【摘要】 对江汉平原水杉、池杉和落羽杉人工林的生长规律进行了研究。结果表明:水杉、池杉和落羽杉的胸径生长前期较快,连年生长量和平均生长量总体上均呈先升后降的趋势,总生长量在12年生以前比较接近,12年生之后落羽杉最大,池杉次之,水杉最小。树高生长也是早期较快,平均生长量均随树龄增加总体上呈下降趋势,且总生长量没有明显差别。材积在24年生以前一直处于较快生长状态,且与树龄的相关关系较强,落羽杉材积的平均、连年、总生长量均最大,其次为池杉,水杉最小。水杉、池杉和落羽杉的干形通直圆满,材积生长率和形数均随树龄的增加而逐渐减小。更多还原

【Abstract】 A study was conducted on the growth regularity of Metasequoia glyptostroboides,Taxodium distichum and Taxodium distichum in Jianghan Plain.Results showed that these three tree species exhibited a rapid diameter at breast height(DBH) growth in the early stage,and the annual increment and mean increment of DBH increased first and then decreased.The total growth increments of DBH of these three tree species were close before 12 years old,while after 12 years old the total increment of T.distichum was the highest,followed by T.distichum and M.glyptostroboides.Tree height grew rapidly at the early stage,and the average increment decreased with increasing tree age.An unobvious difference in total growth increment of tree height was observed between these three species.The volume grew rapidly within the first 24 years,and it had a strong correlation with tree age.The mean,annual and total increments of volume of T.distichum were the highest,followed by T.distichum and M.glyptostroboides.These three species all had straight and plump trunk,and the volume growth rate and form factor decreased with increasing tree age.更多还原