滨豇豆的生态生物学特征

Ecological and Biological Characteristics of Vigna marina

摘要:

为探究滨豇豆（Vigna marina）的生态生物学特性及其对热带珊瑚岛的适应性，对西沙群岛野生滨豇豆的叶片形态解剖结构、生理特征和营养成分进行了分析。结果表明，滨豇豆具有叶片厚、比叶面积小、栅栏组织发达、气孔密度大、气孔面积指数大等形态特征，对减少蒸腾、保持水分起到重要作用。滨豇豆叶片的SOD活性和脯氨酸（Pro）含量高，丙二醛（MDA）含量低，表明抗氧化能力较强；滨豇豆叶片养分含量适中但其生境土壤养分含量很低，说明其对养分有着良好的吸收利用能力，利于适应贫瘠的环境。因此，滨豇豆具有能够较好地适应珊瑚岛礁高温、干旱、贫瘠生境的形态解剖结构和生理特征，加之其具有良好的固氮和养分利用能力，可作为热带珊瑚岛植被恢复的工具种。

Abstract:

In order to understand the bio-ecological characters of Vigna marina and its adaptability to the tropical coral island, the anatomical structure, physiological characteristics and nutritional components of the leaves were studied. The results showed that V. marina had thick leaves, low SLA, well-developed palisade tissue, high stomatal density and high stomatal area index, which played an important role in decreasing transpiration and maintaining moisture. The SOD and POD activities in leaves were high, while the MDA content was low, showing strong antioxidant capacity. The content of nutrients in leaves of V. marina was moderate, but that in soil was low, indicating that V. marina had a good ability to absorb and utilize nutrients, which was beneficial to adapt to the barren environment. Therefore, Vigna marina can adapt well to the habitat of high temperature, drought and high salinity. It can be used in wind-break, sand-fixation and vegetation restoration in tropical coral islands.