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为了更深入了解植物群落优势种更新的特点,并为针阔叶混交林天然更新提供科学依据,在山西省灵空山4hm2的样地中采用连续样方法对辽东栎和油松更新空间分布格局及其与地形因子的关系进行了研究.结果表明:辽东栎和油松的径级结构相似,均以小径级和中径级的林木个体居多,辽东栎在胸径为4 cm左右存在明显的瓶颈现象,而油松总体上呈增长状态.两个种群的幼苗数量均高于幼树.辽东栎和油松更新幼苗、幼树仅在0-5 m的小尺度上有聚集分布现象,其余更大尺度上均表现为随机分布.同时,辽东栎和油松更新幼苗、幼树之间无明显关联性.辽东栎更新幼苗、幼树以阴坡和半阴坡分布为主,油松更新幼苗、幼树则主要分布在半阳坡.在坡度20°-30°地段辽东栎和油松更新幼苗、幼树的密度最大.地势高度与辽东栎幼苗多度呈显著正相关(r=0.152,P<0.01),而与幼树呈显著负相关(r=-0.102,P<0.05).油松更新幼苗、幼树的多度与地势高度的相关性不显著.由上述结果可知,辽东栎、油松林更新的空间分布格局以随机分布为主,两个种群的更新在空间分布上对坡向的选择明显不同,而坡度因子在一定程度上影响种群的多度和密度,同时受种群对地形条件的偏好影响,辽东栎和油松更新之间不存在明显的促进或抑制作用.图5表3参29
In order to further understand the characteristics of plant community dominance renewal and to provide a scientific basis for the natural regeneration of coniferous and broad-leaved mixed forest, the spatial distribution pattern of Quercus liaotungensis and Pinus tabulaeformis in 4hm2 plots in Lingkong Mountain, Shanxi Province, The results showed that the diameter structure of Quercus liaotungensis and Pinus tabulaeformis was similar, with the majority of individuals with small diameter and medium diameter, respectively. Quercus liaotungensis had obvious bottleneck at the diameter of 4 cm , While that of Pinus tabulaeformis was generally increased.The seedlings of both populations were higher than that of saplings.The seedlings of Quercus liaotungensis and Pinus tabulaeformis were renewed, and the sapling was only distributed on the small scale of 0-5 m, the rest were larger At the same time, there was no significant correlation between seedlings and young trees renewed by Quercus liaotungensis and Pinus tabulaeformis.The seedlings of Quercus liaotungensis were renewed, the distribution of young trees was mainly on the aspects of shady slope and semi-shady slope, the seedlings of Pinus tabulaeformis were renewed, The saplings were mainly distributed in the semi-sunny slope.The density of young saplings was the highest in the seedlings of Quercus liaotungensis and Pinus tabulaeformis at the slopes of 20 ° -30 °, and the height of the saplings was significantly positively correlated with the seedlings of Quercus liaotungensis (r = 0.152, P <0.01), but significant negative phase with saplings (R = -0.102, P <0.05) .There was no significant correlation between the abundance of saplings and the height of the terrain when the seedlings of Pinus tabulaeformis were renewed.These results showed that the spatial distribution patterns of Q. liaotungensis and Pinus tabulaeformis forests were randomly distributed as The main and two population renewal had obviously different choice of aspect to the spatial distribution, but the slope factor affected the abundance and density of the population to a certain degree. At the same time, influenced by the preference of the population to the topography, the Quercus liaotungensis and Pinus tabulaeformis There is no obvious promotion or inhibition between Figure 5 Table 3 Senate 29