长白山泥炭沼泽桧叶金发藓种群的年龄结构与生长分析

在长白山哈尼泥炭沼泽，应用“固有年际标记”，对有孢子体和无孢子体生产的桧叶金发藓种群进行了年龄结构与生长分析.结果表明，在两种群中，分株均由6个龄级组成，分株数量和生物量年龄结构均呈衰退型，有孢子体生产的种群尤为明显.总体分株生物量无显著差异（P＞0.05），各龄分株干物质积累量均随龄级增加呈相似线性增长规律.总体分株平均高度相差6.17%（P＜0.05），孢子体生产限制了分株高度的生长.各龄分株的平均高度均随龄级增加而呈相似线性增长规律.无孢子体生产的种群内，分株高度的变异程度仅为2.44%，体现了高度一致性对营养株存活的意义.有孢子体生产的种群内，分株高度变异系数为25.07％，分株生物量变异系数仅为8.25％，反映干物质积累量的一致性对种群实现有性繁殖的意义.两种群分株生物量与高度间呈极显著线性正相关（P＜0.001），未表现出异速生长规律.

Age structure and growth pattern of Polytrichum juniperum populations in a mire of Changbai Mountains

In this paper, the age structure and growth pattern of two Polytrichum juniperum populations with and without sporophytes in Hani mire of Changbai Mountains were studied by 'innate annual marker' method. The ramets of both populations were composed of 6 age classes, and their quantity and biomass showed a declining age structure, which was more obvious in the sporophyte produced population. No significant difference of biomass was found (P > 0.05) between the two populations. The dry material accumulation of the ramets in both populations increased with aging, and showed similar patterns of linear function. The ramets mean height of sporophyte-produced population was 6.17% shorter (P < 0.05) than the another, because sporophyte production limited the height growth. The ramets mean height also increased with aging, and showed similar patterns of linear function. In non-sporophyte produced population, the variation coefficient of ramets height was only 2.44%, which indicated the significance of similar height for ramets survival. In sporophyte produced population, the variation coefficient of ramets height was 25.07%, while that of ramets biomass was 8.25%, suggesting the significance of similar biomass to the reproduction of population. The biomass of ramets had a significantly positive correlation with height in both populations (P < 0.001), and no allometric growth was showed.