Aims

 选取尖叶泥炭藓(Sphagnum capillifolium)为试验材料, 在模拟水位与光强条件下, 对人工构建的苔藓植物群落进行室内培养, 每隔1-3天观察并记录植株高度、孢蒴变化过程及变化时间, 分析了不同水位与光强条件对孢蒴生产的植物功能属性动态的影响。水位上升促进了蒴柄伸长及植株高增长, 增加了孢蒴开裂率及遮蔽率。光强增加有助于孢蒴生长, 并提高了孢蒴开裂率。在孢蒴直径以及植株高增长性状上, 水位与光强存在交互作用。水位与光强对孢蒴增长率均没有影响。此外, 水位升高与光强增加使孢蒴成熟及蒴柄伸长时间提前, 总体上使孢子释放时间分别提前了4.0 d和4.8 d, 由此可能减小了孢子体因受夏季干旱影响而败育的风险。孢子释放后, 繁殖株高增长加速, 可为未来的再次繁殖奠定基础。

Effects of water level and light intensity on capsule production dynamics of Sphagnum capillifolium

Aims Our objective was to analyze the effect of water levels and light intensities on capsule production dynamics of Sphagnum to lay the foundation for further research on its reproductive phenology. Methods Our selected Sphagnum capillifolium in this study. We set up a simulation experiment within a growth chamber and grew moss communities in polystyrene containers. Water levels and light intensities were altered to create different environmental conditions. Gametophores and capsule production were observed and recorded. Important findings Seta length, shoot height and capsule cracking rate increased when water level increased. Under high light intensities, capsule diameter and capsule cracking rate were higher. Water level and light intensity had an interactive effect on shoot height increment and capsule diameter. Water level and light intensity had no effect on capsule production rate. Increase in both water level and light intensity led to earlier spore release. Reproductive phenology advance can reduce the abortive risk of spores by avoiding detrimental environment conditions such as drought. After capsules dehisced, reproductive shoots were able to accelerate height growth to avoid shading to lay a foundation for further reproduction in the future.