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研究长期施用两种不同量有机肥 (M2 、M4)和化肥 (NPK)的黑土微生物量N在作物生长季的变化特征 .结果表明 ,施用有机肥黑土微生物量N显著高于施用化肥 (NPK)和不施肥 (CK) ,微生物量N季节波动小 .微生物量N为M42 5 5 2～ 2 39 12mg·kg-1,M2 10 4 0～ 94 31mg·kg-1,NPK 6 2 7～ 87 0 4mg·kg-1,CK 9 15～ 6 9 81mg·kg-1,同一处理最大值与最小值相差 7～ 14倍 .M2 、NPK处理微生物量N最大值出现在抽雄吐丝期 ,M4处理最大值出现在拔节期 ,CK处理最大值出现在播种期 ;不同处理微生物量N的差异并未因季节变化及玉米生育时期影响而明显改变 .微生物量N的动态变化与极少数黑土生物、理化特性指标动态变化显著相关 ;微生物量N与黑土生物、理化特性 ,植物氮、磷、钾有极显著的正相关关系 ,与土壤含水量、籽粒粗蛋白含量呈显著正相关关系 .
The results showed that the microbial biomass N of black soil was significantly higher than that of NPK application, and the change of soil microbial biomass N And no fertilization (CK). The microbial biomass N fluctuated less in the seasons, and the microbial biomass N was M42 5 52-2 39 12 mg · kg -1, M2 10 4 0-94 31 mg · kg -1, NPK 6 27-70 8 4 mg · kg-1, CK 9 15-6 9 81 mg · kg-1, the maximum and minimum value of the same treatment were 7 to 14 times lower than the maximum value The value of CK appeared at the sowing time at the jointing stage and the difference of N in the different treatments did not change obviously due to the seasonal change and the influence of the maize growth stage.The dynamic change of microbial biomass N was related to the few biological and physicochemical properties of black soil There was a significant positive correlation between the microbial biomass N and the biological, physicochemical properties, nitrogen, phosphorus and potassium in the black soil, and had a significant positive correlation with the soil moisture content and the crude protein content in the grain.