硝态氮在羊草—土壤中的分配及其季节动态  

Seasonal Changes and Distributions of NO_3^- N in Leymus Chinese Soil System

作　　者：李雪梅[1] 张利红[1] 

机构地区：[1]辽宁大学环境与生命科学学院,沈阳110036

出　　处：《辽宁大学学报（自然科学版）》1999年第4期388-392,共5页Journal of Liaoning University：Natural Sciences Edition

摘　　要：同一时期羊草地上部各器官硝态氮含量是：叶大于茎大于穗，前两者硝态氮含量随季节逐渐增加，到８ 月达最大值，随后下降．穗中硝态氮含量则是随季节逐渐下降．地下部不同层次根系中硝态含量表层的最高，随深度增加逐渐降低，在整个生长季节内，７ 、８ 月份含量最高．土壤中硝态氮含量深度变化不明显，同一层硝态氮含量７ 、８ 月份最高．In the same stage, NO - 3 N content of different aboveground organs of Leymus Chinese was leaf>stem>ear, NO - 3 N content of ear decreased gradually with season. The maximum NO - 3 N content of roots was in surface layers, and the content decreased gradually with soil depth. The NO - 3 N content in July and August was maximum. The change of NO - 3 N content in the soil was not obvious with depth. In the same layer, the content of NO - 3 N reached maximum in July and August.

关 键 词：羊草 硝态氮 土壤 草地 生态 氮素循环 

分 类 号：S812[农业科学—草业科学]