大气氮沉降对三峡库区消落带土壤呼吸的影响

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摘要以三峡库区消落带落干期土壤为研究对象，采用室内模拟培养的方法，探讨了大气氮沉降通量及其组成对土壤呼吸的影响.结果表明，土壤呼吸速率对氮添加的响应为短期效应.1倍当前大气氮沉降添加下，无机氮和有机氮对土壤累积CO₂释放分别表现为无影响和抑制作用.除NH₄⁺-N在2倍氮沉降添加下表现为抑制作用外，2、3倍氮沉降添加均促进了土壤累积CO₂释放.与硝态氮相比，2、3倍氮沉降添加的铵态氮对土壤累积CO₂释放具有抑制作用.

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	何立平
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关键词 ：大气氮沉降, 三峡库区, 消落带, 土壤呼吸

Abstract：An indoor incubation experiment was conducted to reveal the effect of atmospheric nitrogen deposition on soil respiration of water level fluctuating zone in the Three Gorges Reservoir area. The results showed that the response of soil respiration rate to nitrogen addition was a short term effect. Under the present atmospheric nitrogen deposition flux, soil cumulative CO₂ release was not changed by inorganic nitrogen addition, while, it was inhibited by organic nitrogen addition. Except soil cumulative CO₂ release was depressed by ammonium addition of double present atmospheric nitrogen deposition flux, it was promoted by all the simulated atmospheric nitrogen deposition composition under both double and triple present atmospheric nitrogen deposition flux. Compared with ammonium, nitrate was more conducive for promoting cumulative CO₂ release under double and triple present atmospheric nitrogen deposition flux.

Key words： atmospheric nitrogen deposition Three Gorges Reservoir area water level fluctuating zone soil respiration

收稿日期: 2018-08-15

PACS:

X142

基金资助:国家自然科学基金资助项目（31770529）；重庆市教委科学技术研究项目（KJ1710260）；三峡库区水环境演变与污染防治重庆高校市级重点实验室开放基金（WEPKL2016LL-03，WEPKL2016ZD-01，WEPKL2016ZZ-01）；教育部春晖计划项目（Z2015133）；万州科技人才专项（2016-1）

通讯作者: 何立平,讲师,hlp_weird@163.com E-mail: hlp_weird@163.com

作者简介: 何立平(1982-),男,四川南充人,讲师,博士,主要从事环境土壤学研究.发表论文10余篇.

引用本文:

何立平, 田茂平, 吴红, 林俊杰, 兰波. 大气氮沉降对三峡库区消落带土壤呼吸的影响[J]. 中国环境科学, 2019, 39(3): 1132-1138. HE Li-ping, TIAN Mao-ping, WU Hong, LIN Jun-jie, LAN Bo. Effects of atmospheric nitrogen deposition on soil respiration in the water level fluctuating zone of the Three Gorges Reservoir area. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(3): 1132-1138.

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http://www.zghjkx.com.cn/CN/ 或 http://www.zghjkx.com.cn/CN/Y2019/V39/I3/1132

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