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杨树是我国低山丘陵半干旱区河滩地重要的防护用材林树种之一,探讨其生长量与气候因子的定量关系,可为该地区河滩地杨树防护用材林集约栽培及其低产林的更新改造提供科学依据。本文以该地区大、小凌河两岸河滩地为典型试验区,经多年连续观测,通过林木调查和树干解析,应用多元逐步回归和灰色系统理论与方法,建立了杨树生态防护用材林高生长量与气候环境因子的回归模型,气候环境因子对其生长量影响程度的灰色关联顺序为光>水>气>热,即可认为影响杨树高生长的主导因子是光照因子,其次是水分因子,再次是热量因子。表2参17。
Poplar is one of the important timber species for protection in floodplain in the semi-arid hilly region of China, and the quantitative relationship between its growth and climatic factors may be explored. It can be used for the intensive cultivation of poplar protective timber in floodplain and the regeneration of low-yield forest Provide a scientific basis. Based on the continuous observation over many years, through forest investigation and tree trunk analysis, applying the multiple stepwise regression and the gray system theory and method, this paper established a model experimental area of floodplain on both sides of Xiaolinghe and Xiaolinghe, And the regression model of climatic and environmental factors, the order of the gray relation of climatic and environmental factors affecting their growth is light> water> gas> heat, and the dominant factor that affects poplar height growth is light factor, followed by water factor and again Thermal Factor. Table 2 Reference 17.