SEEDLING DENSITY AND MORTALITY PATTERNS AMONG ELEVATIONS IN SEDUM-LANCEOLATUM
SEEDLING DENSITY AND MORTALITY PATTERNS AMONG ELEVATIONS IN SEDUM-LANCEOLATUM
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DOI：
10.2307/1550987
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发表时间：
1983-01-01
期刊：
影响因子：
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通讯作者：
BOCK, JH
中科院分区：
文献类型：
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作者：
JOLLS, CL;BOCK, JH
在海拔2257~3726 m的7个种群的生长季内，对杉木的苗木密度、更新和存活进行了研究，以评估林线上和林线下的有性繁殖成功的一个方面。苗木密度在林线和林线以上急剧下降，即使修正了种群间成虫密度的差异。幼苗在高山地区的分布如此稀少和斑驳，以至于用随机抽样无法检测到它们。然而，在林线以上，有一些微型立地的苗木密度超过了低海拔，大多数种群的存活率是一致的。高山苗木可以与林线以下的苗木一样成功，这取决于为评估业绩而选择的标准。
Seedling densities, recruitment and survival of S. lanceolatum during the growing season at 7 populations between 2257 and 3726 m were studied to assess 1 aspect of successful sexual reproduction above and below timberline. Seedling densities declined drastically at timberline and above, even when corrections were made for differences in adult densities among populations. Seedlings can be so rare and patchily distributed in the alpine that they could not be detected using random sampling. However, above timberline there were microsites where seedling densities exceeded those at lower elevations and survivorship was homogeneous among most populations. Alpine seedlings can be just as successful as their below-timberline counterparts, depending upon the criteria selected for evaluation of performance.