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以吉林省蛟河42 hm2针阔混交林动态监测样地为平台,在样地内选取224个1 m×1 m幼苗监测小样方,基于2013年6至8月每月中旬的幼苗监测数据,对乔木幼苗物种组成、数量特征、月际动态及幼苗与同种大树之间的关系进行分析。结果表明:(1)该群落共调查到乔木树种幼苗16种。物种组成在6月和7月间变化不大,但与8月差异较大。物种组成在各样方间表现出极大的差异性,不同种幼苗出现的样方数为1–159。(2)6月至8月,幼苗个体从1 722株减少到1 214株,降幅达29.5%。不同种幼苗在个体数量上变异较大,个体数超过100的幼苗有色木槭(Acer mono)、水曲柳(Fraxinus mandschurica)、紫椴(Tilia amurensis)和东北槭(Acer mandshuricum),四者个体数之和占所有物种个体总数的84.26%;不同种幼苗密度变异性较大,只有色木槭、水曲柳、紫椴和东北槭密度大于1株·m–2,其他种幼苗密度均较低。(3)新生幼苗更新、死亡格局表现出明显的种间差异与月际间差异,7月新生幼苗总体死亡率(48.9%)显著高于8月(28.3%);整个调查季(6–8月),新生幼苗总体死亡率(40.56%)明显高于多年生幼苗(7.34%)。就幼苗更新情况而言,该研究群落一年中更新主要集中在6月。(4)色木槭、紫椴、杉松(Abies holophylla)幼苗的密度与同种成年个体的胸高断面积之和之间存在显著的正相关关系(p=0.006、0.013、0.037),表明三者幼苗密度随周围母树多度的增加而增加,其他物种幼苗密度与同种个体数目或同种胸高断面积之和未表现出显著的相关关系。
Based on the dynamic monitoring plots of 42 hm 2 coniferous and broad-leaved mixed forests in Jiaohe, Jilin Province, 224 sample plots of 1 m × 1 m seedlings monitoring were selected in the plots. Based on the monthly monitoring data of seedlings from June to August in 2013, Tree seedlings species composition, quantitative characteristics, monthly dynamics and the relationship between seedlings and the same kind of big tree were analyzed. The results showed that: (1) 16 species of tree seedlings were surveyed in this community. Species composition did not change much between June and July, but it differed greatly from August. Species composition showed great difference in various quarters, and the number of quadrats in different seedlings was 1-159. (2) From June to August, the number of seedlings decreased from 1 722 to 1 214, a decrease of 29.5%. Acer mono, Fraxinus mandschurica, Tilia amurensis and Acer mandshuricum were the main species of seedlings with different numbers of individuals. And the total number of all species accounted for 84.26% of the total number of individuals; different seedling density variability larger, only Maple, Maple, Tilia amurensis and Acer Nuriaceae density greater than 1 strain · m-2, the other species density low. (3) The newborn seedling renewal and death pattern showed obvious inter-species differences and inter-month differences. The overall death rate of newborn seedlings in July (48.9%) was significantly higher than that of August (28.3%); Month), the overall mortality of newborn seedlings (40.56%) was significantly higher than that of perennial seedlings (7.34%). In the case of seedling renewal, the research community is mainly concentrated in the year of update in June. (4) There was a significant positive correlation (P = 0.006, 0.013, 0.037) between the density of seedlings of Aizhe maple, Tilia amurensis and Abies holophylla (p = 0.006, 0.013, 0.037) The density of seedlings increased with the increase of the abundance of surrounding mother trees. The density of seedlings of other species did not show a significant correlation with the number of the same species or the area of the same kind of breast.