几种地被植物光能及水分利用特性研究

Study on Light and Water Utilization Characteristics of Several Ground Cover Plants

采用LI-6400光合系统分析仪,研究了7种地被植物的光合生理生态的日变化。结果表明:萱草和蜘蛛兰的净光合速率日变化曲线为单峰,香叶菖蒲、万年青、鸢尾、花叶玉簪、朱顶红的净光合速率日变化曲线为双峰,表现出明显的"午休"现象,净光合速率日均值大小顺序为蜘蛛兰>萱草>香叶菖蒲>鸢尾>花叶玉簪>朱顶红>万年青;蜘蛛兰、鸢尾、花叶玉簪、万年青、香叶菖蒲的蒸腾速率日变化曲线呈单峰,萱草和朱顶红表现为双峰,蒸腾速率日均值大小顺序为蜘蛛兰>萱草>花叶玉簪>香叶菖蒲>鸢尾>朱顶红>万年青;水分利用效率依次为万年青>萱草>蜘蛛兰>香叶菖蒲>鸢尾>朱顶红>花叶玉簪。光能利用效率依次为蜘蛛兰>萱草>香叶菖蒲>朱顶红>鸢尾>万年青>花叶玉簪。综上可知,生长旺季蜘蛛兰、萱草获取光能能力强,吸收CO2量大,对空气的碳-氧平衡贡献比其它地被植物大。万年青、朱顶红、鸢尾、香叶菖蒲调节水分损失的能力及适应干旱环境的能力较强。

Several ground cover plants were researched by LI-6400 potable photosynthesis system. The results were as follows=the net photosynthesis rate diurnal variation curve of Hernerocallis L and Hymenocallis americana were one-peaked, while those of Acorus calamus Linn, Rohdea japonica, Iris tectorum, Hosta planta ginea ＇ Fairy Variegata＇ and Hippeastrurn vittatum （A it. ）Herb were double-peaked. There were obvious sleep-at-moon of these double-peaked plants. Order of day mean value of net photosynthesis rate was Hymenocallis americana 〉 Hernerocallis L〉Acorus calamus L. 〉 Iris tectorum〉 Hosta planta ginea ＇Fairy Variegata 〉 〉 Hippeastrurn vittaturn （Ait.） Herb 〉 Rohdea japonica. The transpiration rate diurnal variation curves of Hymenocallis americana, Iris tectorum, Hosta planta while those ginea ＇Fairy Variegata＇, Rohdea japonica and Acorus calamus Linn were one-peaked, of Hemerocallis L and Hippeastrurn vittaturn（Ait. ）Herb were double-peaked. Order of transpirationrate day mean value was Hymenocallis Americana 〉 Hemerocallis L〉 Hosta planta ginea ＇ Fairy Variegata＇ 〉 Acorus calamus L. 〉 Iris tectorurn 〉 Hip peastrurnvittatum（ Ait. ）Herb 〉 Rohdea japonica. Order of water use efficiency was Rohdea japonica 〉 Hemerocallis L 〉 Hymenocallis americana 〉 Acorus calamus L. 〉 Iris tectorum 〉 Hippeastrum vittatum （Pdt. ） Herb 〉 Hosta planta ginea ＇Fairy Variegata＇. Order of light use efficiency was Hymenocallis americana〉 Hemerocallis L〉 Acorus calamus L. 〉 Hippeastrum vittatum（Ait. ）Herb 〉 Iris tectorum 〉 Rohdea japonica 〉 Hosta planta ginea ＇Fairy Variegata＇. In rapid growth season, the ability of Hymenocallis americana and Hernerocallis L to make organic matter or absorb the carbon ioxide or contribute to keep the balance of carbon-oxygen were higher than others. To adjust waterlossed and adapt the dry environment, Acorus calamus L. , Iris Tectorum , Hippeastrum vittatum （A it. ）Herb and Rohdea japonica were more effective than others.