White pine, also known as Huashan pine or Wuxu pine. Perennial trees, reaching a height of up to 35 meters; The bark of young trees is gray green or light gray, smooth, while old trees appear gray and crack into squares; Branches spread flat, forming a conical or columnar tower shaped crown. Needle needles in bundles of 5, with fine serrations on the edges, and 4-8 white stomatal lines on each side of the ventral surface; The cross-section is triangular, and there are usually three resin channels. The flowering period is from April to May, and the cones mature from September to October of the following year.
Morphological characteristics
①. The white pine wood grain is straight, with uniform texture and moderate to coarse structure looseness;
②. White pine heartwood is milky white or light reddish brown, and its color darkens when exposed. The sapwood is pale yellow white;
③. The appearance of white pine is slightly white, similar to that of Chinese fir;
Growing Environment
White pine, also known as Huashan pine or Wuxu pine, can be planted in the hilly areas of Qinba Mountain and Weibei. The annual average temperature should be below 15 ℃, and the annual precipitation should be between 600-1500 millimeters. Good adaptability to soil, can grow on mountainous brown soil, red yellow soil, and red calcareous soil. But it has strict requirements for soil moisture and is not tolerant to drought and barrenness, let alone salt alkali and poor drainage. Huashan pine is relatively cold resistant and can grow normally at low temperatures of -7 to -10 ℃, and can also grow at low temperatures of -31 ℃.
Physical properties
1. The material is light, soft, and has moderate toughness;
2. Low strength and seismic performance, with moderate to low corrosion resistance;
3. Good durability, not easily warped or deformed;
machinability
When using manual or mechanical tools for general machining such as turning and planing, the performance is very good;
2. Excellent steam bending performance;
3. Good adhesive performance; The performance of nailing and tenoning is very good, and there is no need to fill the pores with fillers beforehand;
4. The surface treatment performance such as coloring is good, but uneven absorption spots may appear during coloring;