8种野生地被植物光合及蒸腾耗水特性研究

对华南地区野外资源分布较广且具有一定观赏价值的8种野生地被植物进行冬季和夏季的光合数据采集,并通过计算蒸腾强度分析其节水效益。结果显示:天胡荽、地稔和长萼堇菜日平均净光合速率在冬季显著高于夏季,说明它们为冬季生长优良的地被植物;而链荚豆则在夏季的日平均净光合速率较高,生长较为旺盛。从蒸腾耗水特性来看,地稔在冬季和夏季的单位叶面积日蒸腾总量均较小;在夏季单位时间单位绿化面积内,地稔、三点金、马蹄金、天胡荽和牛轭草的蒸腾量较少,可根据实际情况减少灌溉量。

Research on the Photosynthetic Characteristics and Transpiration Water Consumption of Eight Wild Ground Cover Plants

The research took 8 wild grand cover plants in South China as study objects. They were widely distributed in the wild and had ornamental value. Photosynthetic datum were collected in winter and summer, to research on saving benefits by calculation transpirations. The results showed that: for the daily average net photosynthetic rates,Hgdrocotyle Sibthorpoilides, Melastoma dodecandrum,Viola inconspicuahad high value in winter than in summer, and could be excellent winter growing ground cover plants.Alysicarpus vaginalis had high daily average net photosynthetic rate in summer, and its growth was vigorous. From the viewpoint of transpiration characteristics,Melastoma dodecandrum had small total daily transpiration per unit leaf area in winter and summer. In summer, the evaportranspirations per unit greening area per unit time ofMelastoma dodecandrum,Desmodium triflourum,Dichondra repens,Hgdrocotyle Sibthorpoilides,Murdannia loriformis were small, therefore their irrigation volume could be reduced according to the actual situation.