La temperatura como principal determinante de la germinación en especies del Chaco seco de Argentina
La temperatura como principal determinante de la germinación en especies del Chaco seco de Argentina
复制标题
温度是阿根廷查科地区物种萌发的主要决定因素
DOI：
--
复制
发表时间：
2009
期刊：
影响因子：
--
通讯作者：
Paula Venier
中科院分区：
文献类型：
--
作者：
Guillermo Funes;S. Díaz;Paula Venier
温度是决定阿根廷干查科树种发芽的主要因素：温度是决定查科林地树种发芽的主要因素。植物物种组成是在不同的空间和时间尺度上运作的过程的结果。在群落中共存的物种受到环境因素的影响，这些因素会影响一年中种子萌发和幼苗出现的时间，从而最大限度地提高建立和生存。在这项研究中，我们调查了温度和光照对种子萌发的影响，在阿根廷中部的查科林地常见的各种植物物种。选择了25种被子植物，涵盖了广泛的生活型。实验处理是三种温度制度（15/5 °C、25/15 °C和35/20 °C），在光照（每天12/12小时光周期）和连续黑暗中。温度是影响种子萌发的主要因素，大多数种子对光照不敏感。我们的研究结果支持的想法，种子发芽与该地区的降雨的高度季节性。
Temperature as a main factor determining germination in Argentinean dry Chaco species: Temperature is a main factor determining germination in Chaco woodland species. Plant species composition is the result of processes that operate at different spatial and temporal scales. Species that coexist in a community are affected by environmental factors that influence the periods of the year when seed germination and seedling emergence occur, thus maximising establishment and survival. In this study we investigated the effects of temperature and light on seed germination of a wide range of plant species common in the Chaco woodlands of central Argentina. Twenty five species of angiosperms were selected, covering a wide range of life forms. Experimental treatments were three temperature regimes (15/5 °C, 25/15 °C and 35/20 °C) in light (12/12 h daily photoperiod) and in continuous darkness. Temperature was the main factor triggering the germination and most species were indifferent to light. Our results support the idea that seed germination is associated with the highly seasonal nature of rainfall in this region.