金钟藤的快速生长和强光合能力

Fast Growing and High Photosynthetic Rate of Merremia boisiana(Gagn.) Ooststr

金钟藤在广州市郊造成危害。为了掌握其生物学特性,测定了其枝条的生长,比较了与伴生种的光合作用强度,监测了幼苗的出现。金钟藤强枝在生长季平均每天长9.5 cm,最快达16.6 cm,且能产生新枝;弱枝在6周内枯萎且无新枝产生。金钟藤的最大净光合速率和光饱和点高于伴生的月光花、野葛,也高于入侵杂草薇甘菊。从12月花果期至次年8月未见幼苗生长。因此,金钟藤具有入侵种的高光合能力和快速生长特征,必须密切关注,但其扩散主要靠营养生长,具有潜在的应用前景。

Merremia boisiana （Gagn.） Ooststr caused characteristics, the growth of stems and photosynthesis damages on Guangzhou suburb. To reveal its biological rate of Merremia boisiana and its companion species were measured, and the emergence of its new individuals were monitored. During a growing season, a strong shoot grew 9.5 cm/d while the fastest reached 16.6 cm/d and produced new shoots ; a week shoot died in 6 weeks and no any new shoot appeared. The light saturated point and maximal net photosynthetic rate of M. boisiana were higher than those of Calonycion aculonyction, Pueraria lobata and Mikania micrantha. No seedlings appeared from fruiting month in December until August in the next year. These indicated that M. boisiana possessed fast growing ability and high photosynthesis rate of invasive species. Therefore, close attention is needed. However, its expansion ability heavily limited by vegetative growing, thus it has a potential of being utilized.