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根据野外调查数据,对长白山沼泽交错带白桦个体生长动态、径级结构以及种内和种间竞争强度进行研究,并探讨竞争强度与径级之间的关系。结果表明:白桦植株胸高断面积与树高之间存在显著的Sigmoid函数关系,胸径和树高分别为18.3 cm和19.4 m,是白桦由高生长向径生长过渡阶段;白桦种群更新幼苗稀少,径级结构呈纺锤形,径级-株数密度分布规律可以用Lognormal函数很好地表征;白桦种内和种间竞争强度分别为48.80%和51.20%;白桦种内和种间竞争强度的顺序为:白桦种内>长白落叶松>辽东桤木>山杨>蒙古栎>稠李>水曲柳>色木槭>茶条槭>春榆;竞争强度随对象木胸径的增加而降低,当对象木胸径在20 cm以内时,竞争强度较大,当胸径达20 cm以上时,竞争强度变化很小,竞争强度与对象木胸径较好地服从幂函数关系(CI=AD~(-B)),该模型能够较好地预测沼泽交错带白桦种内和种间竞争强度。
Based on the field survey data, the individual growth dynamics, diameter structure, intraspecific and interspecific competition intensity of Betula platyphylla in the Changbai Mountain swamp ecotone were studied, and the relationship between competition intensity and caliber was discussed. The results showed that there was a significant sigmoid function relationship between the area of height of chest and height of birch and height of tree, the diameter and height of tree were 18.3 cm and 19.4 m respectively, which was the transition stage from high growth to radial growth of birch; The order structure was spindle-shaped, and the diameter-number-density distribution was well characterized by Lognormal function. The intraspecific and interspecific competition of G. birch was 48.80% and 51.20%, respectively. The order of intraspecific and interspecific competition was as follows: Betula platyphylla> Larix olgensis> Liaodong alder> Populus> Quercus mongolica> Chrysanthemum morifolium> Fraxinus mandshurica> Acer palmatum> Acer palmatum> Ulmus pumila; competition intensity decreased with the increase of DBH, When the DBH is within 20 cm, the competition intensity is larger. When the DBH reaches 20 cm or more, the competition intensity changes little, and the competition intensity and the object DBH conform to the power function relation (CI = AD ~ (-B)), The model is able to predict the intraspecific and interspecific competition between Betula platyphyla in a swamp interlaced zone.