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.
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