摘要
采用好气恒温培养法,通过一次和分次供氮的方式,研究不同尿素施用量对黑土土壤无机态氮浓度的短期效应。结果表明:CK处理(不供氮方式)在培养期间,NH4+-N的浓度始终保持较低水平,而NO3--N浓度则呈稳步上涨的变化态势;pH值稳定在6.0～6.3之间;硝化率则稳定在90%左右。一次供氮方式各处理NH4+-N的浓度,在施氮后第3d时达到最大,第20d后趋于稳定;NO3--N的浓度则呈稳步增长的态势;土壤的pH值与NH4+-N的浓度的变化规律相似,在培养后的第3d达到峰值,而后开始下降,在培养第10d时,各处理的pH值趋于稳定,且明显低于CK;而硝化率则随着培养时间的延长,呈逐渐增加的变化趋势,在第20d时已与CK无显著差异,趋于平缓。分次供氮各处理在第1次施氮1d后,NH4+-N浓度达到峰值,之后开始呈下降的变化趋势,另外3次施氮后NH4+-N浓度变化与此类似,且每次施肥后第3d和第10d土壤NH4+-N浓度之间差异不显著;NO3--N浓度在第1次施氮1d后,各处理差异不明显,第3d达到最大,但整体上是呈稳步增长的变化趋势;各处理的pH值的变化情况与一次供氮的情况相似;土壤硝化率硝化率呈先下降后上升的趋势,整体呈逐步上升的变化趋势。
The concentration of inorganic nitrogen with single and multiple N application styles were studied in black soil by using aerobic incubation.The results revealed that the NH＋4-N on the average concentration was relatively low with CK treatment,however,the NO-3-N concentration was increased with time;The pH maintained at about 6.0~6.3,and nitrification rate maintained at 90%.The peak of NH＋4-N concentration of single N application style appeared on the 3rd day after the urea was applied respectively,and the NH＋4-N concentration became flat on the 10th day and lower than that of CK treatment;In general,the nitrification rate increased with time,however,the nitrification rate became flat on the 20th day and had no significant difference with the other treatments.After the first N application,the concentration of NH＋4-N at 1st had reached peak and later decreased for the multiple N application style,which was similar to the other N application treatments.There are no difference between the concentration of NH＋4-N at the 3rd and that of the 10th days;After the first N application,the concentration of NO-3-N at 1st had no difference in all treatments and at 3rd had reached peak,however,the NO-3-N concentration was increased with time;The dynamic of pH of the treatments with multiple N application style were similar with the treatments for single N application style;The nitrification rate first increased and then decreased,but the trend showed increased with time.
出处
《水土保持学报》
CSCD
北大核心
2011年第1期53-57,63,共6页
Journal of Soil and Water Conservation
基金
黑龙江省自然科学基金(ZD200904)
国家重点基础研究发展计划(973计划)(2010CB134509,2011CB100506)
国家自然科学基金(40971152)
