沙地樟子松不同切根密度育苗的研究

DENSITY-TEST ON ROOT CUTTING OF SEEDLINGS OF PINUS SYIVESTRIS VAR MONGOLICA IN SANDY NURSERY

通过对 14个切根密度苗的研究得出樟子松切根苗密度不同 ,质量也不同 ,苗木的径根比随密度的增大而增大 ;苗大的干物质随密度的增大而降低 ,地上部分干物质大于地下部分干物质 ;造林成活率随径根比的减小而增大 ;苗木密度在 12 0～ 2 2 0株 m2 之间是苗木质量较好且获得较大效益的合理密度 ;苗圃可根据经济评价指标确定适合自己的合理密度。

Fourteen densities were tested in raising 2 0 type seedlings.It was showed that density affected on seedling quality a lot.The higher of the density,the bigger of the shoot root ratio,and the less of the dry matter.The dry matter of above ground was more than that of under ground.The survival rate in afforestation was in negative relation with shoot root ratio.Densities berween 120 seedlings/m 2～220 seedlings/m 2 were reasonable for both seedling quality and profit.Nurseries could define densities their own according to the economic index.