论文部分内容阅读
杉木是我国南方最重要的速生用材树种。它的地理分布遍及整个亚热带地区。分布区涉及湖南、福建、江西、贵州、浙江、广东、广西、四川、湖北、云南、安徽、江苏、河南、陕西、甘肃及台湾等16省区。建国以来,特别是近十年来,栽杉范围又有新的扩大,甚至地处暖温带的山东昆嵛山、江苏、苏北平原,以及热带范围的广东海南岛尖峰岭等地也有少量引种试种。由于各产区的气候、土壤条件的差异,杉木的生长速度、单位面积生长量、成材年限及规格都有显著差别。为此根据杉木地理分布区的自然条件,生长状况,对我国杉木产区作出区划。并初步评价它们的生产潜力和提出规划主要商品材基地的建议,显然是有益的。此外杉木种源及品种类型的选择,杉木栽培措施的制定,也应以区划作为依据;杉木立地指数表的编制,杉木立地条件类型的划分,也要以区划作为基础。
Chinese fir is the most important species of fast-growing timber in southern China. Its geographical distribution throughout the subtropical region. The distribution area covers 16 provinces and autonomous regions such as Hunan, Fujian, Jiangxi, Guizhou, Zhejiang, Guangdong, Guangxi, Sichuan, Hubei, Yunnan, Anhui, Jiangsu, Henan, Shaanxi, Gansu and Taiwan. Since the founding of the People’s Republic of China, there has been a new expansion of the range of spruce-fir trees, especially in the Kunlun Mountains in Shandong Province, Jiangsu Province and the Northern Jiangsu Plain in the warm temperate zone, and Jianfengling of Hainan Island in the tropics. Species. Due to the different climatic and soil conditions in the producing areas, there are significant differences in the growth rate, the growth amount per unit area, the useful life and the specifications of Chinese fir. Therefore, according to the natural conditions and the growth of the geographical distribution area of Cunninghamia lanceolata, the division of the Cunninghamia lanceolata area in China is made. It is clearly useful to first assess their potential for production and to propose a plan for major commodity timber bases. In addition, the choice of provenance sources and types of Chinese fir and the establishment of fir cultivation measures should also be based on zonation. The establishment of the site index table of Chinese fir and the classification of the site types of Chinese fir must also be based on the division.