Sasa

Article

July 5, 2022

Sasa (sasa, shino, culm, culm, kotake) is a general term for plants belonging to the subfamily Bambusoideae, which remains until the leaf sheath surrounding the culm, which is the stem of the plant, dies.

Definition

Sasa is a monocotyledonous plant belonging to the subfamily Bambusoideae (sometimes referred to as Bambusoideae). Like many herbs, bamboo and bamboo grass do not have annual rings on the culm, which is the stem, but on the other hand, they have the property of becoming stiff like woody plants. In botanical terms, among the grass subfamily Bambusoideae, bamboo refers to those in which the culm grows and the leaf pods that surround it fall off quickly, and Sasa refers to those in which the culm remains until it withers. In the case of bamboo shoots such as Madake, the leaf sheath that was in the bud (bamboo shoot) stage peels off when it grows, but in the case of Sasa, the leaf sheath remains as it is even if it grows. The classification of bamboo and bamboo grass does not always match the standard Japanese name. In terms of classification, Yadake is classified as bamboo because the skin is still attached to the culm, and Sasa and Okamezasa are classified as bamboo because the skin is shed.

Growing environment

Extend the stolons underground to create a dense community. When it grows on one side, it is called Sasahara. There are several patterns in Japan as conditions for the growth of bamboo grass. One is when it behaves as a pioneer plant. Nezasa often appear around rivers and roadsides. This is because it is resistant to irregular disturbances caused by mowing and flooding of rivers. In cold regions, Sasa becomes dominant vegetation in deforestation and wildfire sites, which often hinders the renewal of woody trees and makes them non-standing trees. In order to break the dominance of Sasa, a bulldozer or the like may be used to artificially scrape the soil to expose the mineral soil to create an environment suitable for the settlement of tree seedlings. The other is undergrowth in beech forests, and in Japanese beech forests, there are many cases where bamboo grasses dominate the forest floor. The species varies from region to region, and is often Sasa kurilensis on the Pacific Ocean side and Sasa kurilensis on the Sea of ​​Japan side. Sasa becomes a bush if left unattended, but from the viewpoint of biodiversity, it is a hideout for small animals and a herb for insects. On the other hand, the overgrowth of Sasa also absorbs water from the ground to dry the soil, and blocks sunlight to prevent photosynthesis of other plants. In particular, the land becomes dry due to the early melting of snow due to global warming, threatening alpine plant communities suitable for moist environments in Hokkaido's Daisetsuzan National Park, Rebun Island, Hiragatake, Tateyama, Hakusan, etc. In some areas, attempts are being made to protect alpine plants by cutting bamboo grass.

Classification

There are so many species. Compared to most Japanese bamboos that came to China, bamboo grasses have many indigenous species and many local variations. Pleioblastus: Kanzanchiku, Ryukyuchiku, Taiminchiku, Kenezasa, Kamurozasa, Gokitake, Akanezasa, Giboushino, Hakonedake, Azmanezasa, Medake Arundinaria: Arundinaria, Arundinaria, Arundinaria, Arundinaria, Arundinaria, Tangoshinochiku, Yabuzasa, Arundinaria Sasa: ​​Sasa: ​​Miyakozasa, Unzenzasa, Okumazasa, Nikkozasa, Apoizasa, Kumazasa, Osasa, Oobazasa, Miyamazasa, Chimakizasa, Kumaizasa, Chishimazasa, Okuyamazasa, Ibukizasa, Tokugawazasa Genus Sasamorpha: Suzutake, Kesuzu Yadake genus Pseudosasa: Yadake, Yakushimadake Genus Inyouchiku × Hibanobambusa