摘要
通过建立固定标准地,研究福建南平峡阳林场一片29年生第1茬杉木人工林的林分密度对第2茬杉木林的造林成活率和2年生林分生长的影响,结果表明,第1茬杉木林分密度与第1茬林分蓄积量呈显著正相关关系;最高密度等级(1500株·hm-2以上)的第1茬杉木林在采伐后营造的第2茬杉木林,其造林成活率和2年生的生长量最低.第1茬杉木林较高的林分密度不利于对土壤性质具有改良作用的林下植被的发育,导致林地土壤容重显著增大,引起第2茬杉木造林成活率和生长量降低,对长期生产力的维持不利,其对地力的影响程度甚至超过立地管理措施.前茬林分密度过大(密度超过1500株·hm-2)可能是杉木连栽地力衰退的重要原因之一.
The effects of the stand density of a 29yearold,firstrotation Chinese fir plantation on survival rate of planted seedlings and growth of 2yearold,secondrotation Chinese fir plantation in Xiayang Forest Farm,Nanping,Fujian,China,were investigated by permanent plot samplingAnalysis of the results showed that stand volume was positively correlated with the stand densitySurvival rate of planted seedlings and growth rate of 2yearold,secondrotation Chinese fir plantation were significantly lower in the plots with highest level of stand density (over 1 500 stem·hm-2) of the firstrotation Chinese fir than those in the plots with lower levels of stand densityHigh stand density of the firstrotation Chinese fir was not favorable to the development of understorey vegetation which may improved soil properties, and it caused an increase in soil bulk density leading to lower survival rate of planted seedlings and growth rate of the secondrotation Chinese fir plantation,and was a disadvantage to maintain the longterm productivity of forest plantationsThe degree of impact on the longterm productivity of stand density factor was greater than that of site management factorHigher stand density (over 1 500 stem·hm-2) of former rotation may be one of the important factors responsible for the soil deterioration and yield decline
出处
《福建林学院学报》
CSCD
北大核心
2003年第3期225-228,共4页
Journal of Fujian College of Forestry
基金
CAF/IDRC/CIFOR国际合作项目REDFOL专题"中国杉木人工林多代经营立地管理与生产力研究"
国家自然科学基金重点资助项目(39630240).
关键词
杉木
生长
林分密度
立地管理
Chinese fir
second rotation
stand density
site management
growth
