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本试验从微生物生态研究入手,采用常规法分析测定了土壤微生物的区系和农化性状。试验表明,武威县灌区土壤每克含微生物达数亿个,这表明该区土壤较肥沃。在轮作过程中,套种草木樨后的玉米地土壤微生物数量最大。种草能促进土壤微生物的活动。但是对固氮菌和纤维素分解菌有不利的影响。试验还比较了小麦单作和套作草木樨的土壤微生物区系,结果表明了固氮菌和纤维素分解菌在这两种种植方式的土壤中的发育状况,并指出这两类微生物在土壤中均具有交替性消长的趋势。土壤有机质的消长和纤维素分解菌的活动强度密切相关。
This study started from the microbial ecology research and determined the flora and agrochemical characters of soil microorganisms by routine method. Experiments show that the soil in Wuwei irrigation area contains hundreds of millions of microorganisms per gram, indicating that the area is fertile soil. During rotation, the amount of soil microbes in the maize field after intercropping was the largest. Grass can promote soil microbial activities. But has a detrimental effect on nitrogen-fixing bacteria and cellulolytic bacteria. The experiment also compared the soil microbial flora of wheat single and intercropped grass clogs, and the results showed the development status of nitrogen-fixing bacteria and cellulose-decomposing bacteria in the soils of the two planting methods. It was also pointed out that the two kinds of microorganisms in the soil All have the tendency of alternating growth and decline. The growth and decline of soil organic matter is closely related to the activity of cellulolytic bacteria.