三種類型的樹夾皮

三種類型的樹夾皮

A 嵌入式 : 樹皮完全被木質部所包圍，樹皮被塞在接合處。

B 杯形 : 樹皮週圍形成邊材，分叉的頂點為兩處邊材。

C 寬口形 : 樹皮在分叉的頂點處有相當大的寬度。

Figure 6.3: Three types of bark-included bifurcation found in hazel trees (yz plane view of internal structure)

Diagrams and images defining three morphological types of bark-included junctions in hazel, based on observations of the fracture surfaces of such bifurcations perpendicular to the plane of the bifurcation.

A: Embedded bark is surrounded entirely by xylem, the bark having been occluded into the junction.

B: A cup-shaped bark inclusion has sapwood formed around included bark which lies at the centre of the join – there is sapwood at the apex of the bifurcation rather than bark.

C: A wide-mouthed bark inclusion has a substantial width of included bark at the apex of the bifurcation, situated above any connecting sapwood.