浑善达克沙地东南缘立地条件对樟子松人工林 生长影响研究

Effects of Site Conditions on the Growth of Pinus sylvestris Plantation in the Southeast Edge of Hunshandak Sandy Land

以浑善达克沙地东南缘樟子松人工林为对象,研究了不同立地条件下(平坡地(0~5°)、阳陡坡底(26~35°)、阳陡坡中、坡顶、阴陡坡中、阴陡坡底)樟子松人工林生长状况的变化,为区域人工林抚育和经营提供依据。结果表明:①阳陡坡底樟子松平均株高、胸径、冠幅最大,分别为2.14 m、25.05 mm、108.65 cm;②各立地条件下樟子松节间直径与节间距呈显著负相关(-0.56≤R≤-0.28),节间直径由下至上呈递减趋势,节间距表现为:第二、三、四节间距相对较短,第七节间距最长;③阳陡坡底樟子松株高、胸径、冠幅间呈极显著相关性,相关系数最大,均为0.99。各立地条件下樟子松长势表现为:阳陡坡底﹥阴陡坡中﹥阴陡坡底﹥平坡地﹥阳陡坡中﹥坡顶,以坡顶樟子松长势最差,建议加强坡顶樟子松营林抚育措施。

Taking Pinus sylvestris var.mongolica plantation on the southeast edge of Hunshandak Sandy Land as the research material,the changes of growth status of Pinus sylvestris var.mongolica plantation under different site conditions(flat slope(0~5°),sunny steep slope bottom(26~35°),sunny steep slope,slope top,in the negative steep slope and negative steep slope bottom)were studied,which provides basis for tending and management of regional plantation.The results show that:①The average plant height,DBH and crown width of Pinus sylvestris var.mongolica at the bottom of the sunny steep slope are the largest,which are 2.14 m,25.05 mm and 108.65 cm respectively;②Under each site condition,the internode diameter of Pinus sylvestris var.mongolica was significantly negatively correlated with the internode spacing(-0.56≤R≤-0.28),and the internode diameter decreased from bottom to top.The internode spacing showed that the second,third and fourth internode spacing was relatively short,and the seventh internode spacing was the longest;③There was a very significant correlation among plant height,DBH and crown width of Pinus sylvestris var.mongolica at the bottom of the sunny steep slope,and the correlation coefficient was the largest,which was 0.99.The growth trend of Pinus sylvestris var.mongolica under various site conditions is as follows:sunny steep slope bottom>in the negative steep slope>negative steep slope bottom>flat slope>sunny steep slope>slope crest.Pinus sylvestris var.mongolica grows worst at the top of the slope.It is suggested to strengthen the forest management and tending measures of Pinus sylvestris var.mongolica at the top of the slope.