红花尔基沙地樟子松种群优势度增长动态及自疏规律的研究

STUDY ON DOMINANCE DYNAMICS AND SELF-THINNING OF PINUS SYLVESTRIS VAR.MONGOLICA POPULATIONS ON SAND LAND AT HONGHUAERJI

摘要: 用逻辑斯谛模型分析了红花尔基沙地不同类型樟子松种群胸高断面积增长规律,发现从坡底到坡顶,环境容纳量逐渐减小,种群内禀增长率降低,种群胸高断面积最大增长速度逐渐减小,种群的特征返回时间逐渐增大。樟子松种群自疏规律为:平均胸径与密度的关系符合负幂函数模型。

Abstract: The growth of DBH area of Pinus sylvestris var.mongolica populations on sand land at Honghuaerji is well described by Logistic model in this paper.Environmental carrying capacity,intrinsic growth rate,and highest growth speed of DBH area of population gradually decrease,the characteristic return time of population increase gradually from the footof slope to the top.Regulation of selfthinning is that relationship between DBH and average density of population accords with negative power function.