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采用聚集强度各指标对福建省虎头山半天然杉阔混交林杉木及其伴生树种的种群空间格局进行分析。综合聚集强度各指标的结果表明 :不同立木级杉木及其伴生树种的种群空间分布基本呈聚集分布 ,随着立木级的增大 ,各种群扩散趋势越来越明显。其中杉木、米槠和少叶黄杞聚集强度表现为大→小的趋势 ,拟赤杨和木荷聚集强度表现为大→小→大→小的趋势 ,虎皮楠和丝栗栲聚集强度表现为小→大→小的趋势。低立木级阶段引起聚集分布的原因主要是环境作用 ,高立木级阶段引起的树种聚集分布的原因主要是环境作用或自身聚集性。表 2参 1 3
The spatial distribution patterns of the Chinese fir and its associated tree species in semi-natural Chinese fir and broad-leaved mixed forests of Hutoushan in Fujian Province were analyzed by using the indexes of aggregation intensity. The results of the comprehensive aggregation intensity index showed that the spatial distribution of population of different stands of Chinese fir-wood and their associated species was basically aggregated and distributed. With the increase of standing-wood grade, the tendency of spread of various groups became more and more obvious. Among them, the aggregation intensity of Chinese fir, Miriamulida laevigata, and Chinese chimonanthus xylostella showed a tendency of large → small, and the aggregation intensity of Alnus cremastogyne and Schima superba showed a trend of large → small → large → small. → big → small trend. The main reason for the aggregation distribution in the low-wood stage is the environmental effect. The reasons for the aggregation and distribution of tree species caused by the high-wood stage are mainly environmental effects or self-aggregation. Table 2 Senate 1 3 3