【摘要】 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%更多还原

【Abstract】 The fixed NH + 4 capacity of all natural layers in lou soil was determined in this thesis,they were 482.2±10.4,1134.9±4.0 and 553.0±11.3 mg N/kg soil in overburden layer,claying horizen and loess parent material horizen respectively.The maximum accumulating N amount of overburden layer and claying horizen both in no cultivation and in cultivation conditions in Lou soil was estimated,they were 5 692.5 and 8 475.0 kg N/hm 2 in no cultivation condition and 327.00 and 6 975.0 kg N/hm 2 in cultivation cendition. Experiment result of N 15 labelling showed that there was 62.1%～ 78.9% of the new fixed NH + 4 in Lou soil coming from fertilizers.The result of pot experiment displayed that the releasing ratio of the new fixed NH + 4 of overburden layer and loess parent material horizon in Lou soil was 98.32% and 95.09% respectively.更多还原