宝天曼自然保护区锐齿栎种群空间分布格局研究

摘要

为了揭示宝天曼自然保护区锐齿栎种群空间分布格局的形成机制和分布规律,采用离散分布理论拟合、方差/均值比率法和聚集强度测定的方法,对宝天曼锐齿栎种群在不同取样尺度上、不同发育阶段和不同海拔梯度的空间分布格局进行了研究.结果表明:不同取样尺度下,种群反映出不同的聚集程度,聚块性指数(m*/m)和扩散型指数(I3)基本上随取样尺度的增大而减小,样方大小对宝天曼自然保护区锐齿栎种群分布格局的测定结果具有显著影响;不同发育阶段的锐齿栎种群的空间分布格局存在差异,幼树和中径树均表现为聚集分布,但聚集程度不同,幼树的聚集程度比中径树的高,大树的空间分布格局表现为随机分布类型;不同海拔梯度的锐齿栎种群空问分布格局存在差异,聚集程度不同.%To study the mechanism of spatial distribution patterns and variations of Quercus aliena var.Acutesrrata populations, the changes of distribution pattern of Quercus aliena var. Acutesrrata populations in Baotianman Nature Reserve were analyzed in different sampling scales, developing stages and altitudinal gradient by testing discrete distribution fitting, variance/mean ration and the measurement of aggregation intensity. The results indicated that quadrat size had a signhficant effect on measurement of spatial distribution pattern of population. Values of patchiness index m */m and dispersion index Is of the population decreased with the increase of sampling scale reflecting the measured degree of aggregation of the population varied with sampling scale. The spatial distribution pattern of the Quercus aliena var. Acutesrrata populations at different developing stages is different, sapling and middle tree stage showed aggregated distribution, but the degree of aggregation was different, the sapling tree had a higher degree of aggregation than the middle tree, while the spatial pattern of the large tree showed random distribution. The spatial distribution pattern of the Quercus aliena var. Acutesrrata populations at different altitudinal gradient is different.