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确定了土娄土各自然层的固定态铵容量 ,覆盖层、粘化层和黄土母质层分别为( 4 82 .2± 1 0 .4) mg N/kg、( 1 1 34.9± 4.0 ) mg N/kg和 ( 553.0± 1 1 .3) mg N/kg土。估算了土娄土覆盖层和粘化层的最大蓄氮量 ,分别为 5692 .5kg N/hm2 和 8475.0 kg N/hm2 ;并估算出土娄土覆盖层和粘化层在耕作及栽培条件下的最大蓄氮量 ,它们分别为 32 70 .0 kg N/hm2 和6975.0 kg N/hm2 。15N标记试验结果表明 :土娄土“新”固定态铵中有 62 .1 %～ 78.9%的 NH+ 4来自肥料 NH+ 4 。盆栽试验结果表明 :土娄土覆盖层和黄土母质层中“新”固定态铵的释放率分别为 98.32 %和 95.0 9%
The fixed ammonium capacity of each natural layer of soil was determined. The overburden, adhesive layer and loess parent layer were (4 82.2 ± 1.04) mg N / kg and (1 1 34.9 ± 4.0) mg N / kg and (553.0 ± 1 1 .3) mg N / kg soil. The maximum nitrogen storage capacity of soil cover and clay layer was estimated at 5692.5 kg N / hm2 and 8475.0 kg N / hm2, respectively. The soil cover and adhesive layer of soil were evaluated under tillage and cultivation conditions The maximum nitrogen storage capacity was 32 70.0 kg N / hm2 and 6975.0 kg N / hm2, respectively. The results of 15N mark test showed that 62.1% -78.9% NH + 4 from the “new” fixed ammonium in the soil from the soil was from the fertilizer NH + 4. The results of pot experiment showed that the release rates of “new” fixed ammonium in soil cover and loess parent layer were 98.32% and 95.0 9%