tailieunhanh - Báo cáo khoa học: " Spatial variability of humus forms in some coastal forest ecosystems of British Columbia"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài: " Spatial variability of humus forms in some coastal forest ecosystems of British Columbia. | Ann Sci For 1995 52 653-666 Elsevier INRA 653 Original article Spatial variability of humus forms in some coastal forest ecosystems of British Columbia H Qian K Klinka Forest Sciences Department University of British Columbia Vancouver BC Canada V6T 1Z4 Received 1 February 1994 accepted 19 June 1995 Summary The spatial variability of 5 humus form properties thickness acidity total c total N and mineralizable-N was examined in 3 coastal forest sites of different tree species composition western hemlock Douglas-fir and western redcedar humus forms and ecological site quality using variogram and kriging. Humus form properties were found spatially dependent and the kriging interpolation between sample locations unbiased for all 5 properties and in all 3 sites. The overall range of spatial dependence ranged from 46 to 1 251 cm but varied with property and site. The average range for the humus form properties increased from 109 cm total N to 704 cm mineralizable-N and that for the sites increased from 275 cm western hemlock to 581 cm Douglas-fir . It appears that humus forms in each site occur in polygons with the lateral dimension ranging from 100 to 700 cm. The spatial pattern of each property in each site was portrayed in contour maps. humus form spatial variability variogram kriging Resume Variabilité spatiale des types d humus dans quelques écosystèmes forestiers côtiers de Colombie britannique. La variabilité spatiale de 5 caractérístiques de I humus épaisseur aci-dité carbone total azote total et mineralisable a été étudiée dans 3 sites forestiers côtiers differant par I espece dominante pruche de I Ouest douglas et thuya géant le type d humus et le type de station. Elie est analysée par variogramme et krigeage. Ces propriétés des types d humus sont dépen-dantes spatialement et interpolation par krigeage entre les points d echantillonnage est non biaisée pour les 5 propriétés et les 3 sites. La portée globale de dependance spatiale varie de 46 à 1 251 cm mais .