九龙江口红树林鹧鸪菜藻体自生固氮细菌

Abiogenous azotobacter on the body of Caloglossa leprieurii growing in Kandelia candel mangrove forest in Jiulongjiang estuary of Fujian Province

初步研究了福建九龙江口秋茄(Kandelia candel)红树林红藻鹧鸪菜(Caloglossa leprieurii)藻体异养自生固氮菌数量的季节变化和微生物区系。结果表明:鹧鸪菜上异养自生固氮细菌数量以春季最多(1.033×104cfu.g-1),冬季最少(0.567×104cfu.g-1),固氮菌的季节变化模式表现为春季>秋季>夏季>冬季;鹧鸪菜藻体氮含量也以春季最高(22.08g.kg-1),冬季最低(16.63g.kg-1),二者差异显著(P<0.05),且藻体含氮量的季节变化模式与固氮细菌数量一致;这与鹧鸪菜的生长和物质积累密切相关,鹧鸪菜与其藻体上的自生固氮菌可能存在着互惠互利的关系,这种关系同时也受到环境温度和水分等因子的综合影响;对9株固氮菌的初步鉴定结果显示,它们分属于固氮菌属(Azotobacter)与拜叶林克氏菌属(Beijerinckia)。

The study on the seasonal changes of heterotrophic abiogenous azotobacter on the body of Caloglossa leprieurii growing in the Kandelia candel mangrove forest in Jiulongjiang estuary indicated that the quantity of this kind of azotobacter was the most in spring （ 1. 033 × 10^4 cfu · g^-1 ） and the least in winter （0. 567 × 10^4 cfu · g^-1 ） , with a seasonal pattern of spring 〉 autumn 〉 summer 〉 winter. The nitrogen concentration of C. leprieurii also had the same seasonal pattern, being the highest in spring （ 22.08 g · kg^-1 ） and the lowest in winter （ 16. 63 g · kg^-1 ）, which was closely related to the growth and matter accumulation of the seaweed. There was probably a kind of special cooperative relation between the azotobacter and the seaweed, which was influenced simultaneously by the environmental factors such as temperature, water, and others. The preliminary identification of isolated nine strains azotobacter showed that they were belonged to Azotobacter or Beijerinekia.