作　　者： ; ;

机构地区： 中山大学生命科学学院有害生物控制与资源利用国家重点实验室

出　　处： 《植物生态学报》 2003年第4期472-476,共5页

摘　　要： 盆栽试验研究了长喙田菁(Sesbania rostrata)-茎瘤固氮根瘤菌(Azorhizobium caulinodans)共生体系在不同水分和无机氮肥条件下的生长、结瘤和氮积累。水分处理为:不浸水、浅浸水(土壤水分为田间持水量)和深浸水,氮肥处理分别为每千克土施加无机氮肥10mg、20mg和40mg。结果表明,水分条件对共生体系有较大影响,浸水环境虽然抑制了根瘤的形成,却促进了茎瘤的结瘤作用和长喙田菁根系的生长,田间持水量状态下共生体系能获得最大的生物量和氮累积量;无机氮肥对共生体系的影响受水分供应的影响较大,实验氮肥施用浓度范围内,长喙田菁的结瘤作用对复合态氮无负敏感反应,明显有别于一般根瘤体系的复合态氮反应。 In order to evaluate the growth, nodulation and N-fixation of Sesbania rostrata-Azorhizobiwn caulin-odans symbiosis on different water and N fertilizer conditions, a greenhouse experiment in Guangzhou was conducted in Summer. Pots were filled with 1 kg homogenized, dried loam red soil. NH^NC^ was applied to obtain concentrations of 10, 20, 40 mg N·kg-1 in the soil. According to water supply to the experimental soil, the pots were divided into three groups as below: W1 - no waterlogging, W2 - shallowly waterlogged ( soil water in field capacity) and W3, - flooded. The results showed that the growth and nodulation of the symbiosis were greatly influenced by water supply. Though flooding depressed root nodulation, it, however, stimulated stem nodulation and roots growth. S. rostrata grew and nodulated best, and got the maximum N accumulation under the condition of field water capacity. The effect of mineral N on the symbiosis was affected by water supply. In the range of the applied N concentrations in the experiment, both nodulation and N accumulation showed no negative reaction to mineral N, such a result implied that S. rostrata-A. caulinodans symbiosis was quite different to ordinary leguminous root nodule N-fixation symbiosis in the aspect of mineral N reaction.

关 键 词： 氮肥 水分 长喙田菁 生长 结瘤 固氮 豆科

领　　域： [生物学] [生物学]