Nodulation of tree legumes and the ecology of their native rhizobial populations in tropical soils
Nodulation of tree legumes and the ecology of their native rhizobial populations in tropical soils
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DOI：
10.1016/s0929-1393(02)00157-9
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发表时间：
2003-03-01
影响因子：
4.8
通讯作者：
Giller, KE
中科院分区：
文献类型：
--
作者：
Bala, A;Murphy, PJ;Giller, KE
只有当土壤中存在兼容的根瘤菌时，引入新地区的豆科植物才会形成根瘤并固定氮素。利用采自非洲、亚洲和拉丁美洲热带地区的25种(田菁为60种)土壤，研究了4种农林复合树种(Calliandra calothyrsus、Gliricidia Sepium、银合欢Leucaena Leucocephala和S.Sesban)的结瘤情况、它们与当地根瘤菌种群的共生作用以及根瘤菌种群动态的一些生态指标。豆科植物估计的根瘤菌种群大小从无法检测到的数量到每克土壤3.16×10(4)个细胞不等，具体取决于诱捕寄主物种。接种试验表明，虽然白头翁在供试土壤中的结瘤率最高，但L是混交最多的物种，而毛壳藻则是最有效的共生物种。在结瘤和共生效果方面，以芝麻最为专一。共生效率与特定的土壤参数没有密切关系，但根瘤菌数量与土壤酸度、颗粒大小和交换性盐基高度相关。土壤酸度也是影响根瘤菌种群遗传多样性的主要因素。(C)2002 Elsevier Science B.V.保留所有权利。
A legume introduced into a new area will only form nodules and fix nitrogen if compatible rhizobia are present in the soil. Using 25 (60 in the case of Sesbania sesban) soils sampled from tropical areas of Africa, Asia and Latin America, we examined the nodulation of four agroforestry tree species (Calliandra calothyrsus, Gliricidia sepium, Leucaena leucocephala and S. sesban), their symbiotic interactions with the native rhizobial populations, and some of the ecological indicators of rhizobial population dynamics. Rhizobial population sizes estimated by the legume species ranged from undetectable numbers to 3.16 x 10(4) cells per g of soil depending on the trap host species. Although C calothyrsus had the highest nodulation rate in the soils used, inoculation tests showed L leucocephala to be the most promiscuous species while G. sepium had the most effective symbiosis. S. sesban was the most specific for both nodulation and symbiotic effectiveness. Symbiotic effectiveness did not bear any close relationship with specific soil parameters, but rhizobial numbers were highly correlated with soil acidity, particle size and exchangeable bases. Soil acidity was also the main factor that was highly correlated With genetic diversity among the rhizobial populations. (C) 2002 Elsevier Science B.V. All rights reserved.