不同施肥条件对玉米生长季耕层土壤微生物量碳的影响

Effect of Different Fertilization Treatment on the Soil Microbial Biomass Carbon of Maize

为了研究不同施肥条件下棕壤长期定位试验玉米整个生长季微生物量碳含量的动态变化,试验采用氯仿熏蒸、灭菌、提取,TOC测定的方法研究了15个不同施肥处理对耕层土壤微生物量碳含量的影响。结果表明,施用有机肥料可以显著提高土壤微生物量碳含量,随着有机肥用量的增加土壤微生物量碳提高,在玉米的生殖生长阶段其含量达到最大。单施化肥区土壤微生物量碳含量在玉米整个生长季节都处于一种波动变化,在玉米前期,其含量受温度、水分、作物吸收等影响较大;而到了生殖生长阶段,微生物量碳含量有逐渐升高趋势,但上升幅度不大;成熟期微生物量碳含量迅速下降,都低于播种前。

The effect different fertilization on soil microbial biomass carbon in whole maize growth stage by chloroform suffocating was studied. The results indicate that the content of SMBC was increased with organic fertilizer input and reach the peak in reproductive development stage. In inorganic fertilizer input plot, the content of SMBC was dynamic changing in all maize stage. In preventing growth stage of maize,the content of SMBC was affected by temperature, moisture and absorption by maize mainly. In reproductire development stage, the amount of SMBC was increased with time slightly. In maturation stage, it was decreased rapidly and lower than seedling.