TAILIEUCHUNG - Báo cáo lâm nghiệp: "Steep slopes promote downhill dispersal of Quercus crispula seeds and weaken the fine-scale genetic structure of seedling populations"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp Original article đề tài: Steep slopes promote downhill dispersal of Quercus crispula seeds and weaken the fine-scale genetic structure of seedling populations. | Ann. For. Sci. 64 2007 405-412 INRA EDP Sciences 2007 DOI forest 2007017 Available online at Original article Steep slopes promote downhill dispersal of Quercus crispula seeds and weaken the fine-scale genetic structure of seedling populations Takafumi OHSAWAa Yoshiaki TsUDAa b Yoko SAlTOa Haruo SAWADAc d Yuji IDEa a Department of Ecosystem Studies Graduate School of Agricultural and Life Sciences University of Tokyo Yayoi 1-1-1 Bunkyo-ku Tokyo 113-8657 Japan b Forestry and Forest Products Research Institute Matsunosato 1 Tsukuba-shi Ibaraki 305-8687 Japan c University Forest in Chichibu Graduate School of Agricultural and Life Sciences University of Tokyo Hinoda 1-1-49 Chichibu-shi Saitama 368-0034 Japan d University Forest in Aichi Graduate School of Agricultural and Life Sciences University of Tokyo Goizuka 11-44 Seto-shi Aichi 489-0031 Japan Received 26 June 2006 accepted 19 January 2007 Abstract - The seed dispersal patterns and genetic structure of plant populations in mountainous forests may differ from those on flat sites because some seeds that fall from adults are likely to roll downhill and thus cause the seed shadows from different mother trees to merge. In the study reported here we used six polymorphic microsatellite markers to track seed dispersal and examine the fine-scale spatial genetic structure of adults and first-year seedlings of Quercus crispula in 2500 m2 plots on four slopes. In each of the four plots leaves of adults seedlings and endocarps of hypogeal cotyledons attached to the seedlings were genotyped to identify the seedlings mother trees. The results showed that steeper slopes result in larger dispersions and smaller genetic structure of seedlings. These findings are a crucial step towards an understanding of the effect of topography on tree regeneration. genetic structure microsatellite marker Quercus crispula seed dispersal slope Résumé - Influence des pentes fortes sur la dispersion et la structure .

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