长白山林线岳桦种群生态特征研究

Study on the ecological characteristics of the Betula ermanii Cham.population in Changbai Mountains

为了解长白山林线岳桦种群动态特征,本文通过长白山林线岳桦种群样地调查,编制岳桦种群的静态生命表,绘制了岳桦种群的存活曲线和生存分析曲线。研究结果表明:随龄级增加,岳桦种群结构呈典型反“J”型,属于增长型种群;岳桦种群存活个体数和生命期望呈下降趋势,而个体死亡率和消失率呈上升趋势;岳桦种群的存活曲线呈DeeveyII型(对角线型);岳桦种群的生存率曲线呈递减趋势,累计死亡率曲线和危险率曲线呈递增趋势,死亡密度曲线基本保持不变。

In order to understand the dynamic characteristics of the Betula ermanii Cham.trees along the Changbai Mountains.The static life table of the B.ermanii Cham.population was compiled,and the survival curve and survival analysis curve of the B.ermanii Cham.population were drawn.Research indicated,with the increase of age grades,the population structure of the B.ermanii Cham.was a typical reverse"J"type,which belonged to the growing population;The number of surviving individuals and life expectancy of the B.ermanii Cham.population showed a downward trend,while the individual mortality and disappearance rate showed an upward trend;The survival curve of the B.ermanii Cham.population was Deevey II type(diagonal type);The survival rate curve of the B.ermanii Cham.population showed a decreasing trend,the cumulative mortality curve and hazard rate curve showed an increasing trend,and the death density curve remained basically unchanged.