tailieunhanh - Báo cáo lâm nghiệp: "Predicting site productivity and pest hazard in lodgepole pine using biogeoclimatic system and geographic variables in British Columbia"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp Original article đề tài: "Predicting site productivity and pest hazard in lodgepole pine using biogeoclimatic system and geographic variables in British Columbia" | Ann. For. Sci. 62 2005 31-42 INRA EDP Sciences 2005 DOI forest 2004089 31 Original article Predicting site productivity and pest hazard in lodgepole pine using biogeoclimatic system and geographic variables in British Columbia Harry X. WUa Cheng C. YlNGb Hong-Bo JUc a PO Box E4008 Kingston Canberra ACT 2604 Australia b Research Branch BC Ministry of Forests 712 Yates Street Victoria British Columbia V8W 3E7 Canada c Heilongjiang General Bureau of Forest Industry Harbin China Received 18 March 2003 accepted 19 April 2004 Abstract - A series of 60 lodgepole pine provenance tests was planted throughout the interior of British Columbia in 1974 to predict productivity and pest hazard based on ecological classification and geographical variables. These 60 tests cover eight biogeoclimatic zones and 25 subzones within the biogeoclimatic ecosystem classification BEC in British Columbia. Ten provenances are common among 60 provenances tested at each site. Mean height 20-year was measured at 57 of the 60 sites incidence of western gall rust assessed at 56 sites terminal weevil at 49 sites and needle cast at 50 sites. There is large site-to-site variation in all traits. Geographic models using latitude longitude and elevation of test site location as predictors explained 47 35 33 27 and 8 of site variation for height survival incidence of needle cast terminal weevil and western gall rust respectively. BEC zones accounted for about the same amount of the site variation as geographic models suggesting both accounted for the effect of site environments relating mainly to temperature and precipitation. Within BEC zones site variation in height seems to be related to subzones associated with moisture gradient but not temperature. Sites in the moist mild ICH subzone and the dry cool MS subzone along the southern Rocky Mt. Trench represent the best forest land for intensive silviculture of lodgepole pine being highly productive with low pest hazard except needle cast. These .