不同生态区若干典型作物土壤中紫花苜蓿土著根瘤菌分布状况

Distribution status of indigenous Rhizobium meliloti in the soil of typical crop fields in different ecological areas

采用根瘤菌接种技术可以保证苜蓿成功建植、提高苜蓿产量和改善苜蓿品质,有关效果受施用区土著菌影响较大。应用MPN法对我国多种土壤进行苜蓿土著菌分布状况研究,结果表明:除个别土壤外,苜蓿土著菌数量为30～3000个/g;黄土高原典型作物土壤中根瘤菌数量为2 5万～45万个/g。可见,在典型作物地土壤及有关土壤类型区,土著菌数量较低,根瘤菌接种技术是此类地区发展苜蓿种植的重要技术。

Inoculation of alfalfa with Rhizobium meliloti can assure successful establishment,increase yield and improve crop quality Effects are considerably influenced by the presence of indigenous rhizobial populations The MPN (most probable number) method was applied to study the distribution of indigenous Rhizobium meliloti in different soil in China The size of most indigenous rhizobial populations ranged from 30～3 000 rhizobia/g On the Loess Plateau, population size ranged from 25×104～45×105 rhizobia/g From these results it can be seen that in typical crop soil and areas with related soil types, indigenous rhizobium populations are quite low Rhizobium inoculation is an important technology in the development of alfalfa growing in these areas