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以黑龙江省桦川县黑土为研究对象,通过对比分析不同旱田改水田年限土壤中硝化细菌、亚硝化细菌、好氧自生固氮菌、氨化细菌、反硝化细菌的数量来探讨旱田改水田对土壤氮素转化微生物的影响。结果表明:旱田改水田有利于硝化细菌、亚硝化细菌、好氧自生固氮菌、氨化细菌的积累,不利于反硝化细菌的积累。随着旱田改水田年限的增加,硝化细菌与亚硝化细菌先增加后减少,好氧自生固氮菌先减少后增加,反硝化细菌数量逐渐降低;其中,旱田改水田年限为10年时硝化细菌、亚硝化细菌最多,好氧自生固氮菌最少。
Taking the black soil of Huachuan County of Heilongjiang Province as the research object, this paper studied the effects of dry-farming on paddy field by comparing the quantity of nitrifying bacteria, nitrosing bacteria, aerobic nitrogen-fixing bacteria, ammonifying bacteria and denitrifying bacteria in soils with different dry- Effects of Nitrogen Transformation on Microbes. The results showed that the improvement of paddy fields to paddy fields was favorable to the accumulation of nitrifying bacteria, nitrosated bacteria, aerobic autotrophic bacteria and ammonifying bacteria, which was not conducive to the accumulation of denitrifying bacteria. The number of nitrobacteria and nitrosated bacteria firstly increased and then decreased, while that of aerobic autotrophic azotobacter first decreased and then increased, and the number of denitrifying bacteria decreased gradually with the increase of the dry-field conversion to paddy field. Among them, Nitrosobacteria most, aerobic autotrophic bacteria at least.