tailieunhanh - Báo cáo lâm nghiệp: "Litterfall dynamics after a typhoon disturbance in a Castanopsis cuspidata coppice, southwestern Japan"

Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí lâm nghiệp đề tài: Litterfall dynamics after a typhoon disturbance in a Castanopsis cuspidata coppice, southwestern Japan. | Ann. For. Sci. 61 2004 431-438 INRA EDP Sciences 2004 DOI forest 2004036 431 Original article Litterfall dynamics after a typhoon disturbance in a Castanopsis cuspidata coppice southwestern Japan Tamotsu SATOa b a Kyushu Research Center Forestry and Forest Products Research Institute FFPRI 4-11-16 Kurokami Kumamoto Kumamoto 860-0862 Japan b Present address Department of Forest Vegetation Forestry and Forest Products Research Institute FFPRI PO Box 16 Tsukuba Norin Tsukuba Ibaraki 305-8687 Japan Received 11 April 2003 accepted 3 September 2003 Abstract - Litterfall was measured for eight years 1991-1998 in a Castanopsis cuspidata coppice forest in southwestern Japan. An extraordinarily strong typhoon T9119 hit a study site in September 1991 and caused defoliation. The mean annual total litterfall was t-ha-1 but annual variations maximum-minimum ratio were very large throughout the observation period. The high ratio of annual fluctuation can probably be explained by a combination of coppice stand structure and presence of typhoon disturbance. The leaf litterfall formed the bulk of total litterfall and showed bimodal peak leaf abscission in spring April-May and facultative peak in late summer July-September . Small wood less than 2 cm in diameter input were associated with typhoon disturbances and showed no clear seasonality. Over the 7 years period following T9119 annual leaf input had recovered to 94 of pre-disturbance values. The recovery of leaf litterfall would be achieved with releafing of typhoon survivors. Castanopsis cuspidata litterfall typhoon disturbance coppice recovery Résumé - La dynamique de la chute de litière après une perturbation tourbillonnaire dans un taillis de Castanopsis cuspidata dans le sud-ouest du Japon. La chute de litière a été mesurée pendant huit années 1991-1998 dans une forêt de taillis de Castanopsis cuspidata dans le sud-ouest du Japon. Un typhon d une force extraordinaire T9119 s est abattu sur notre site d étude .