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本文通过对各国有关植物种群密度与生长理论研究专著、论文、试验报告中的数据和结论进行分析,结合作者的研究实践,说明在密度与收获量的模式中的一定区间内存在着C—D效果(竞争—密度效果)和Y—D效果(收量—密度效果),指出了林分合理密度有显著的增产效益。认为过去笼统地认为植物种群密度对总生物量或总产量影响不大的观点并不准确。本文指出合理密度的增产效益有其空间结构和功能的理论基础,有深入研究的必要。
This paper analyzes the data and conclusions in monographs, dissertations and test reports of plant density and growth theory in various countries and the author’s research practice to show the existence of C-D in a certain range in the pattern of density and harvest. Effect (competitive-density effect) and Y-D effect (yield-density effect), it is pointed out that there is a significant yield increase effect on the reasonable density of stand. It is inaccurate to think of the general view that the density of plant population had little effect on total biomass or total yield in the past. This paper points out that the yield increase of reasonable density has the theoretical basis of its spatial structure and function, which is necessary for further research.