【摘要】 通过不同经营密度杉木人工林生长进程的比较分析可知,在相同年龄下,杉木林树高、胸径和材积总生长量、连年生长量和平均生长量均随密度降低而增大,且密度小的林分连年生长量和平均生长量相交的时间推迟2~4 a,林木生长的速生期有延长的趋势,呈现出较强的生长后劲.密度管理是杉木大径材定向培育的关键措施,培育杉木大径材应在10 a前后,并且适时调整林分密度,以适当增加立木中大径木所占比例,促进大径木成材.保留密度以1 200株.hm-2左右较为适宜,可获得较高的大径材种出材量,提高单位面积的木材产量.更多还原

【Abstract】 By comparing the growth process of Cunninghamia lanceolata controled in different densities,the results showed that the total growth,current annual increment and mean increment of height,DBH(diameter at breast height),and volume increased with density decreasing at the same age, the intersection period of current annual increment and mean increment of Cunninghamia lanceolata stands with lower density is later than that of others for 2～4 years,the fastgrowth period of lower density stands would lengthen vigorously.Density management is a key measure of cultivating big-diameter timber of Cunninghamia lanceolata.Stand density must adjust appropriately in about 10 years to increase the percentage of middle and big-diameter timber and promote the formation of big-diameter timber.The appropriate retaining stand tree number should be(1 200) trees per hm~2,from which high timber yield and output of timber per unit area would be attained.更多还原