LIGHT ENVIRONMENTS IN TEMPERATE NEW ZEALAND PODOCARP RAINFORESTS
LIGHT ENVIRONMENTS IN TEMPERATE NEW ZEALAND PODOCARP RAINFORESTS
复制标题
新西兰温带罗汉松雨林的光环境
DOI：
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发表时间：
1992
影响因子：
1.6
通讯作者：
D. Norton
中科院分区：
文献类型：
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作者：
D. Mcdonald;D. Norton
摘要：使用量子传感器的数据描述了两个低地新西兰的罗汉果雨林的光环境。林下平均日总光合光子通量密度（PPFD）夏季变化为2.6-5.2%，秋季变化为1.0-2.5%，林窗夏季变化为5.0-16.6%，秋季变化为6.3-8.3%。明显的差异，在林下PPFD发生在晴天和阴天。与晴天相比，阴天有较低比例的2分钟时段具有非常低的平均PPFD。在夏季，37.791.7%的PPFD发生在日照，但这些发生的时间只有4.0-27.9%。大多数日照时间很短（42.2-72.7%在夏季少于4分钟），但有些很长（>32分钟）。总的来说，光环境与新西兰和其他地方的其他森林相似。然而，冠层结构有显着的影响，在森林内的光环境的空间分布，和冠层干扰的大小和频率的差异是一个促成因素的两个森林之间的植物区系差异的研究。
Summary: Light environments in two lowland New Zealand podocarp rainforests are described using data from quantum sensors. Mean daily total photosynthetic photon flux density (PPFD) in the forest understorey varies from 2.6-5.2% incident PPFD in summer and 1.0-2.5% in autumn, and in gaps from 5.0-16.6% in summer and 6.3-8.3% in autumn. Pronounced differences in understorey PPFD occur between clear and overcast days. Overcast days tend to have a lower proportion of 2-minute periods with very low mean PPFD than clear days. In summer, 37.791.7% of PPFD occurs as sunflecks, but these only occur for 4.0-27.9% of the time. Most sunflecks are short duration (42.2-72.7% less than 4 minutes in summer) but some are very long (>32 minutes). Overall, light environments are similar to those found in other forests, both in New Zealand and elsewhere. However, canopy structure has a pronounced influence on spatial distribution of light environments within a forest, and differences in the size and frequency of canopy disturbances are a contributing factor to the floristic differences between the two forests studied.