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作 者 ：刘国凡,邓廷秀

期 刊 ：生态学报 1991年 11卷 3期 页码：280~285

关键词：刺槐；结瘤；固氮；土壤条件；

Keywords:locust, nodulation, nitrogen fixation, soil condition.,

摘 要 ：刺槐根瘤菌侵染主要是在4—8月份,小瘤形成后,瘤体不断增长,具有较高的固氮活性,7月出现死瘤,冬季一部分死亡,留下部分越冬,次年可继续生长,同时又有新瘤形成:去瘤复栽植株,在4—8月很快能再次结瘤,具有很好的再生能力,8月中旬后去瘤复栽者,当年再生根瘤少,主要在次年春再生,与年周期性的根瘤形成期吻合;固氮活性的季节变化是:4月初随着树叶萌发,活性恢复并迅速增高,夏秋季节保持较高水平,效率一般在6—10微摩尔/克·时,冬季活性很低甚至完全丧失活性,秋季日变化是:上午活性较低而递增较快,下午活性较高而有波状起伏,夜间一直保持较高水平,土壤条件对固氮能力有明显影响,中性、微酸性和弱钙质土固氮量较高,强酸性、强钙质土则低,土壤含水率是影响活性的重要因素;固氮明显促进植株生长。

Abstract:It is mainly from April to August for the locust Rhizobium to infect the plant. After nodulation the nodules kept on growing fine and had higher N2-fixing activity. Their greater part died in winter. After surviving winter the others grew continuously in next year. The plants picked nodules and the replanted plants got a fast renodulation from April to August and showed high power of revivifying nodule. After August renodulation grew few this year until the next spring.Seasonal variation in the N2-fixation ...

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