毛乌素沙地东南部樟子松生长状况调查分析

Investigation and Analysis on the Growth of Pinus slyvestris var. momgolica in Southeast Maowusu Desert Areas

通过对毛乌素沙地东南部樟子松的树高、冠幅、胸径、树龄、分枝层数、总枝数、树干偏度、枯枝数目、枯叶情况、枝下高、轮生枝近地层间距、株行距共12个指标的调查、观测和分析,结果表明:树高、胸径、轮生枝近地层间距、总枝数生长随树龄的增长而增长,它们和树龄的相关系数分别为0.95、0.91、0.72、0.75;树木的高生长、胸径生长和树龄、总枝数、枯枝数、行距都有较大的相关性。樟子松的栽植密度引起空间竞争是树木产生枯枝、枯叶,树皮剥离,树木偏冠的主要原因。株距、行距和冠幅的相关系数为0.96、0.81。大风引起树木周围的温度、湿度和蒸腾以及受力情况改变,进而导致樟子松生长整体不良,出现树木生长弯曲,偏斜。树木的高生长,粗生长和总枝数生长在纯林中比在混交林中快,但是有提早衰退的趋势。混交林虽然生长较慢,但是没有提早衰退的迹象。

12 indices of Pinus slyvestris var.momgolica growing in southeast Maowusu desert areas were measared,such as tree height,crown size,diameter at breast height(DHB),age,the number of ramification layer,the number of total branches,leaning degree of stem,the number of deadwood,withered leaf,hight of the branches near ground,layer space between ring branches near ground,individual plant and row space.The results showed that the growth of tree hight,DHB,layer space between ring branches near ground,number of tot...