TAILIEUCHUNG - Báo cáo khao học: "Sap flow and water transfer in the Garonne River riparian woodland, France: first results on poplar and willow"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài: Sap flow and water transfer in the Garonne River riparian woodland, France: first results on poplar and willow. | Ann. For. Sci. 59 2002 301-315 INRA EDP Sciences 2002 DOI forest 2002026 301 Original article Sap flow and water transfer in the Garonne River riparian woodland France first results on poplar and willow Luc Lambs and Étienne Muller Centre d Ecologie des Systèmes Aquatiques Continentaux CESAC 29 rue Marvig 31055 Toulouse Cedex 5 France Received 15 January 2001 accepted 13 November 2001 Abstract - This work is the first attempt at using Granier sap sensors on Populus nigra Populus x euramericana cv I45 51 and Salix alba for the monitoring of sap flows in an active floodplain over two consecutive years. The main characteristic of these diffuse porous trees is their capacity to use several tree rings for xylem sap transfer. Results showed that the sap flux densities remained homogeneous on the external 4 cm of the trunk then decreased with depth. For young trees the active sapwood can represent half of the trunk. Results indicated that in the same environment and at the same age daily differences existed between the two major native riparian tree species the black poplar and the white willow. Their maximal sap flux density dm3 dm-2 h-1 was similar to other fast growing trees. The influence of age was the third important screened factor. Sap flow measurements over several months indicated that water uptake was variable throughout the season depending on water availability and was more pronounced for older trees. The sap flux densities for the planted poplar I45 51 ranged from dm3 dm-2 h-1 about 90 dm3 day-1 in the wetter spring conditions and dropped to dm3 dm-2h-1 about 60 dm3 day-1 in less favourable conditions. Under the worst conditions . the especially long drought in the summer of 1998 these values dropped to about 40 dm3 day-1 and even to dm3 dm-2h-1 about 12 dm3 day-1 for a few days. Complementary long-term studies are needed to better understand the complex sap flow changes and to be able to relate them to .

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