【摘要】 为了探明四川省巨桉人工林地土壤微生物类群的生态分布情况,本文研究了洪雅县巨桉人工林地土壤微生物细菌、放线菌和真菌的类群数量和类群组成。结果表明巨桉人工林地细菌生理类群数量巨大,最多时达到6·996×106个/g,组成合理,类群丰富,有一定的季节变化,总体上以好气性固氮菌、根瘤菌、氨化细菌和有机磷分解菌为细菌优势种群;同农耕地和青冈次生林地相比,有明显的数量和种类组成的优势。巨桉人工林地放线菌90%以上是链霉菌属,链霉菌属各组成类群特点为数量大,种类全,且有一定的土壤层次变化。巨桉人工林地真菌的种类不多,青霉属和曲霉属在所有样地和土层中都有出现,且为所有样地和土层的优势种群。巨桉作为优良的退耕还林(草)工程和脆弱生态系统恢复树种,表现出良好的生态效益。更多还原

【Abstract】 To investigate the ecological distribution regulations of soil microbes group in Eucalyptus grandis plantation, the amount and group distribution of soil microbes including bacteria, fungi and actinomycetes were studied in 2004 in Eucalyptus grandis plantation of Hongya county. With the traditional culturing approaches, the dominant of microorganisms was researched. The results show that the dominant population of bacterial physiological groups is the genus of Aerobic nitrogen fixing bacteria, Rhizobia, Ammonifying bacteria, Organic phosphorus-decomposing bacteria in Eucalyptus grandis plantation, that of actinomycetes was Genus streptomyces (over 90%) and the dominant fungal genera are Penicillium and Aspergillus. The Eucalyptus grandis plantation as a kind of tree for the Cropland Conversion to Forest and Grassland (CCFG) has a good ecological and economic benefit.更多还原