.) saplings. | Ann. For. Sci. 61 2004 721-729 INRA EDP Sciences 2004 DOI forest 2004058 721 Original article Carbon and nitrogen winter storage and remobilisation during seasonal flush growth in two-year-old cork oak Quercus suber L. saplings Sofia CERASOLIa b Pascale MAILLARDc Andrea SCARTAZZAd Enrico BRUGNOLId Maria Manuela CHAVESa b João Santos PEREIRAa a Instituto Superior de Agronomia Tapada da Ajuda 1349-017 Lisbon Portugal b Instituto de Tecnologia Química e Biológica Aptd. 12 2781-901 Oeiras Portugal c UMR INRA-Université Henri Poincaré Écologie et Écophysiologie Forestières INRA Centre de Nancy 54280 Champenoux France d Consiglio Nazionale delle Ricerche Istituto de Biologia Agroambientale e Forestale Via Guglielmo Marconi 2 Villa Paolina 05010 Porano TR Italy Received 1 April 2003 accepted 20 August 2003 Abstract - A dual long-term 13C and 15N labeling was used to assess the contribution of winter assimilated carbon C and nitrogen N for the spring growth flush of two-year-old cork oak plants. Changes in concentrations and partitioning of winter assimilated C and N total C and N and total-non-structural carbohydrates were followed from January to August in the various plant parts first year and second year leaves stem branches coarse and fine roots . No loss of winter C and N was observed with time suggesting that winter assimilates are retained within the plant and contribute to storage. A strong mobilisation of C and N was demonstrated from first year leaves and fine roots during the spring growth flush. Leaves from the second year and to lesser extent branches acted as sinks for winter C and N. At the beginning of the new leaf growth a significant decrease in starch concentration occurred in first year leaves. In August before leaf fall we observed also a mobilisation from first year to second year leaves of N assimilated after labeling. We conclude that under these experimental conditions both winter and current C and N were used for the spring growth flush .

• Báo cáo khoa học
• Báo cáo lâm nghiệp hay
• cách trình bày báo cáo
• báo cáo lâm nghiệp
• công trình nghiên cứu lâm nghiệp
• tài liệu về lâm nghiệp