不同坡向对华北落叶松林木生长的影响

目的]研究坡向对华北落叶松林木生长的影响。方法]以北沟林场华北落叶松人工林为研究对象,采用标准地调查法,根据调查资料,选择平均木进行树干解析,研究不同坡向华北落叶松人工林胸径、树高以及材积的变化规律。结果]阴坡和阳坡林分的胸径、树高和材积的生长变化趋势大体一致,阴坡立地条件下胸径、树高和材积均高于阳坡;总体来看阴坡对华北落叶松的胸径和树高均有一定程度的影响,但对材积的平均生长量和连年生长量影响较大,两者在35、30 a时差异最大,最大差值分别为0.001 4、0.003 2 m3。结论]处于阴坡的华北落叶松的胸径、树高、材积生长较阳坡优势明显。

Effects of Different Slope Directions on the Growth of Larix principis-rupprechii

Objective] To study the effect of slope direction on Larix principis-rupprechii forest.Method] The Larix principis-rupprechii of North Ditch Forest Farm was researched as an object with the standard survey method,and the survey based on the investigation data of the Larix principis-rupprechii and chose average tree stem analysis of different slope,to find out the basic characteristics of the growth of individual trees by searching the larch plantation of DBH and tree height and volume variation.Result] The results showed that in shady slope and sunny slope forest,the growth trends of DBH,tree height and volume was generally accordant,shady slope conditions of DBH,tree height and volume were higher than that of sunny slope;generally speaking,the shady slope had a certain extent of influence on DBH,tree height and volume of Larix principis-rupprechii,but volume's average increment and successive increment on the shady slope were significantly greater than on the sunny slope,in 35 or 30 years,the average increment and successive increment of volume on the shady and sunny slope had an obvious difference,which was respectively 0.001 4 m3 and 0.003 2 m3.Conclusion] The Larix principis-rupprechii of DBH,tree height and volume on the shady slope had more obvious advantages than on the sunny slope.