不同坡位马尾松人工林的生长差异研究

Study on Growth Differences of Pinus Massoniana Plantation at Different Slope Positions

对不同坡位之间16年生的马尾松(Pinus massonianalamb.)人工林进行了生长差异分析,结果表明:不同坡位之间胸径、树高和单株材积均值均有极显著差异。下坡位种植的马尾松生长情况最佳,中坡位次之,上坡位最差,各指标均值随坡位的上升而下降。上坡位的植株个体之间分化较大,随坡位下降个体之间分化程度降低。下坡位胸径均值为22.81cm,分别比中坡位与上坡位高12.62%和20.61%;下坡位树高均值为13.28m,分别比中坡位与上坡位高4.01%和9.87%;下坡位单株材积均值达0.2978m2,中坡位与上坡位的单株材积分别为0.2003m2和0.1265m2,下坡位的单株材积分别比中坡位与上坡位的下降32.72%和57.53%。

The article analyzes the growth differences of 16a Pinus massoniana plantation at different slope positions . The results show that there are significant differences in DBH ,tree height and individual volume at different slope positions .The growth at downslope is the best ,then following by the mid -slope and uoslope .These indexes are significantly decreasing along with the rising of slope position .Differentiation at upslope is greater ,but with the decrease of slope ,the degree of differentiation decreases .The average DBH at downslope is 22 .81 cm ,which is larger than that at id -slope and upslope by 12 .62% and 20 .61% respectively ;The average tree height at downslope is 13 .28m ,w hich is higher than that at mid -slope and upslope by 4 .01% and 9 .87% respectively ;T he average individual volume at upslope ,mid -slope and upslope is respectively 0 .1265m3 ,0 .2003m3 and 0 .1265m3 ,which show s that the individual volume at dow nslope decreases by 32 .72% and 57 .53% respectively compared to that of mid-slope and dow nslope .