大气氮沉降对黄土高原土壤氮特征的影响
Influence of nitrogen deposition on soil nitrogen characteristics in the typical steppe on Loess Plateau

文海燕傅华牛得草张永超

文摘	为了解氮沉降对土壤氮特征的影响,通过人工氮肥添加模拟试验,分析在不同氮添加梯度下黄土高原典型草原土壤全氮(TN)和轻组有机氮(LFON)含量的变化特征。结果显示,氮添加对黄土高原典型草原土壤0~40cm土层TN含量没有显著影响(P>0.05);但是显著增加了土壤表层(0~10cm)的LFON含量和LFON/TN(P<0.05)。氮添加对10~20和20~40cm的LFON含量和LFON/TN没有显著影响(P>0.05)。本研究表明,在黄土高原典型草原实施氮添加的初期,LFON含量和LFON/TN比TN含量能更早地显示出土壤氮特征的变化。
其他语种文摘	To study the influence of nitrogen addition on soil nitrogen characteristics in the steppe on Loess Plateau, six levels of nitrogen (N) treatments, 0,1. 15,2. 3,4. 6, 9. 2 and 13. 8 g ? m~(-2) were conducted in the experiment. Based on the field sampling and laboratory analysis,the responses of soil total nitrogen (TN) and light fraction organic nitrogen (LFON) contents to the N addition were examined. The results showed that the early N addition had no significant effect on the TN content in the 0 - 40 cm soil layer. However, the early N addition significantly increased LFON content and LFON/TN in the 0 - 10 cm soil layer. There were no obvious changes of LFON and LFON/TN in the 10 - 20 cm and 20 - 40 cm layer among treatments. LFON and LFON/TN were more influenced by the early N addition than TN. Therefore, LFON and LFON/TN were sensitive indictors of soil N dynamics to the early N addition in the steppe on the Loess Plateau.
来源	草业科学 ,2013,30(5):694-698 【扩展库】
关键词	氮沉降 ; 典型草原 ; 全氮 ; 轻组有机氮
地址	兰州大学草地农业科技学院, 草地农业生态系统国家重点实验室, 甘肃, 兰州, 730020
语种	中文
文献类型	研究性论文
ISSN	1001-0629
学科	农业基础科学
基金	甘肃省科技重大专项 ; 国家自然科学基金 ; 国家教育部高等学校博士学科点专项科研基金
文献收藏号	CSCD:4855181