环境因子对长白山区天然核桃楸林生长的影响

The Impact of Environmental Factors on the Growth of Juglans mandshurica in Natural Forest of Changbai Mountains

以长白山区14块核桃楸为主具有代表性的林分样地为研究对象,分析核桃楸的生长指标与14个环境因子的相关性,以期揭示环境因子对核桃楸生长的影响。结果表明:(1)不同林分组成的核桃楸林对核桃楸的生长影响显著,其中含落叶松的核桃楸林中径生长优于其他林分的核桃楸,而且郁闭度对树高影响显著(R=0.5049)。(2)坡向和坡位分别与胸径、材积(P<0.05)和树高、胸径、材积(P<0.01)呈显著和极显著相关,而坡度与其材积呈显著负相关(R=-0.5016)。(3)海拔与胸径和材积呈显著正相关(R=0.4918、R=0.5203),经度与材积呈显著负相关(R=-0.5428)。(4)土壤厚度和土壤碱解氮含量对其树高的影响均显著,作用大小为:土壤碱解氮含量>土壤厚度;土壤中有机质含量和土壤pH对其胸径的影响均显著,作用大小为:土壤中有机质含量>土壤pH;土壤中碱解氮含量与材积呈极显著正相关(R=0.8314)。

In order to reveal the effect of environmental factors on the growth of Juglans rnandshurica Maxim, 14 representative sample area of it was selected and the correlation with 14 environmental factors and the growth index of J. mandshurica were analyzed. Result showed that： （1） different stand composition had significant effect on the growth of J. rnandshurica, and diameter growth of J. mandshurica in larch forest was superior to non-larch forest, furthermore, canopy density also had significant effect on tree height of it （R=0.5049）. （2） Slope degree and slope aspect had significant effect on DBH, volume （P〈0.05） and height,DBH, volume （P〈0.01）, respectively, and slope position had significant negative effect on volume （R=-0.5016）. （3） Altitude had positive significant correlation between DBH and volume （R=0.4918, R=0.5203）, while latitude had negative correlation with volume （R=-0.5458）. （4） Soil thickness and alkaline hydrolysis nitrogen content had significant effect on height of it, and the order was as follows： alkaline hydrolysis nitrogen content〉soil thickness; soil organic and pH had significant effect on DBH of it, and the order was as follows： soil organic〉pH; and alkaline hydrolysis nitrogen content had positive significant correction with volume （R=0.8314）.