不同开敞度条件下坡向对红松胸径和树高生长的影响

Effect of Aspect on the Diameter at Breast Height and Height Growth of Pinus Koraiensis under the Different Opening Degrees

研究以山河屯、帽儿山和方正三个试验地内红松个体为研究对象,调查研究坡向对次生林林冠下人工栽植红松直径和树高生长的影响。实验结果表明:在各试验地内,在同一坡向条件下,红松平均胸径、平均树高呈现随开敞度的增大而随之增大的趋势,并且差异性显著,当开敞度为2.0时,红松平均树高、平均胸径均高于其他开敞度水平。同一开敞度各试验样地中,南坡和西坡的红松平均胸径、平均树高要大于东坡和北坡,且差异性显著。

The effect of aspect on the diameter at breast height （ DBH） and growth height of plantation Pinus koraiensis trees un-der the canopy in secondary forests in Shanhetun, Maoershan and Fangzheng sites were studied. The results showed that the average DBH and average height of Pinus koraiensis in all experiment sites increased with the increasing opening degree in the same aspect （ P 〈 0. 05 ） , the average DBH and average height of Pinus koraiensisare were higher than those of other opening degree when opening de-gree was 2. 0. The average DBH and average height of Pinus koraiensis in the southern aspect and the western aspect were larger than those in the eastern aspect and northern aspects in the same opening degree in each experiment site（P 〈0. 05）.