秃杉人工林生长过程

用解析木法测定早期引种秃杉林中优势木1株、种源试验林中优势木和平均木各1株,结果表明,秃杉树高生长从5年以后进入速生期,持续至18年生;胸径生长从6年生时进入速生期,持续到20年生;材积生长从14年起进入速生期,至24年生时连年生长曲线仍未与年平均生长曲线相交,还未达数量成熟。用Logistic模型模拟树高、胸径、材积生长进程曲线,确定材积、胸径、树高速生期为13.64,12.77,11.27年。初步确定秃杉8年生以前为幼龄期,8~16年生为速生期,16年生以后为速生稳定期。

Study on Growth Process of Taiwania flousiana Plantation

Three trees,one superior tree in plantation,one superior and one intermediate tree in provenance trial forest were studied by analytical tree method.The results showed that the tree height has a fast growing time beginning the fifth years after planting,and then held the line up to the eighteenth year.The fast growing period of breast diameter began the sixth year,and kept this period to the twentieth year.But volume began the fourteenth year,that latter than the two former,then increased up to the twenty-fourth year.The three parameters were modeled by Logistic equation and quantified the beginning year of fast growth: 13.64 for volume,12.77 for breast diameter and 11.27 for tree height.So the growth laws of Taiwania flousiana plantation could be calculated below: first eight years was the juvenile period,the fast grow period was 8~16 years,the fast grow stably period began the sixteenth year.