Jaco-Pierre van der Merwe, Martin Bacher, Sechaba Madiope, Thandekile Ncongwane, Robert Ngomane, Olwethu Spogter, Hilton Kuisis, Jaco Potgieter, Oscar Tait, Charlie Clarke, Julie Cool, Stavros Avramidis, Simon Ellis, Shawn D. Mansfield
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引用次数: 0
摘要
南非是一个缺水国家,天然森林极少。为了满足当地的纤维需求,该国引进了墨西哥热带硬松(Pinus patula Schiede & Deppe ex Schltdl.如今,南非大部分的松树种植园都位于姆普马兰加省。该省的气候和土壤条件各不相同。我们在树龄均匀的 P. patula 人工林中建立了样地,并根据土壤母质和海拔高度进行了分层。根据气候和土壤特性对每个样地的生长条件进行了描述。共测量了 540 棵样树的高度、直径、密度和晚材含量。样本树被采伐后产生了 2690 根原木。原木经过碾磨后,根据密度、动态弹性模量和断裂模数对木材进行分级。年最高气温对树木生长的影响最大,而降雨量则与立木的木材密度和晚材含量相关。然而,年最高气温和树高与木材的恢复特性和尺寸稳定性呈负相关。春季降雨似乎是影响木材捻度的最重要因素,这可能是由于树木中存在较大的幼核。
The impact of site on tree form, wood properties, and lumber quality of plantation-grown Pinus patula
South Africa is a water scarce country with minimal natural forests. Plantation forest species such as the Mexican tropical hard pine, Pinus patula Schiede & Deppe ex Schltdl. & Cham., was introduced into the country to satisfy local fibre demand. Today, the majority of pine plantations in South Africa are found in the Mpumalanga province. The province has diverse growing conditions in relation to climate and soil properties. Sample plots were established in even-aged P. patula plantations and stratified according to soil parent material and altitude. Growing conditions of each sample plot were characterised according to climate and soil properties. A total of 540 sample trees were measured for height, diameter, density, and latewood content. The sample trees were harvested to produce 2690 logs. The logs were milled, and the resultant lumber was graded according to density, dynamic modulus of elasticity, and modulus of rupture. Annual maximum temperature had the most significant impact on tree growth, while rainfall correlated with wood density and latewood content of standing trees. However, annual maximum temperature and tree height had a negative relationship with the recovered lumber properties and dimensional stability. Spring rainfall appeared to be the most important factor influencing lumber twist and this was possibly due to the associated larger juvenile core present in the trees.
期刊介绍:
Holzforschung is an international scholarly journal that publishes cutting-edge research on the biology, chemistry, physics and technology of wood and wood components. High quality papers about biotechnology and tree genetics are also welcome. Rated year after year as one of the top scientific journals in the category of Pulp and Paper (ISI Journal Citation Index), Holzforschung represents innovative, high quality basic and applied research. The German title reflects the journal''s origins in a long scientific tradition, but all articles are published in English to stimulate and promote cooperation between experts all over the world. Ahead-of-print publishing ensures fastest possible knowledge transfer.