![]() For instance, in Huanghu County, Hubei Province, its average height was 9.5 m and its average breast diameter was 10.5 cm when it reached seven years of age. Recently, thanks to intensive cultivation, it has grown even faster than before. The growing pattern in some areas in southern China indicates that, under ordinary planting conditions, it can grow into matured timber in about 15-20 years. This shows its characteristics of quick growth and high yield. In the introduced areas, the highest value of its continuous height and breast-diameter development appeared even earlier and the absolute value was also greater. The leading shoots of the continuous height growth (1.43 m) appeared when it was 10- 15 years old and the leading shoots of the continuous breast-diameter expanse (2.1 cm) appeared when it was 20-25 years old. In its provenance its average annual vertical growth is 30-80 cm and its average annual breast diameter expanse is 1 - 1.75 cm. Quick growth is one of the main advantages of the Metasequoia. The best results were obtained when it was introduced to alluvial soil on plains and beside rivers, and to wetter foothills where slopes are gentle. Its distribution in its original location is at an altitude of between 900 and 1 500 m, but chiefly at one of 1 050 m. It can grow on light saline and alkaline land (salinity below 0.2 percent). It also adapts well to dry climates if there Is irrigation during the very dry season, but sustained dryness will kill It. It thrives equally well in areas where annual precipitation is 1000 mm. Even in northwestĬhina, along the Wei River valley, where the absolute lowest temperature is 18.7☌, and in the Lüda area in northeast China, where the minimum winter temperature is 19☌, it survives and grows. It grows well in areas where the annual average temperature is about 12° -20☌. The range of its adaptation to climatic conditions is broad. The Metasequoia is a large deciduous tree which can reach 37 m in height and 2.2 m in breast diameter. Very few species are so adaptable that they can be introduced in such a variety of areas. In high-latitude areas such as Leningrad, Copenhagen and Alaska, for example, it can grow even in winter, at sub-zero temperatures. Since 1948, it has been planted throughout the country and has been introduced in more than 50 countries in Asia, Africa, Europe and America where it grows very well. It is an excellent species for afforestation, and the planting of Metasequoia in quantity could play an important role in fuming the land green, increasing timber output and beautifying the environment. Its straight and full-boled stems indicate a fine qualify timber which can be used to make paper, as well as in construction and in making furniture and farm tools. This species of Metasequoia has strong adaptability and is quick-growing. To commemorate this discovery, the species was given the name "living fossil" in scientific circles. They identified the species by its fossil, one of the 10 fossils corresponding to the 10 tree species of the Metasequoia genus known to scientists up to now. glyptostroboides in Lichuan County, in Hubei Province. In the 1940s, two Chinese scientists, Hu Shian Sou and Cheng Wan Chun, discovered the M. Nobody knew that in a remote comer of China people had kept and propagated it. This old and rare tree species was thought, until recently to be extinct. There exists in the world a living fossil tree - the Metasequoia glyptostroboides (dawn redwood), native to China.143 - Forestry extension, making it work - China - Metasequoia: the national fossil treeĬhina - Metasequoia: the national fossil treeĬHINA'S "FOSSIL TREE" once thought extinct - now a bright future (CHAO CHIU JU)Ī METASEQUOIA SEEMING growth potential of more than 35 metres (JOHN KUSER)
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |