江汉平原水杉人工林生长规律研究

通过对江汉平原水杉人工林的观测调查和树干解析,分析探讨了水杉树高、胸径和材积的生长规律,建立了水杉树高、胸径、材积生长量及形数随年龄变化的数学模型,结果表明:水杉树高前期生长较快,平均生长量6 a时达到最大,连年生长量和平均生长量在13～15 a相交;胸径连年生长量和平均生长量均表现为先升后降,其中6～12 a生长最为迅速;材积总生长量在前24 a一直处于较快生长状态,估计即将达到数量成熟龄,该研究为科学指导水杉人工林的定向培育提供了参考。

Growth Rules of Metasequoia glyptostroboides Plantation in Jianghan Plain

Through the trial investigation and stem analysis of Metasequoia glyptostroboides plantation in Jianghan Plain,the growth rules of height,DBH and volume were studied and discussed,and a mathematical model was established.The results showed that Metasequoia glyptostroboides had a rapidly height growth in the early stage,and the mean height increment reached the maximum at the six years,the annual growth and the mean growth would intersected between 13 and 15a;annual increment and mean increment of DBH firstly increased and then reduced,the rapidest between 6-12 a;the volume grew rapidly during the first 24a,and reached the age of numerical maturity,the study provided a reference to guide the oriented cultivation of Metasequoia glyptostroboides plantation.