【摘要】 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 .更多还原

【Abstract】 This paper studied the dynamics of microbial biomass N in a black soil long-term fertilized with farmyard manure(M 2 and M 4)and chemical fertilizer(NPK)during crop growth season.The results showed that the soil microbial biomass N was 25.52～239.12 mg·kg -1 in M 4,10.40～94.31 mg·kg -1 in M 2,6.27～87.04 mg·kg -1 in NPK,and 9.15～69.81 mg·kg -1 in CK.In same treatment,the highest value was 7～14 times higher than the lowest value.Treatments NPK and M 2 had the highest value of microbial biomass N at reproductive growth stage,while M 4 and CK had it at vegetative growth stage.The significant difference of soil microbial biomass N caused by different treatments was not changed with plant growth stages.The dynamics of soil microbial biomass N had a significant correlation some soil biological,physical and chemical properties.A significant positive correlation was found between soil microbial biomass N and soil biological,physical and chemical properties,plant N,P and K contents,soil moisture,and grain crude protein.更多还原