山东赤松种群的空间分布型及强度

利用分布类型和聚集强度指数对山东主产区赤松种群的空间分布型及强度进行了初步研究,结果表明：鲁东丘陵区的赤松种群生林一般表现为负二项分布和奈曼分布,鲁中南山地丘陵区的人工林则呈现均匀分布;在赤松种群不同发育阶段,出现了由幼苗→幼树→大中树扩散态势的一般规律,但鲁东丘陵区次生林由于受人为、虫害等因素的影响,其分布类型和聚散态势呈明显的多样化,鲁中南山地丘陵区人工林则表现为聚集→扩散的独特态势。

SPATIAL DISTRIBUTION PATTERNS AND INTENSITY OF PINUS DENSIFLORA POPULATION IN SHANDONG PROVINCE

By using the probability distributions and aggregation intensity indxes, the types of spatial patterns and intensity of Pinus densiflora population in Shandong Province were preliminarily studied. The results indicate that the distribution patterns of the secondary Pinus densiflora forest in the hilly land of East Shandong are negative-binomial distribution and Neyman distribution; and that the distribution patterns of artificial Pinus densiflora forest are well-distributed in the mountains and hills in Middle and South Shandong. During the different growth stages of Pinus densiflora population, the common tendency rule of dispersion is found from seedling to tiny tree and to aged tree, but the secondary forest in the hills in East Shandong shows the obvious diversity of the distribution patterns and tendency of clumping and dispersion, and the artificial forest in the mountains and hills of Middle and South Shandong shows the special tendency from aggregation to dispersion. Tab 5, Ref 4