【摘要】 本文对影响双龙油松良种基地及采种基地油松种子产量的林分分布、坡向、林分密度、种实害虫等因素进行了调查分析,并提出了相应的对策。更多还原

【Abstract】 Qiao Mountain forest area,an important seed harvest base,is located in the central distribution region of Pinus tabulaeformis Carr in China.The seed yield of Pinus tabulaeformis Carr for recent years has been very low,to the extent of no harvest.This paper studied the influential factors such as stand distribution,aspect of slope,density of stand and disease and pests within the fine variety base as well as the seed-harvest base of Pinus tabulaeformis Carr..Measures for improvement were put forward,accordingly.更多还原