【摘要】 通过对大兴安岭北部兴安落叶松原始林公顷样地的调查,利用Hegyi单木竞争模型分析了兴安落叶松天然林的种内、种间竞争强度。研究结果表明:兴安落叶松天然林的种内、种间竞争强度分别占竞争强度的56%和44%,说明兴安落叶松种间竞争较小,主要竞争来自种内。兴安落叶松伴生树种种类较少,种内与主要伴生树种种间的竞争顺序为:兴安落叶松种内>兴安落叶松种间>白桦种内>白桦种间。兴安落叶松种内竞争强度及白桦种内竞争强度与对象木的胸径大小之间呈指数函数关系,而兴安落叶松种间竞争强度及白桦种间竞争强度与对象木的胸径大小之间呈幂函数关系。随着兴安落叶松胸径的增大,受到的竞争强度逐渐减小。更多还原

【Abstract】 Based on the investigation on a hectare sample plot of original forest of Larix gmelinii in the northern part of the Greater Xing’an Mountains,the intraspecific and interspecific competition intensity of natural forest of Larix gmelinii have been analyzed by use of Hegyi competition index model for individual tree. The results show that the intraspecific and interspecific competition intensity of natural forest of Larix gmelinii accounted for 56% and 44% of the competition intensity separately,indicating that the interspecific competition of Larix gmelinii was small,and the main competition was intraspecific one. There are few species of associated tree species of Larix gmelinii,and the order of interspecific competition and intraspecific competition between Larix gmelinii and main associated tree species is as follows: interspecific competition of Larix gmelinii > intraspecific competition of Larix gmelinii > interspecific competition of Betula platyphylla > intraspecific competition of Betula platyphylla. There was an exponential function relationship between DBH of subject wood and the interspecific competition intensity of Larix gmelinii and Betula platyphylla,however,there was a power function relationship between DBH of subject wood and the intrarspecific competition intensity of Larix gmelinii and Betula platyphylla. With the increase of diameter of Larix gmelinii,the competition intensity for Larix gmelinii decreased.更多还原