14种耐荫植物对兰州市特殊空间的适应性研究

通过对引种栽培在兰州市特殊空间生态环境的14种耐荫植物的叶绿素和膜脂过氧化指标—丙二醛(MDA)含量的测试研究。结果表明,(1)兰州市城建绿化引进栽培的14种耐荫植物的耐荫能力均有所提高;在本地耐荫能力强弱的顺序是:藤本植物为小叶扶芳藤、金银花、五叶地锦、中华常春藤、三叶地锦、鹅绒藤;地被植物为宽叶麦冬、八宝景天、蓍草、玉簪、小冠花、紫花地丁、松塔景天、德国景天。(2)叶绿素a/b值是高原地区界定和评价植物耐荫性强弱的最为可靠和准确的直接指标;a/b值的大小与MDA含量的高低呈正相关,是抗逆性指标中最重要的参数。

A Study on the Adaptability of Fourteen Types of Shade-tolerance Plants in the Special Space in Lanzhou City

The contents of chlorophylls and malondialdehyode(MDA) contained in the leaves of 14 shade-tolerant plant species introduced in Lanzhou were measured to study their adaptabilities.The results were as follows.(1)The shade tolerance of plants introduced in the Lanzhou city all increased,the shade tolerance of vine was in the order of Euonymus forthunei var.radicans> Lonicera japonica >Parthenocissus quinquefolia > Hedera nepalensis var.sinensis> P.tricuspidata> Cynanchum Chinense;the shade tolerance of ground cover plants was in the order of Liriope platyphylla> Sedum spectablile cv.carmen> Achillea sibirica> Hosta plantaginea> Coronilla varia> Viola philippica> Sedum necaense> Gynura segetum.(2)The ratio of chlorophyll a and b(a/b)was an accurate and direct parameter to evaluate the plant shade-tolerance in the area of plateau;the a/b values showed positive correlation with the content of MDA.