摘要
采用Levins和Pianka公式计测了冀北山地杨桦次生林群落乔木层8个种群的生态位宽度和生态位重叠,并对种群的生态位和环境适应性进行了探讨。结果表明:白桦、山杨和棘皮桦为主要树种,其他树种均为伴生树种。白桦、色木槭、稠李、山杨等具有较大的生态位宽度,分别为0.866 8、0.854 1、0.721 9和0.682 9,而蒙古栎和山荆子等生态位宽度较小。生态位重叠值小于0.5的种对有14对,占总数的50%。生态位重叠值大于0.5的种对有13对,占总数的46.43%。不发生重叠的种对有1对,占总数的3.57%。具有较大生态位宽度的树种是主要优势种,具有广泛的适应性。生态位宽度较大的物种与其他种类间的生态位重叠也较大。
The eight populations of tree layer in secondary forest of seeondary poplar-birch forest which located in the moun-tainous region of northern Hehei Province were mensurated using the formula described of Levins and Pianka. Meanwhile, the niche of population and environmental adaptability was probed. The results showed： Betula platyphylla, Populus davidiana, Betula dahurica were main species, other species were associated. Betula platyphylla,Acer mono, Padus racemosa, Populus davidiana had greater niche breadth, with 0.8668, 0.8541, 0.7219, 0.6829 respectively; but the niche breadth of Quercus mongolica and Malus baccata were smaller.There were 14 species counterparts which were less than 0.5 of the niche overlap, accounted for 50% of the total. Thirteen species counterparts niche overlaps was more than 0.5, which take up 46.43% of the total. One pair had no overlap, which was 3.57% of the total. The greater niche breadth species were main species which had broad adaptability. At the same time, they had greater niche overlaps with other species.
出处
《河北林果研究》
2011年第3期231-234,共4页
Hebei Journal of Forestry and Orchard Research
基金
科技部公益专项<三北地区生态林可持续经营关键技术研究与示范研究>(200804027)
关键词
冀北山地
杨桦次生林
生态位
north mountain of Hebei
secondary poplar-birch forest
niche
