摘要
以同处于演替层15年生(龄级Ⅰ)和22年生(龄级Ⅱ)的人工红松-天然阔叶混交林为对象,对林下栽植红松个体的开敞度(K)进行调整(K=1.0,1.5,2.0),研究调整后4年间林下红松直径和树高生长量及第4年的红松生物量状况.结果表明:2个龄级红松地径/胸径和树高定期生长量和地上部生物量均以K=1.0处理最大;随时间的延伸,K=1.5和K=2.0处理对年生长量的促进效果不断增强,接近或超过K=1.0处理.龄级I的K=1.0处理的树干生物量比例显著高于其他处理和对照,而龄级Ⅱ各处理的差异不明显;龄级I各处理的枝叶生物量比值均显著高于对照,而龄级Ⅱ则差异不显著;两个龄级不同年龄针叶的比例及分布状态不同.开敞度为1.0～2.0时有利于次生林林冠下栽植的15～22年生红松的生长发育.
Taking mixed forest of artifical Pinus koraiensis and natural broad-leaved trees as test material,among which the P.koraiensis was 15（stage I） and 22（stage Ⅱ） years old respectively,and was in the same succession layer,the height and diameter increment during 4 years experimental period and the aboveground biomass（AGB） at the 4th experimental year for P.koraiensis were measured in the opening degree（K=1.0,1.5,2.0） regulation experiment.The periodic increment of basal diameter（BD）/diameter at breast height（DBH）,tree height and AGB of P.koraiensis trees were highest in the opening degree K=1.0 treatment.The opening degree K=1.5 and K=2.0 treatments promoted the annual increment of P.koraiensis,with the effect increased along with the experimental period elongation and approached or exceeded that of K=1.0 treatment.The stem biomass proportion of P.koraiensis trees was significantly higher in K=1.0 treatment than that in the other treatments and the control in stage I,but no significant difference among treatments was found in stageⅡ.The ratio of branch to needle biomass in all opening degree treatments was also significantly higher than that in control in stage I,but no significant difference in stage Ⅱ.The proportion and distribution of needles in different ages differed in the two stages.It was concluded that opening degrees of 1.0-2.0 were all suitable for the growth of P.koraiensis of 15-22 years old trees planted under secondary forest.
出处
《应用生态学报》
CAS
CSCD
北大核心
2011年第11期2781-2791,共11页
Chinese Journal of Applied Ecology
基金
林业公益性行业科研专项(201104070)
"十一五"国家科技支撑计划项目(2006BAD03A04)
科技部农业科技成果转化资金项目(2007GB24320427)
吉林省博士后科研项目资助
关键词
红松
开敞度
量化调控
径高生长量
生物量
Pinus koraiensis
opening degree
quantitative regulation
diameter and height increment
biomass.
