兴安灵渠大、小天平坝腰铁考证

笔者通过对腰铁工艺的兴起和发展历史的探究,并结合对灵渠大、小天平坝进行考古调查时观察了解到的地层堆积状况以及历代灵渠兴修扩建的文献记录,经过综合分析,初步了解了明清时期修缮灵渠的技术特点,确定灵渠大、小天平坝上采集的腰铁锭的年代问题以及施工工艺,有助于深化学界对灵渠的石材修建技术特点、广西和西南地区古建筑和水利工程技术发展史以及灵渠稳固、沟通西南边陲的历史作用的研究,对灵渠的人文、历史、科研价值进行了更深层次的挖掘。

Distribution of Fe, Mn and Cu Contents in Cashew Leaves

[Objective] The aim was to find out the distribution of Fe, Mn and Cu contents in cashew leaves. [Method] Using the cashew orchard with stable yield in Hainan as the objects, the sampling sites were arranged systematically, and all leaf samples were collected during the annual growth period, so as to analyze the con- tents of trace elements of Fe, Mn and Cu in cashew leaves, as well as to clarify the distribution rules of Fe, Mn and Cu contents in cashew leaves. [Result] The contents of Fe, Mn and Cu in cashew leaves were related with the annual growing period that in October, when the growth of cashew tree became active to accumu- late nutrients for the following bud differentiation and fruit growth, the contents of trace elements in the leaves increased gradually, while in March of the next year, when the fruit-setting consumed a large amount of nutrients, the contents of trace elements in the leaves decreased gradually. [Conclusion] This study provided ideas for the management of nutrients in cashew.

永定河文化遗产研究的新进展

永定河历史悠久,遗产丰富。近些年来,陆续又有10余处遗址被发现。随着科学技术的进步,研究手段更加有力,获得了新认识,并揭示了5项遗产内涵的科技性能。