作者曾经於1956年11月在林业科学上,发表过“论环境条件的相反相成作用,在林业上的应用”的论文,根据唯物辩证的观点,论证自然淘汰的问题。现在所谈到的疏密度学说,仍然在以前理论基础上,作进一步的系统阐明和论证,但在谈疏密度学说以前,首先必须明确几个问题,同时这也是作者意图解决的几个问题:第一;在世界各国,关於这类术语的概念内容是不完全一致的。在苏联有疏密度,郁闭度和密度而无立木度。在德日以及其他各国有立木度,郁闭度和密度而无疏密度。而且在定义方面又有差别,在20世纪的林业科学上,这不能说不是一个严重的缺点。同时可能有人认为这 In November 1956, the author once published a thesis on “the opposite phase effect of environmental conditions and its application in forestry” in forestry science, demonstrating the issue of natural elimination based on materialist dialectics. The theory of density nowadays is still based on the previous theory for further clarification and demonstration of the system. However, before we talk about the theory of density, we must first make clear a few questions and at the same time, it is also the question that the author intends to solve: First, in countries all over the world, the conceptual content of such terms is not entirely consistent. There is density, density and density in the Soviet Union without standing timber. In Germany and Japan and other countries have established wood degrees, canopy density and density without sparse density. And there are differences in definitions, which can not be said to be not a serious shortcoming in the 20th century forestry science. At the same time some people may think this