摘要
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.
This study aimed to thoroughly understand the renewal characteristics of dominant species in plant community, and to provide scientific basis for natural regeneration of coniferous and broadleaved mixed forest. We studied the spatial distribution patterns of regenerating Quercu wutaishanica and Pinus tabulaeformis and its relation with topographic factors using continuous quadrat method in a 4 - hm2 sample plot in the Lingkong Mountain of Shanxi Province. It was found that the diameter-class structure was similar for both Q. wutaishanica and P. tabulaeformis, where most individuals were small and medium in size. Q. wutaishanica showed notable bottleneck phenomena among the individuals of 4-cm DBH, while P. tabulaeformis were all in growth state. For both species the seedlings outnumbered the saplings and the individuals in both age classes clustered only in small scale （0-5 m）, but randomly distributed in larger scales, No obvious correlation was observed between the regenerating seedlings and saplings within and between the species. Most renewed seedlings and saplings of Q. wutaishanica grew in shady or semi-shady slopes, but those ofP. tabulaeformis grew in semi-sunny slopes. The highest density of young trees was found in the slope of 20-30 degrees for both species. In Q. wutaishanica the altitude was positively correlated to seedling abundance （r = 0.152, P 〈 0.01） but negatively to saplings （r = -0.102, P 〈 0.05）. However, no such correlation was observed in P. tabulaeformis. These results showed that the spatial distribution of regeneration of Q. wutaishanica and P. tabulaeformis is mainly of random patterns. The slope-exposure is obviously different between the two species in regeneration. The gradient factor ,which is determined by the topographic preference of the species, influences the abundance and density of species to a certain degree, but has no obvious stimulative or depressive effects on regeneration of the two species.
出处
《应用与环境生物学报》
CAS
CSCD
北大核心
2013年第6期914-921,共8页
Chinese Journal of Applied and Environmental Biology
基金
山西省基础研究计划项目(2011011030-1)资助~~
关键词
辽东栎
油松
更新
空间分布
地形因子
Quercus wutaishanica
Pinus tabulaeformis
regeneration
spatial distribution
topographic factor
