宁夏贺兰山油松林林隙幼苗幼树龄级结构特征研究

Characteristics of the Age Structure of Chinese Pine Seedlings and Saplings in the Chinese Pine Forest Gaps of the Helanshan Mountain in Ningxia

对宁夏贺兰山油松林林隙内油松幼苗幼树进行调查和数据统计,通过绘制死亡率曲线、亏损度曲线,分析了幼苗幼树的年龄结构。结果表明,幼苗幼树的的年龄结构呈反"J"分布型、属于增长型种群。该种群具有前期增长、后期稳定的特点,油松是贺兰山优势种之一,研究结果对宁夏贺兰山天然植被的恢复和重建提供了早期研究基础。

The seedlings and saplings in Chinese pine forest gaps in Ningxia Helanshan Mountain were studied in this paper. Based on the analysis of death rate and defective degree curves, the age structure of the seedlings and saplings were analyzed. The results showed that the age structure of the seedlings and saplings appeared to distribute in anti-versed J shape and showed up-growth trend. The growth of this population increased at the early stage and kept stable at the late stage. Chinese pine is one of the dominating forest population in Helanshan Mountain, and the fundamental data for the restoration and re-establishment of natural vegetation at the early research stage in Ningxia Helanshan Mountain were provided.