• Source: Pinus thunbergii

Pinus thunbergii (syn: Pinus thunbergiana), the black pine, Japanese black pine, or Japanese pine, is a pine tree native to coastal areas of Japan (Kyūshū, Shikoku and Honshū) and South Korea.
It is called gomsol (곰솔) in Korean, hēisōng (黑松) in Chinese, and kuromatsu (黒松) in Japanese.




Description


Black pines can reach the height of 40 metres (130 feet), but rarely achieves this size outside its natural range. The needles are in fascicles of two with a white sheath at the base, 7–12 centimetres (2+3⁄4–4+3⁄4 inches) long. Female cones are 4–7 cm (1+1⁄2–2+3⁄4 in) in length, scaled, with small points on the tips of the scales, taking two years to mature. Male cones are 1–2 cm (1⁄2–3⁄4 in) long borne in clumps of 12–20 on the tips of the spring growth. The bark is gray on young trees and small branches, changing to black and plated on larger branches and the trunk; becoming quite thick on older trunks. It is a widely adapted plant with attractive dark green foliage.




Ecology


In North America this tree is subject to widespread mortality by the native American pinewood nematode, Bursaphelenchus xylophilus, spread by means of beetle vectors. Subsequently, blue stain fungus invades the plant, leading to a rapid decline and death. This nematode has also been introduced to Japan accidentally, leading to the species becoming endangered in its native area.




Uses


Because of its resistance to pollution and salt, it is a popular horticultural tree. In Japan it is widely used as a garden tree, both trained as niwaki and untrained growing as an overstory tree. The trunks and branches are trained from a young age to be elegant and interesting to view. It is one of the classic bonsai subjects, requiring great patience over many years to train properly.




Second flush of growth


One characteristic of the Japanese black pine that makes it desirable for bonsai, is the possibility of inducing a second flush of new growth and improved ramification in a single growing season. Unlike most pines, which are single flush plants, the Japanese black pine can be induced to produce new buds at the base of each spring candle by simply cutting the candles at the base as they elongate, a technique called decandling. This technique will result, in a few weeks, in the flush of multiple new buds at the base of the cut candle; each of these new buds will result in turn in new candles and branches.




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References






Further reading


Fu, Liguo; Li, Nan; Elias, Thomas S.; Mill, Robert R. "Pinus thunbergii". Flora of China. Vol. 4. Retrieved 2018-08-16 – via eFloras.org, Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.




External links



Conifers Around the World: Pinus thunbergii - Japanese Black Pine

Kata Kunci Pencarian:

• Tusam (umum)
• Pinus di Denmark
• Margasatwa Jepang
• Prefektur Shimane
• Assabu, Hokkaido
• Mihama, Aichi
• Mihama, Mie
• Hioki, Kagoshima
• Miyazu, Kyōto
• Tokoname, Aichi
• Pinus thunbergii
• List of Pinus species
• Black pine
• Japanese pine
• List of plants by common name
• Pine
• Wildlife of Japan
• Gunma Prefecture
• Nosaka, Chiba
• Carl Peter Thunberg