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
查看参考文献24篇
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文摘
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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。 |
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其他语种文摘
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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. |
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来源
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草业科学
,2013,30(5):694-698 【扩展库】
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关键词
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氮沉降
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典型草原
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全氮
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轻组有机氮
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地址
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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
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1001-0629 |
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学科
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农业基础科学 |
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基金
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甘肃省科技重大专项
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国家自然科学基金
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国家教育部高等学校博士学科点专项科研基金
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文献收藏号
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CSCD:4855181
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