不同家系云南松苗木生长的异速现象

The Allometry Growth of Pinus yunnanensis Seedlings from Different Families

研究不同家系云南松苗木的异速生长,有助于了解云南松幼苗的生长速率以及苗木的生活史策略。以云南松1年生的49个家系苗木为研究对象,利用异速生长分析方法分析苗高—地径的异速生长情况。结果表明:不同家系苗木具有不同的异速生长指数,有28个家系的异速生长指数为1.0,符合几何相似模型,为等速生长,其余21个家系为异速生长关系。研究发现在不同家系间苗高—地径既有异速生长表现,也有等速生长表现,生长类型不统一。苗木统一在苗圃培育进行常规管理,所以异速生长的差异主要来自遗传差异,反映了苗木通过对自身的资源配置进行调节,以适应特定环境的资源利用策略。

In order to understand the growth rate of Pinus yunnanensis Franch seedlings and the life history strategy of seedlings,the allometric growth of P.yunnanensis Franch.seedlings from different families was studied.The 49 annual families of P.yunnanensis were selected as materials,the allometric growth analysis method was used to the allometric growth of seedling height and ground diameter.The results showed that different families had different allometric growth index.The allometric growth index of 28 families was 1.0,which was in accordance with the geometric similarity model,and the other 21 families were allometric growth relationship.The results also showed that there were both allometric and isokinetic growth in seedling height and ground diameter among different families.Therefore,the difference of allometric growth mainly come from genetic differences,which reflected the resource utilization strategy of seedlings by adjusting their own resource allocation.