TAILIEUCHUNG - Báo cáo lâm nghiệp:"Root biomass distribution under three cover types in a patchy Pseudotsuga menziesii forest in western Canada"

Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí lâm nghiệp đề tài:"Root biomass distribution under three cover types in a patchy Pseudotsuga menziesii forest in western Canada" | Ann. For. Sci. 60 2003 469-474 INRA EDP Sciences 2003 DOI forest 2003040 469 Original article Root biomass distribution under three cover types in a patchy Pseudotsuga menziesii forest in western Canada Andrew D. RICHARDSONa Catherine Bealle STATLANDb Timothy G. GREGOIREa a School of Forestry Environmental Studies Yale University 370 Prospect Street New Haven CT 06511 USA b Research Branch British Columbia Ministry of Forests PO Box 9519 Stn. Prov. Govt. Victoria BC V8W 9C2 Canada Received 7 October 2002 accepted 21 March 2003 Abstract - We investigated the relationship between cover type and root biomass distribution and allocation to different root size classes in a naturally regenerated dry Rocky Mountain Douglas-fir Pseudotsuga menziesii var. glauca forest in the southern interior of British Columbia Canada. The site was selectively harvested 32 years previously residual stems were 30 cm and 130-170 years old at breast height at the time of study. A total of nine pits each measuring m X m were excavated to a depth of m under three different cover types mature timber grassy Calamagrostis rubescens openings canopy gaps and regeneration clumps. Total all diameters live root biomass ranged from kg m1 2 under the mature timber to kg m2 under both regeneration clumps and grassy openings. Thin root cm Ộ cm biomass was similar across all three cover types kg m2 . We suggest that the similarity of thin root biomass across the three cover types is indicative of strong root competition at this resource-poor site there appears to be no below-ground root gap corresponding to the canopy opening above the pinegrass-dominated patches. Calamagrostis rubescens Douglas-fir gap Pseudotsuga menziesii root biomass Résumé - Distribution de la biomasse racinaire sous trois types de couvert dans une forêt irrégulière de Pseudotsuga menziesii du Canada occidental. Nous avons étudié la relation entre le type de couvert et la repartition de la .

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