Handroanthus heptaphyllus （botany synonymy Tabebuia heptaphylla） is considered to have very important economical,ornamental and medicinal value. It is included in the Bignoniaceae botanical family, whose multiplicat...Handroanthus heptaphyllus （botany synonymy Tabebuia heptaphylla） is considered to have very important economical,ornamental and medicinal value. It is included in the Bignoniaceae botanical family, whose multiplication is quite solely carried byseeds. Forest dispersion elements, i.e., the seeds, deserve a deep understanding on their physiological performance. The objective ofthis research work was to determine the optimum seed moisture content for laser interaction in biospeckle tests, which is based onlaser interferometry. Seeds were hydrated to the level of 69% and then divided into four subsamples, i.e., （1） seeds without teguments,（2） seeds with tegument, （3） seeds without teguments frozen at 0 ℃ and （4） seeds with teguments frozen at 0 ℃. The foursubsamples were then separated into five moisture level groups （28%, 35%, 54%, 63% and 69%） and exposed to the laser. Thebiospeckle phenomenon quantification was carried out by means of the moment of inertia （MI） approach. A positive correlationbetween MI and seed moisture content was obtained. It was also verified that seed moisture content between 28% and 54% showedbetter interaction with the laser. The results are important for the application of the biospeckle technique as a possible tool to assessthe quality of purple ipe seeds.展开更多
物种分布模型(Species Distribution Models,SDMs)常被用于评价物种在不同地域的适生概率,但能否用于指导远距离引种栽培仍需试验证明。该研究以黄花风铃木和红花风铃木这两种外来树种为研究对象,对比理论预测结果与实际栽培分布的差异...物种分布模型(Species Distribution Models,SDMs)常被用于评价物种在不同地域的适生概率,但能否用于指导远距离引种栽培仍需试验证明。该研究以黄花风铃木和红花风铃木这两种外来树种为研究对象,对比理论预测结果与实际栽培分布的差异。结果显示:黄花风铃木和红花风铃木的理论适生阈值分别为0.433和0.469,均明显高于栽培样点的最低适生概率。其中,黄花风铃木的预测适生区面积约为7.96×10^(4) km^(2),仅包含4.19%的实际栽培样点,是实际可栽培面积的6.48%。红花风铃木的预测适生区面积约为28.91×10^(4)km^(2),包含71.79%的实际栽培样点,是实际可栽培面积的62.62%。回归分析结果显示土壤pH值、最冷月均温、土壤有机物碳含量对黄花风铃木在中国的适生概率有明显的正影响,而最冷月均温对红花风铃木的适生概率有明显的负影响。该研究证明了物种分布模型在指导远距离引种栽培时可能存在较大误差,并揭示了影响风铃木预测准确度和适应性分布的可能原因。该研究将为物种分布模型的应用优化以及风铃木的栽培选育提供参考。展开更多
文摘Handroanthus heptaphyllus （botany synonymy Tabebuia heptaphylla） is considered to have very important economical,ornamental and medicinal value. It is included in the Bignoniaceae botanical family, whose multiplication is quite solely carried byseeds. Forest dispersion elements, i.e., the seeds, deserve a deep understanding on their physiological performance. The objective ofthis research work was to determine the optimum seed moisture content for laser interaction in biospeckle tests, which is based onlaser interferometry. Seeds were hydrated to the level of 69% and then divided into four subsamples, i.e., （1） seeds without teguments,（2） seeds with tegument, （3） seeds without teguments frozen at 0 ℃ and （4） seeds with teguments frozen at 0 ℃. The foursubsamples were then separated into five moisture level groups （28%, 35%, 54%, 63% and 69%） and exposed to the laser. Thebiospeckle phenomenon quantification was carried out by means of the moment of inertia （MI） approach. A positive correlationbetween MI and seed moisture content was obtained. It was also verified that seed moisture content between 28% and 54% showedbetter interaction with the laser. The results are important for the application of the biospeckle technique as a possible tool to assessthe quality of purple ipe seeds.
文摘物种分布模型(Species Distribution Models,SDMs)常被用于评价物种在不同地域的适生概率,但能否用于指导远距离引种栽培仍需试验证明。该研究以黄花风铃木和红花风铃木这两种外来树种为研究对象,对比理论预测结果与实际栽培分布的差异。结果显示:黄花风铃木和红花风铃木的理论适生阈值分别为0.433和0.469,均明显高于栽培样点的最低适生概率。其中,黄花风铃木的预测适生区面积约为7.96×10^(4) km^(2),仅包含4.19%的实际栽培样点,是实际可栽培面积的6.48%。红花风铃木的预测适生区面积约为28.91×10^(4)km^(2),包含71.79%的实际栽培样点,是实际可栽培面积的62.62%。回归分析结果显示土壤pH值、最冷月均温、土壤有机物碳含量对黄花风铃木在中国的适生概率有明显的正影响,而最冷月均温对红花风铃木的适生概率有明显的负影响。该研究证明了物种分布模型在指导远距离引种栽培时可能存在较大误差,并揭示了影响风铃木预测准确度和适应性分布的可能原因。该研究将为物种分布模型的应用优化以及风铃木的栽培选育提供参考。
