| 氮肥和水分条件对长喙田菁生长、结瘤和固氮的影响 |
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| 引用本文： | 袁剑刚,杨中艺.氮肥和水分条件对长喙田菁生长、结瘤和固氮的影响[J].植物生态学报,2003,27(4):472-476. |
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| 作者姓名： | 袁剑刚 杨中艺 |
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| 作者单位： | 中山大学草业与绿地技术研究中心//生物防治国家重点实验室,广州,510275 |
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| 基金项目： | 国家“863”计划(2001AA645010)，国家自然科学基金(30070126、30270262) |
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| 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10 mg、20 mg和40 mg。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。
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| 关 键 词： | 长喙田菁 茎瘤固氮根瘤菌 水分 氮肥条件 |
| 修稿时间： | 2002年7月3日 |
EFFECTS OF N FERTILIZER AND WATER CONDITION ON GROWTH, NODULATION AND N-FIXATION OF SESBANIA ROSTRATA-AZORHIZOBIUM CAULINODANS SYMBIOSIS |
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| YUAN Jian-Gang and YANG Zhong-Yi.EFFECTS OF N FERTILIZER AND WATER CONDITION ON GROWTH, NODULATION AND N-FIXATION OF SESBANIA ROSTRATA-AZORHIZOBIUM CAULINODANS SYMBIOSIS[J].Acta Phytoecologica Sinica,2003,27(4):472-476. |
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| Authors: | YUAN Jian-Gang and YANG Zhong-Yi |
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| Abstract: | In order to evaluate the growth, nodulation and N-fixation of Sesbania rostrata-Azorhizobium caulinodans 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. NH4NO3 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. |
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| Keywords: | Sesbania rostrata Azorhizobium caulinadans Water supply N fertilizer Stem nodule N-fixation |
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