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以红桦-岷江冷杉林4hm2样地调查数据为基础,采用点格局分析法O-ring函数,分析了红桦和岷江冷杉2个优势种群不同龄级的空间分布格局,以及各龄级间的种内和种间关联性.结果表明:红桦种群径级分布呈单峰型,为衰退种群;岷江冷杉种群径级分布呈倒“J”型,为进展种群.岷江冷杉与红桦大树在所有尺度上均为随机分布,其余龄级在小尺度上为聚集分布,随尺度增大趋于随机分布和均匀分布,最大聚集强度随龄级增大而减弱.空间关联主要发生在小尺度上.岷江冷杉种内关联以小尺度正关联为主,红桦种内关联以小尺度负关联为主.对于2个种群的相同龄级,小龄级、中龄级和大龄级间,分别以空间无关联、负关联和无关联为主.2个种群间不同龄级间以负关联为主,龄级相差越大,其负关联越强.
Based on the survey data of 4hm2 samples of Abies faxoniana and Abies faxoniana, spatial distribution patterns of two dominant populations of Betula platyphylla and Abies polyphylla were analyzed by O-ring function of point pattern analysis, The results showed that the diameter distribution of Betula platyphylla was single peak and declined, and that of Abies faxoniana was inverted J type, The tree is randomly distributed at all scales and the remaining age classes are aggregated on a small scale, which tends to be randomly and uniformly distributed with the increase of scales, and the maximum aggregated intensity decreases with age. Spatial correlation mainly occurs in On the small scale, the inner correlation of A. absinthe is mainly small-scale positive, while the inner correlation of Betula platyphylla is dominated by small-scale negative correlation.For the same age class, young age class, middle age class and older age class , Respectively, with no spatial correlation, negative correlation and no correlation.The two groups are mainly negative associations between different age classes, the greater the age difference, the stronger the negative correlation.