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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。
In this paper, the primary and secondary trees and saplings of the Picea meyeri population in the Baiyinxile grassland of Inner Mongolia were studied. The results showed that under the near-limit habitat conditions, Plant species by habitat heterogeneity combination of sparse forest community. It is the remnant fragment of the widespread area of Tertiary Picea and also the northern boundary of the modern distribution area of white bar. There are 330 large trees and 1 629 saplings in the white-striped population. The mortality rate of large trees increased with the increase of the bust, while the saplings died 48.7% of each additional age class. The population has the capacity of natural regeneration. Owing to the relatively harsh habitat and the small population, the danger of local extinction can not yet be excluded.