摘要
对陕西渭北8县87个苹果园不同土壤剖面中的硝态氮和铵态氮含量进行了分析测定结果表明，不同产区果园0～120cm剖面土壤中，铵态氮含量为4．67±1．37mg·kg^-1．且变化幅度较小；硝态氮舍量为22．86±24．98mg·kg^-1，各果园土壤变化幅度较大，含量在0．33～119．8mg·kg^-1之间，且随着土层的加深，硝态氮含量呈逐渐增大的趋势，大部分在40～60cm土层出现累积高峰，之后随土层加深累积量大部分逐渐下降。由于过量施肥，测试苹果园土壤0～120cm累积了大量的硝态氮。
The NH4^＋-N and NO3^- -N contents were determined in different soil depth profiles from 87 apple orchards in 8 counties in Weibei area of Shaanxi Province. The results showed that the content of ammonium nitrogen were 4.67 ±1.37mg·kg^-1 and didn＇ t change much in 0 - 120 cm soil depth profiles of orchards in different apple pro- ducing regions, the content of nitrate nitrogen were 22.86 ±24.98mg·kg^-1 and changed largely from 0.33 to 119.8 mg · kg^-1, the amount of NO3^- -N had the tendency of becoming large with the depth of the soil layer, accumulating peak was mostly on 40 -60 cm soil layer, then the accumulating amount was decreasing gradually. Orchard soils tested accumulated a large amount of nitrate nitrogen in 0 - 120 cm due to over-fertilization.
出处
《西北林学院学报》
CSCD
北大核心
2006年第4期50-53,共4页
Journal of Northwest Forestry University
基金
农业部948项目(2003-Q07)
杨陵示范区农业科技推广基金
关键词
苹果园
矿质氮累积
土壤剖面
apple orchard
N-min accumulation
soil depth profiles
