【摘要】 研究了100m×140m固定样地内黄连木种群的性比格局和空间分布。结果表明,调查样地中dbh≥4cm的黄连木植株共有2116株,其中包括526株雌树,1200株雄树,性别未确定植株390株。黄连木性比(雄/雌=2.28)显著偏雄(P<0.001)。雌树和雄树平均胸径分别为7.34和7.81cm,雄树胸径显著大于雌树胸径(P<0.05)。黄连木幼树、雌树和雄树均呈显著聚集性分布。黄连木幼树与雌树、幼树与雄树均在较小尺度上表现为相互吸引;雌树与雄树则在空间上相互排斥,即雌树与雄树存在空间分离现象;黄连木不同大小以及不同性别植株之间主要表现为相互排斥。更多还原

【Abstract】 An investigation was made on the population sex ratio and spatial distribution of dioecious tree species Pistacia chinensis within a 100 m × 140 m plot. In the plot,there were 2116 P. chinensis individuals with diameter at breast height (dbh) ≥4 cm,among which,526 were females,1200 were males,and 390 were undetermined. The sex ratio (males/females) was 2.28,indicating a significant male-biased sex ratio (P<0.001). The average dbh of the females and males was 7.34 cm and 7.81 cm,respectively,and the difference was significant (P<0.05). The saplings,females,and males all showed a significant clumped distribution. The saplings showed significant attraction to the females and males at small scales,while the females showed significant repulsion against the males at 0-50 m scales,i.e.,the females and males exhibited spatial segregation. A significant repulsion also exhibited between different size and different sex individuals.更多还原