白音锡勒草原沙地云杉林的性质、可能成因及自然更新能力的初步研究

本文对内蒙古白音锡勒草原沙地白杆 (Picea meyeri)种群的大树和幼树及伴生植物进行了初步研究 ,认为沙地白杆林是在近极限生境条件下 ,由适应性不同的植物种依生境异质性组合而成的疏林群落。是第三纪云杉属植物广布分布区的残存片段 ,也是白杆现代分布区的北界。白杆种群现有大树 3 3 0株 ,幼树 1 62 9株。大树的死亡率随胸围增大而增高 ;幼树则每增加一个龄级死亡 48.7%。该种群具有自然更新的能力。由于生境相对严酷 ,种群较小 ,局部灭绝的危险尚不能排除。

Preliminary Study on Properties,Probable Causes And Capacity for Natural Regeneration of Picea meyeri Forest on Sandy Land in Baiyinxile

In this paper, Picea meyeri population on Baiyin xile sandy land and their companion plants were studied, and were concluded that the forest grows in a habitat being on the verge of limitation, that the forest is in a form of open forest, that is combined with plant species with different adaptability by habitat heterogeneity, that is a surviving fragment of the extensive distribution area in Teritary, and that forms a northern border of living distribution area of the species. The population has 330 trees, and 1629 yong trees ; and the trees’ mortality increases with the increase of the classes of perimeter breast high; and the mortality of yong trees is 48.7% with an increase of age class. The population has the capacity for natural regeneration. This population has a potential danger of local extinct because of the harsh condition and the small population.