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杉木是我区乡土树种之一,生长快,材质好,在海拔400—1700米之间广有栽培。在1981—1984年全区新造的速生丰产用材林中,杉木面积已达13万亩。 影响杉木生长有气候、土壤、植被、地形、地貌等多种因素,但据省内多年对杉木研究的结果表明,下川东盆周山地林木生长的主要限制因子是气温和水湿条件,而气温、水湿条件、土壤、植被等又与海拔高度有着十分密切的关系,常随海拔的梯度变化而发生规律性的变化。因此,本文试以在大巴山、七曜山、铁峰山、南山、方斗山等地700—1700米海拔区域内,不同立地条件下调查的52个杉木中龄林人工林样地资料,以海拔分组,分析研究海拔梯度、气候条件与杉木生长水平之间的关系,探讨杉木速生丰产林的适生海拔区域,为我区杉木栽培的规划布局和生产指导提供依据。
Chinese fir is one of the native tree species, growing fast, good material, widely cultivated in the 400-1700 meters above sea level. In 1981-1984 the region’s new-made fast-growing high-yield timber, fir area has reached 13 million mu. Cunninghamia lanceolata affects many factors such as climate, soil, vegetation, topography and geomorphology. However, according to many years’ research on Chinese fir in the province, the main limiting factor of forest growth in the mountainous area of Xiachuandong basin is the temperature and water wet conditions, while the temperature , Wet conditions, soil, vegetation and so on and altitude have a very close relationship, often with the elevation gradient changes occur regularly. Therefore, in this paper, the data of 52 Chinese fir plantations of mid-aged Chinese fir forest surveyed under different site conditions in the altitudes of 700-1700 m above sea level in Daba Mountain, Qi Yao Mountain, Tiefeng Mountain, Nanshan Mountain and Fangdo Mountain are divided into three groups , Analyzed the relationship between altitude gradient and climatic conditions and the growth of Chinese fir, and explored the adaptive altitude of fast growing Chinese fir plantation, which provided the basis for the planning, layout and production guidance of Cunninghamia lanceolata in our district.