【摘要】 通过在石岩寨林场666 67hm2华山松林中选取29块样地,实测9组不同径阶树高、冠幅及枝下高数据,利用营养面积技术,建立树冠面积与立木胸径的回归方程,确定不同径阶应保留的标准密度,间伐强度蓄积为40 1%,间伐强度株数为39 98%,间伐蓄积为51359m3,出材量32330m3。更多还原

【Abstract】 Twenty-nine sample plots in 666.67 hm² of XPinus armandii at Shiyanzhai Forest Farm were selected out for studying the application of nutrition area control on tending felling. Nine groups of data including tree height, crown width and height under branch on different diameter classes were gained through on site mensuration. The standard maintaining densities of different diameter classes were worked out. The suggested accumulation, individual amount for tending felling was 40.1 % and 39.98 % respectively. The tending felling accumulation and out-put volume was 51 359 m³ and 32 330 m³ respectively.更多还原