tailieunhanh - Báo cáo lâm nghiệp: " Compatible stem taper and stem volume functions for oak (Quercus robur L and Q petraea (Matt) Liebl) in Denmark"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế, đề tài: Compatible stem taper and stem volume functions for oak (Quercus robur L and Q petraea (Matt) Liebl) in Denmark. | Ann Sci For 1997 54 577-595 Elsevier Inra 577 Original article Compatible stem taper and stem volume functions for oak Quercus robur L and Qpetraea Matt Liebl in Denmark MJ Tarp-Johansen JP Skovsgaard1 SF Madsen VK Johannsen I Skovgaard2 1 Danish Forest and Landscape Research Institute Department of Forestry Hdrsholm Kongevej DK-2070 Hprsholm 2 Royal Veterinary and Agricultural University Department of Mathematics and Physics Thorvaldsensvej 40 DK-1871 Frederiksberg c Denmark Received 5 April 1996 accepted 17 March 1997 Summary - In this paper we develop compatible stem taper and stem volume functions for oak Quercus robur L and Q petraea Matt Liebl in Denmark. In the compatible system of stem taper and volume functions the solid of revolution of the stem taper equation equals the volume according to the total stem volume function. The stem volume is explicitly expressed in the stem taper function. Thus it is possible to adjust estimates of the stem taper curve to a specific stand volume level and thereby accounting for the effect of silvicultural practice on stem taper . The accuracy of predictions from the stem volume function for oak is comparable to similar functions for three broadleaved species and six conifers. Comparable stem taper functions for other broadleaved species are not available but compared to conifers the stem taper function for oak performs relatively well considering the substantial number of forked oak trees. stem taper stem volume oak Quercus robur Quercus petraea Resume - Système compatible d equations de defilement et de tarif de cubage pour les chênes au Danemark. Dans cet article nous développons des equations de defilement et des tarifs de cubage compatibles pour les chênes Quercus robur L et Q petraea Matt Liebl au Danemark. Dans ce système coherent le solide de revolution engendré par requation de defilement a le même volume que celui fourni par le tarif de cubage de la tige. Le volume du tarif de cubage est exprimé explicitement à .