Seed germination of a tropical rain forest pioneer tree (Heliocarpus donnell‐smithii) in response to diurnal fluctuation of temperature
Seed germination of a tropical rain forest pioneer tree (Heliocarpus donnell‐smithii) in response to diurnal fluctuation of temperature
复制标题
热带雨林先锋树（Heliocarpus donnell-smithii）种子萌发对昼夜温度波动的响应
DOI：
10.1111/j.1399-3054.1982.tb00341.x
复制
发表时间：
1982
影响因子：
6.4
通讯作者：
A. Orozco
中科院分区：
文献类型：
--
作者：
C. Vázquez;A. Orozco
热带雨林的先锋树Heliocarpus donnell-smithii Rose只在森林树冠的光隙中建立自己。一系列温度波动的实验表明，如果每天有几个小时的温度上升到31°C以上，发芽率就会增加。实验室实验的补充与测定的种子在土壤中的生活力，每个月在一年中，并与发芽的测定下的自然昼夜变化的温度在林隙。在温度波动的情况下，发芽率会增加，种子在埋在土壤中的几个月内可以保持休眠状态。与几乎恒定的温度下不受干扰的冠层的光隙的土壤的昼夜加热可能是一个精确的环境指标的萌发和建立的先锋的热带雨林的阳生植物的适当条件。
The tropical rain forest pioneer tree Heliocarpus donnell-smithii Rose establishes itself only in light gaps of the forest canopy. A series of experiments with fluctuating temperatures have shown that the germination is increased if the temperature rises above 31°C during a few hours each day. The laboratory experiments were complemented with determinations of the seed viability in the soil each month during one year, and with determinations of germination under the natural diurnal fluctuation of temperature in a forest gap. Germination increases under fluctuating temperatures, and the seeds can remain dormant when buried in the soil during several months. The diurnal heating of the soil of light gaps as contrasted with the almost constant temperature under undisturbed canopies may be a precise environmental indicator of appropriate conditions for germination and establishment of the pioneer heliophytes of the rain forest.