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.

中文翻译：

---

立地对人工林孔雀松树形、木材特性和木材质量的影响

南非是一个水资源匮乏的国家，天然森林极少。人工林树种，如墨西哥热带硬松、孔雀松席德和德佩前任施莱特。＆湛。,引入该国以满足当地纤维需求。如今，南非的大部分松树种植园都位于普马兰加省。该省的气候和土壤特性具有不同的生长条件。样地设置在同龄孔雀草种植园并根据土壤母质和海拔进行分层。根据气候和土壤特性对每个样地的生长条件进行了表征。总共测量了 540 棵样本树的高度、直径、密度和晚材含量。样树被采伐，产生了 2690 根原木。对原木进行铣削，并根据密度、动态弹性模量和断裂模量对所得木材进行分级。年最高气温对树木生长的影响最为显着，而降雨量则与立木密度和晚材含量相关。然而，年最高气温和树高与恢复的木材性能和尺寸稳定性呈负相关。春季降雨似乎是影响木材扭曲的最重要因素，这可能是由于树木中存在较大的幼年核心。