矿质氮在土壤剖面中的分布  

Distributions of Mineral N in Soil Profile Li Shengxiu;Zhang Zhihua;Gao Yajun

作　　者：李生秀[1] 张志华[1] 高亚军[1] 李世清[1] 王喜庆[1] 

机构地区：[1]西北农业大学,陕西杨陵712100

出　　处：《干旱地区农业研究》1993年第S1期141-145,共5页Agricultural Research in the Arid Areas

摘　　要：选择澄城县离村较远,多年很少施用化肥的旱地,多点采取了0～300cm的深层土样,分层分析其NO^-_3—N,NH^+_4—N含量,研究接近自然土壤条件下NO^-_3—N,NH^+_4—N在土壤剖面中的分布。结果表明,土壤中NO^-_3—N含量以耕层最大,80～300cm内基本稳定;NH^+_4—N含量以耕层最高,在30～300cm内相当稳定,无层次变化。在0～60cm的土层中,NH^+_4—N,NO^-_3—N均服从对数正态分布;60～200cm的土层中,NH^+_4—N,NO^-_3—N或服从对数正态,或服从正态分布,或服从其他类型的分布,不定;200～300cm的土层中,NH^+_4—N,NO^-_3—N基本都服从对数正态和正态分布。Soil samples of 6 layers from 0 to 300 cm were taken in Chengcheng County in a field a litt-le far from village and with little application of chemical fertilizers in the past years, and NO_3^-—N and NH_4^+—N were determined in order to investigate the distribution of mineral N in soil pro-file under natural condition. The results show tbat NO_3^- —N contents were higher at agric hori-zon, and stable at the depths from 80 cm to 300 cm. The NH_4^+ —N contents were also higher atagric horizon, but stable from 30 to 300 cm without obvious changes among layers. From 0 cmto 60 cm, both NH_4^+ —N and NO_3^- —N distributed in log-normal form, and from 60 cm to 200cm, their distribution types were unstable, in normal, log-normal or other forms; from 200 cmto 300cm, they distributed in either normal or log-normal shape.

关 键 词：NO₃^--N NH₄⁺-N 垂直分布 对数正态分布 正态分布 

分 类 号：S423[农业科学—植物保护]