EFFECTS OF SNOW-FREE PERIOD ON THE PHENOLOGY OF ALPINE PLANTS INHABITING SNOW PATCHES
EFFECTS OF SNOW-FREE PERIOD ON THE PHENOLOGY OF ALPINE PLANTS INHABITING SNOW PATCHES
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DOI：
10.2307/1551685
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发表时间：
1991-11-01
期刊：
影响因子：
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通讯作者：
KUDO, G
中科院分区：
文献类型：
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作者：
KUDO, G
根据无雪期的时间跨度，通过沿融雪梯度设置6个样方，对高山植物物候特征进行了研究。在56种中，有17种居住在4个或4个以上样方，1988 ~ 1990年对其物候进行了3年的观察。无雪期的缩短降低了开花和出苗率。高山植物物候主要受(1)生长形式、(2)花期长短和(3)种子成熟期的控制。灌木物种，尤其是常绿灌木，需要更长的时间来成熟它们的种子。它们放弃有性繁殖，在短暂的无雪栖息地分层繁殖。Forb和graminoid甚至在短时间无雪的栖息地开放。在这些短暂的无雪栖息地，一些禾本科植物的叶子习性从夏绿转变为半常绿。这被认为是延长光合作用期的一种策略。
Phenology of alpine plants was studied with reference to the time span of snow-free period by setting six quadrats along a snowmelt gradient. Of the 56 species, 17 inhabited four or more quadrats and their phenology was observed for 3 yr, 1988 to 1990. Contraction of the snow-free period reduced flowering and seeding rates. Phenology of the alpine plants was controlled primarily by (1) growth form, (2) the span of preflowering, and (3) the term for the maturity of seeds. Shrub species, especially evergreen shrubs, took longer for maturing their seeds. They abandoned sexual reproduction and reproduced vegetatively by layering in the short snow-free habitats. Forb and graminoid species opened their flowers even in the short snow-free habitats. Some graminoid species shifted their leaf habit from summergreen to semievergreen in these short snow-free habitats. This is considered a strategy to extend the photosynthetic period.