【摘要】 研究我国冷浸田主要分布的7个省份冷浸田土壤样品的微生物特征,通过与当地高产田土壤微生物特征比较发现:我国冷浸田土壤的微生物量碳含量(70.98～356.61mg/kg)总体低于高产田,差异显著(P<0.05);冷浸田土壤中可培养的细菌、真菌、放线菌、氨化细菌、固氮菌、纤维素分解菌的平均值分别为高产田土壤的53.93%,43.33%,47.32%,51.98%,44.83%,47.80%。表明我国冷浸田土壤微生物总量偏低且活性弱。但是,可培养的硫化细菌数量(平均16.21×106个/g土)和铁还原菌数量(平均9.28×107个/g土)高于高产田土壤中可培养的硫化细菌数量(平均13×106个/g土)和铁还原菌的数量(平均7.32×107个/g土),说明我国冷浸田土壤中硫化氢和亚铁浓度较高。因此,只要有针对性的改良冷浸田土壤微生物群落结构和功能的多样性,冷浸田土壤肥力将大大提高。更多还原

【Abstract】 The present study has analyzed the microorganism characteristic in soil sample of seven provinces which is the main distribution region of waterlogged soil in China.Compared with high-yield fields soil in the same area,some results were found as below: The contents of microbial biomass carbon(70.98~356.61 mg/kg) in the waterlogged soil were lower than that in high-yield field soil,and a significant difference was found between them(P<0.05);the average value of cultivable bacteria,fungi,actinomycetes,nitrogen-fixing bacteria,ammonification bacteria,cellulose decomposer in the waterlogged soil were 53.93%,43.33%,47.32%,51.98%,44.83%,47.80% of those in high-yield field soil.The above microorganism characteristic indicated that the total quantity of microorganism and the microbial activity were all lower in waterlogged soil.But the quantity of sulfur-oxidizing bacteria(16.21×106 per gram of the sample) and iron-reducing bacteria(9.28×107 per gram of the sample) were higher than the quantity of sulfur-oxidizing bacteria(13×106 per gram of the sample)and iron-reducing bacteria(7.32×107 per gram of the sample) in high-yield field soil.The result indicated that the concentration of ferrous iron and hydrogen sulfide were higher in waterlogged soil.In conclusion,only after a series of improvement which focused on the diversity in soil microorganism community structure and function in the waterlogged soil,the fertility of waterlogged soil will be enormously improved.更多还原