水蚀条件下硝酸铵施用对黄绵土氮素流失的影响  

Nitrogen Loss of Loess Soil as Affected by NH_4NO_3 Applying in Process of Water Erosion

作　　者：张兴昌[1] 

机构地区：[1]中国科学院,水利部水土保持研究所

出　　处：《农业工程学报》2000年第2期58-63,共6页Transactions of the Chinese Society of Agricultural Engineering

基　　金：国家自然科学基金!(498710 49);中国科学院"西部之光"人才培养项目;中国科学院重大科研项目!( KZ951-B1-211);特别支持项目!(

摘　　要：研究结果表明不同坡度谷子地 ,高 N处理小区径流中铵态氮、硝态氮和有效氮浓度平均为 1.0 6、0 .76和1.82 mg/kg,低 N分别为 0 .6 4、1.2 9和 1.93mg/kg;高氮处理土壤铵态氮、硝态氮和有效氮平均流失量分别达到17.90、12 .93和 30 .84kg/(km2 · a) ,低 N流失量为 11.90、2 3.86和 35 .77kg/(km2 · a)。高氮处理小区泥沙中有机质和全氮浓度平均为 5 .2 1和 0 .5 36 g/kg,而低氮处理分别为 4.94和 0 .481g/kg;高氮和低氮处理土壤有机质流失量分别为 5 70 2和 5 743kg/(km2 · a) ,土壤全氮流失量为 498和 5 5 9kg/(km2 · a)The millets fertilizing NH 4NO 3 with high N(NH 4NO 3 500 kg/hm 2) and low N(NH 4NO 3 250 kg/hm 2), are planted in the slope lands with 10°, 20°, 25°and 30° slope gradient. The research results were as follows: The mean concentrations of NH + 4 N, NO 3 N and NH + 4+NO 3 in runoff were 1 06, 0 76, and 1 82 mg/kg in high N treatment (HNT), and 0 64, 1 29, 1 93 mg/kg in low N treatment (LNT) respectively. The loss amounts of them in runoff were 17 90, 12 93, and 30 84 kg/(km 2·a) in HNT, and 11 90, 23 86, 35 77 kg/(km 2·a) in LNT seperately. The concentrations of organic matter and total N in sediment were 5 21 and 0 536 g/kg in HLT, 4 94 and 0 481 g/kg in LNT seperately. Accordingly, the loss amounts of them in sediment were 5 702, 5 743 kg/(km 2·a) in HLN, and 498,559 kg/(km 2·a) in LNT respectively.

关 键 词：土壤水蚀 硝酸铵氮肥 土壤氮素流失 黄绵土 

分 类 号：S153.61[农业科学—土壤学] S143.12[农业科学—农业基础科学]