【摘要】 用可见半面树冠法估测油松整株雌花数和球果数 ,结果得出 ,油松整株雌花数和球果数可用半面树冠法进行估测 ,以直线和二次抛物线数学模型为最佳。还比较了目测法和望远镜观测法 ,两种方法观测结果差异显著 ,且两种方法不能混用。更多还原

【Abstract】 A method called visible half crown observation was used to estimate the numbers of female flowers and pinecones in a whole tree.It was found thatthe optimum mathematical models appeared linear or quadratic paraboloidal.A comparison was also carried out between eye survey and telescope survey,both showed significant difference,and can not be inter- mixed.更多还原