铁兰属5种植物花粉微形态的扫描电镜观察

在扫描电子显微镜下观察了5种铁兰属植物花粉的微形态,结果表明：铁兰属植物花粉的微形态具有一定的共性,即都具有1个萌发沟,花粉外壁都具网纹纹饰,说明铁兰属植物是自然类群中较进化的类群。根据花粉形状的不同,推测松萝铁兰(Tillandsia usneoides)可能是铁兰属中较原始的种。铁兰属不同种在花粉大小、网孔形状、网孔间距等情况有较大的差异,这些花粉表面微观形态的差异可为种的分类提供依据。     

Seasonality and abundance of Metamasius callizona (Coleoptera: Dryophthoridae), an invasive insect herbivore,on two species of Tillandsia (Bromeliaceae) in Florida

Seasonality and abundance of an insect herbivore population are regulated by a complex array of forces from the bottom up, from the top down, and from competition and the environment. This paper examines the effect that two host plants have on an insect herbivore in the absence of top‐down regulation or competition. Metamasius callizona is an invasive bromeliad‐eating weevil in south Florida that has escaped its natural parasitoid in its home range. A 4‐year field study shows the weevil to be present and active year‐round, but to exhibit different patterns of seasonality and abundance on two of its host plants. It is argued that this demographic variability is generated by the differences in leaf type and growth habit that exist between the two host plants.     

松萝凤梨植物窗帘辐射特性

通过对松萝凤梨特性的分析,提出利用无根无土的松萝凤梨编织成一种新型植物窗帘,使其既具有植物遮阳的优势,又避免了常规垂直绿化遮阳的缺陷,同时实现与普通遮阳材料一样的操控便捷,是一种性能优良的天然太阳辐射控制器.采用分光光度计测试方法对松萝凤梨叶片全波长范围内的辐射特性进行了测定,得到松萝凤梨叶片的吸收率为0.64,反射率为0.36,透射率为0,推荐松萝凤梨叶片的长波辐射吸收率取为0.83.研究结果表明,采用叶片拼接法测试较小叶片的辐射特性是可行的.以此为基础,建立了松萝凤梨植物窗帘辐射特性计算模型,不同密度的松萝凤梨植物窗帘的吸收率、反射率、透射率由植物窗帘密度和松萝凤梨叶片辐射特性共同决定.