红马蹄草的生态生物学特征及其扦插繁殖

Ecological and Biological Characteristics and Cutting Propagation of Hydrocotyle nepalensis Hook.

为了解红马蹄草(Hydrocotyle nepalensis Hook.)的生态生物学特征,对其形态解剖特征及光合特性进行了研究。结果表明,红马蹄草叶片较薄,栅栏组织不发达,海绵组织与栅栏组织厚度之比较大;遮荫条件下叶片的净光合速率日变化呈单峰型,具有较低的光补偿点、光饱和点、叶绿素a/b以及较高的表观量子效率、总叶绿素含量、叶绿素b含量,这显示其耐荫特性,对弱光环境的适应能力和利用弱光的能力较强。同时,红马蹄草扦插繁殖迅速,成活率较高,以荫蔽潮湿的生长环境为佳。因此,红马蹄草适合生长在弱光环境中,因其具有较高的观赏价值,是一种值得大力推广的地被植物。

In order to understand the ecological and biological characteristics of Hydrocotyle nepalensis Hook., its morphological and photosynthetic features were studied. The results showed that leaf thickness was about 130.7μm with undeveloped palisade tissue, and the ratio of spongy tissue to palisade tissue was high. The diurnal net photosynthetic rate in leaves was a single peaked curve under shading condition. Meanwhile, H. nepalensis had low light saturation point, light compensation point, chlorophyll a/b and high apparent quantum yield, total chlorophyll content, chlorophyll b, which indicated its strong adaptive capacity and uitilization ability to weak light. The cutting propagation of H. nepalensis had high survival under moist and shady conditions. Therefore, H. nepalensis is suitable to be planted in low light environment. Because of its high ornamental value, this species is an excellent ground cover plant for gardening.