氮素添加对黄土高原典型草原土壤氮矿化的影响

doi:10.11733/j.issn.1007-0435.2014.03.005

草地学报 ›› 2014, Vol. 22 ›› Issue (3): 461-468.DOI: 10.11733/j.issn.1007-0435.2014.03.005

氮素添加对黄土高原典型草原土壤氮矿化的影响

邹亚丽^1,2, 牛得草¹, 杨益¹, 文海燕¹, 傅华¹

1. 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;
2. 天水师范学院生化学院, 甘肃天水 74100

收稿日期:2013-11-25 修回日期:2014-03-05 出版日期:2014-06-15 发布日期:2014-06-04
通讯作者: 傅华
作者简介:邹亚丽（1971- ），女，四川自贡人，硕士，副教授，主要从事土壤生态学和环境污染方面的研究，E-mail：zoulzu@163.com
基金资助:
甘肃省科技重大专项（1203FKDA035）；中国科学院战略性先导科技专项（XDA05050403）；国家自然科学基金项目（31070412）（31201837）资助

The Effects of Nitrogen Addition on Soil Nitrogen Mineralization in the Semi-arid Typical Grassland of Loess Plateau

ZOU Ya-li^1,2, NIU De-cao¹, YANG Yi¹, WEN Hai-yan¹, FU Hua¹

1. Collage of Pastoral Agriculture Science and Technology, Lanzhou University, State Key Laboratory of Grassland Agro-ecosystems, Lanzhou, Gansu Province 730020, China;
2. Tianshui Normal University, College of Life Science and Chemistry, Tianshui, Gansu Province 741000, China

Received:2013-11-25 Revised:2014-03-05 Online:2014-06-15 Published:2014-06-04

摘要/Abstract

摘要：

为了解氮沉降对黄土高原典型草原土壤氮矿化的影响，通过人工氮肥添加模拟试验，采用埋置PVC 管的树脂芯方法原位测定了土壤氮素净氨化、净硝化和净矿化量的季节变化规律，探讨了氮素添加初期对氮矿化/固持贡献量和硝态氮淋溶损失量的影响。结果表明：黄土高原典型草原土壤氮矿化以硝化作用为主，夏季净硝化速率显著高于秋季。氮添加初期改变了半干旱草地氮矿化的季节模式，夏季表现为氮固持，秋季表现为氮矿化，并增加了氮矿化/固持的变异度，氮添加和季节因素对土壤氮矿化/固持有显著的交互作用。氮添加初期高氮添加未抑制氮的矿化过程。夏秋2季树脂硝态氮的含量随模拟氮沉降强度增加而显著增加，但硝态氮淋失量小，仅占施氮量的1.72%～4.74%。

关键词: 净氮矿化, 氮添加, 典型草原, 原位培养

Abstract:

To understand the effects of nitrogen deposition on the soil nitrogen mineralization of typical grassland in Loess plateau, the resin core method (buried PVC pipe) was employed to determine the seasonal pattern of in-situ net ammonification, nitrification and net mineralization, explore the effects of nitrogen addition on the contribution of net nitrogen mineralization/immobilization and the amount of nitrate nitrogen leaching at the beginning of nitrogen addition. The results showed that the nitrification was the main mineralization progress in the typical grassland of Loess plateau, and the net nitrification rate was significant higher in summer than that in autumn. The seasonal pattern of nitrogen mineralization was changed in semi-arid grassland at the beginning of nitrogen addition. Nitrogen transformation presented nitrogen immobilization in summer and nitrogen mineralization in autumn, the variation of nitrogen mineralization-immobilization was increased. There was significant interaction between seasonal factor and nitrogen addition on nitrogen mineralization-immobilization. Nitrogen mineralization wasn't inhibited under high N addition at the beginning of nitrogen addition. The content of nitrate nitrogen in resin significantly increased with the increase of nitrogen addition rate, but the values were small and only accounted for 1.72%～4.74% of nitrogen application rate.

Key words: Net nitrogen mineralization, Nitrogen addition, Typical grassland, In-situ incubation

中图分类号:

S812.4

邹亚丽, 牛得草, 杨益, 文海燕, 傅华. 氮素添加对黄土高原典型草原土壤氮矿化的影响[J]. 草地学报, 2014, 22(3): 461-468.

ZOU Ya-li, NIU De-cao, YANG Yi, WEN Hai-yan, FU Hua. The Effects of Nitrogen Addition on Soil Nitrogen Mineralization in the Semi-arid Typical Grassland of Loess Plateau[J]. Acta Agrestia Sinica, 2014, 22(3): 461-468.

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氮素添加对黄土高原典型草原土壤氮矿化的影响

The Effects of Nitrogen Addition on Soil Nitrogen Mineralization in the Semi-arid Typical Grassland of Loess Plateau

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