立地条件和林分结构对有林地生产力的影响

Effects of Site Conditions and Stand Structure on Productivity of Forest Land

通过分析有林地生产力与立地条件和林分结构中各因子的关系,探索制约有林地生产力的主要因素。结果表明:不同立地质量中I类地单位蓄积量最高(268.86±20.24 m3/hm2),不同坡向中东坡单位蓄积量最高(269.78±38.54 m3/hm2),不同树种组成中10杉类型单位蓄积量最高(259.33±14.62 m3/hm2);有林地生产力与林分年龄、林分密度正相关,相关系数R分别为0.590、0.460;有林地生产力与海拔、坡度相关性不显著。以上结果说明立地质量、坡向和树种组成对有林地生产力影响显著;有林地生产力与林分年龄、林分密度相关,与海拔、坡度无关。

Through analyzing correlationship between forest land productivity and site conditions, stand structure, the main factors restricting forest land productivity were explored. The results showed that I site levels had the maximum stand volume with （268.86± 20.24）m^3/hm^2 in different site quality, the east slope had the maximum stand volume with （269.78 ± 38.54） m^3/hm^2 in different slope directions, Chinese fir plantation had the maximum stand volume with （259.33 ±14.62 ） m^3/hm^2 in different tree species composiyion; Significant correlation was found between productivity of forest land and stand age （ R = 0. 590）, stand density （ R = 0. 460）, but not with altitude and slop. These results implicated that the productivity of forest land were affected by site conditions, slope and stand structure significantly.