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克隆植物不同年龄分株间可以通过生理整合作用相互传递资源,实现资源共享。施肥可以改变林地资源状况,进而可能影响分株间的整合作用及不同年龄分株间的生长关系。该文采用标准主轴(SMA)估计法和多元回归分析,对不同施肥管理下大型克隆植物毛竹(Phyllostachys edulis)种群不同年龄分株(1年生分株、3年生分株和5年生分株)间的胸径(DBH)关系进行了研究,探讨毛竹不同年龄分株DBH大小关系对施肥的响应。结果表明:连续5年施肥有效地增加了毛竹1年生分株的DBH,而施肥1年处理下,1年生分株DBH与3年生分株和5年生分株平均DBH差异不显著(p>0.05)。1年生分株与3年生分株和5年生分株DBH之间的SMA斜率为0.88–1.10,均与1.00不存在显著差异(p>0.05),表现为等速生长关系。施肥1年和连续施肥5年没有改变不同年龄分株DBH之间的SMA斜率,但连续5年施肥导致SMA的y轴截距显著增大(p<0.001),即在3年生分株和5年生分株DBH相同的情况下,连续5年施肥使1年生分株具有更大的DBH增长量。采用多元线性逐步回归分析发现,毛竹1年生分株的DBH大小在很大程度上受3年生分株DBH大小的影响,而连续5年施肥可增强5年生分株对1年生分株DBH大小的影响。
Clonal plant ramets of different ages can pass the physiological integration of resources to each other, sharing of resources. Fertilization can change the status of forest resources, which may affect the integration between ramet and the growth relationship between ramets of different ages. In this paper, the standard principal axis (SMA) estimation method and multiple regression analysis were used to analyze the relationships among different age groups (1 year old, 3 year old and 5 year old) of Phyllostachys edulis population under different fertilization treatments. (DBH) were studied to investigate the response of DBH size to fertilization in ramets of different age ramets. The results showed that applying DBH for 5 years effectively increased the DBH of 1-year-old bamboo ramets, while the mean DBH of 1-year DBH, 3-year-old ramets and 5-year-old ramets did not show significant difference (P> 0.05 ). The slope of SMA between 1-year-old and 3-year-old and 5-year-old DBH was 0.88-1.10, which was not significantly different from 1.00 (p> 0.05), showing an isokinetic growth relationship. Fertilization for one year and continuous fertilization for five years did not alter the slope of SMA between DBH strains of different ages, but the 5-year fertilization resulted in a significant increase in the y-intercept of SMA (p <0.001) Under the condition of the same age DBH, fertilizing for 5 years continuously increased the annual growth of DBH. Using multiple linear stepwise regression analysis, it was found that the DBH size of 1-year-old ramets of bamboo was influenced to a large extent by the DBH size of 3-year-old ratooning strains. However, applying 5 years of continuous fertilization enhanced the DBH size of 5-year- influences.