采叶型南方红豆杉扦插苗优良株型选择及生长动态

Superior trees selecting and their growth tendency from cutting seedlings of Taxus chinensis var. mairei for leaf picking

通过对14棵长势较好的4年生南方红豆杉(Taxuschinensisvar.mairei)扦插苗的单株分枝数、单株叶片生长量的测量,计算单株相对分枝数、单株叶片相对生长量,二者求和得株型系数。选择株型系数较大的植物作为采叶优株。利用分形几何原理,以同龄南方红豆杉实生苗作对照,研究采叶优株的分形特征。结果表明采叶优株的分形维较大,采叶优株的每年分枝枝数和每年枝条生长总量显著高于实生苗,说明采用株型系数选择采叶优株的标准是合理的。

Single tree branching numbers and leaf growth quantities of Taxus chinensis var. mairei cutting seedling were measured,single tree relatively branching numbers and leaf relatively growth quantities were calculated,both of them were added together to make tree model coefficient. The trees with bigger tree model coefficient were selected as superior tree for leaf collecting. Fractal characteristic of superior tree for leaf picking were studied by adopting fractal geometry principle,and seedling was regarded as control. The results showed that fractal dimension of superior tree for leaf picking was bigger,branching numbers per year and total branch growth quantities per year were significantly higher than those of seedling's,it proved that the standard of using tree model coefficent to select superior tree for leaf picking was reasonable.