北方寒地草场土壤中苜蓿根瘤菌分布状况研究

摘要

根瘤菌接种效果受到施用地土壤中上著根瘤菌数量地影响。用MPN法对大庆地区不同北方寒地草场多种土壤进行了土著苜蓿根瘤菌数量分布状况研究，结果表明：在非苜蓿种植区，土著苜蓿根瘤菌数量为100～10000个／g，在苜蓿种植区上壤中数量为10～300万个／g。可见，北方寒地草场上壤中土著苜蓿根瘤菌含量较低，根瘤菌接种技术是此类地区发展卣蓿种植业的一项重要技术。%The effect of Rhizobium inoculation applied to the soil is influenced by the number of indigenous rhizohia. MPN method was used to research the number of indigenous Rhizobium meliloti distribution in a variety of cold grassland soil in different regions of Daqing. Results showed that： in the non-alfa-gruwing area, the number of indigenous Rhizobitun meliloti was 100 to 10 000 / g, while in the alfalfa-growing area, the number of was 100.000 to 3 million/g. Ohviously, cold northern grassland soils have low levels of indigenous Rhizobium meliloti and Rhizohium inoculation is an important altalht farminng technology for the development of alfalfa growing for sueh areas.