Open Access. Powered by Scholars. Published by Universities.®
Articles 1 - 3 of 3
Full-Text Articles in Life Sciences
Robust Relationships For Simple Plantation Growth Models Based On Sparse Data, Jerome K. Vanclay
Robust Relationships For Simple Plantation Growth Models Based On Sparse Data, Jerome K. Vanclay
Professor Jerome K Vanclay
Three equations predicting height H = β1(t − 0.5)0.5, diameter D = β2(H − 1.3)/ln N, and mortality dN/N = −2(G/Gmax)3dD/D from plantation age (t), stocking (N) and basal area (G) can be calibrated with few data (even a single observation) for plantations in which re-measured data and growth models are unavailable. Despite having only three parameters to be estimated, these equations extrapolate reliably and allow objective forecasts of future plantation growth performance that may serve as useful first approximations until more precise growth models can be developed.
Can Lessons From The Community Rainforest Reforestation Program In Eastern Australia Be Learned?, Jerome K. Vanclay
Can Lessons From The Community Rainforest Reforestation Program In Eastern Australia Be Learned?, Jerome K. Vanclay
Professor Jerome K Vanclay
The Community Rainforest Reforestation Program (1993-2000) was an attempt to create healthy vegetated catchments that maximize wood production, environmental protection and employment in eastern Australia. Despite a AUD10 million outlay, these goals were not fulfilled, because of limited resources and continually changing circumstances (goals, staff, institutions) that hampered the efforts of both researchers and coordinators. Both technical and managerial lessons need to be learned: blanket guidelines are rarely helpful because species, nutrition and silviculture need to be matched to each site; vigour, provenance and nutrition of nursery stock is critical to plantation success; health surveillance should not be overlooked; early …
Spiral And Interlocking Grain In Eucalyptus Dunnii, C Thinley, Graeme Palmer, Jerome K. Vanclay, Michael Henson
Spiral And Interlocking Grain In Eucalyptus Dunnii, C Thinley, Graeme Palmer, Jerome K. Vanclay, Michael Henson
Professor Jerome K Vanclay
Spiral grain in 181 trees from a 9-year-old plantationgrown Eucalyptus dunnii was normally distributed with mean −0.33 degrees (to the left) and standard deviation 1.7 degrees, and was affected by family and by crown asymmetry. Interlocking grain was common, exhibiting a mean amplitude of 3.4 degrees (standard deviation 1.5◦) and a mean wavelength of 39 mm (standard deviation 12 mm). The relatively large amplitude of interlocking grain means that most trees will have spiral grain that alternates between left and right during each year. The wavelength of interlocking grain is influenced by tree size, but amplitude of interlocking is under …