| 引用本文: | 张曾宇,李哲,方芳,郭劲松,高红涛,冯婧,刘静.三峡支流澎溪河消落带落干初期N2O释放与反硝化特征初探.湖泊科学,2014,26(6):923-930. DOI:10.18307/2014.0615 |
| ZHANG Zengyu,LI Zhe,FANG Fang,GUO Jinsong,GAO Hongtao,FENG Jing,LIU Jing.Preliminary study of N2O emission and denitrification at early exposure period in Pengxi River drawdown area, Three Gorges Reservoir. J. Lake Sci.2014,26(6):923-930. DOI:10.18307/2014.0615 |
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| 三峡支流澎溪河消落带落干初期N2O释放与反硝化特征初探 |
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张曾宇1, 李哲2, 方芳1, 郭劲松2, 高红涛1, 冯婧1, 刘静1
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1.重庆大学城市建设与环境工程学院, 重庆 400044;2.中国科学院重庆绿色智能技术研究院, 重庆 400030
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| 摘要: |
| 水库近岸湿地(消落带)土壤N2O释放和反硝化作用是消落带氮的生物地球化学过程的重要组成部分.以三峡水库支流澎溪河高阳平湖库湾消落带为研究对象,于2013年落干初期,采用C2H2抑制-原状土柱培养法研究该处自然植被恢复区、农耕区和对照组等不同土地类型土壤的N2O释放速率和反硝化速率,并测定了土壤pH值、氧化还原电位、温度、有机质、总氮、铵态氮、硝态氮和土壤孔隙含水量等环境指标.结果表明,自然植被恢复区土壤N2O释放速率为9.88±6.49g N/(hm2·d),反硝化速率为58.94±52.84g N/(hm2·d);农耕区土壤N2O释放速率和反硝化速率分别为7.71±4.44和30.70±25.68g N/(hm2·d).不同土地类型间N2O释放速率差异显著,落干初期土壤氧含量、含水量及氮含量对不同土地类型N2O释放和反硝化作用影响明显.土壤氧含量的升高促进了自然植被恢复区的N2O释放,并在一定程度上抑制了该区域反硝化作用.农耕区土壤含水量高于自然植被恢复区,可能致使N2O释放速率低于自然植被恢复区,而反硝化速率高于自然植被恢复区.消落带土壤氮含量降低同反硝化速率降低有一定联系. |
| 关键词: 三峡水库 澎溪河 消落带 N2O释放 反硝化作用 |
| DOI：10.18307/2014.0615 |
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| 基金项目:重庆市自然科学重点基金项目(CSTC2012JJB20004)、国家自然科学基金项目(51009155,51179215)和中国科学院西部行动计划项目(KZCX2-XB3-14)联合资助 |
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| Preliminary study of N2O emission and denitrification at early exposure period in Pengxi River drawdown area, Three Gorges Reservoir |
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ZHANG Zengyu1, LI Zhe2, FANG Fang1, GUO Jinsong2, GAO Hongtao1, FENG Jing1, LIU Jing1
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1.Faculty of Urban Construction and Environmental Engineering, Chongqing University, Chongqing 400044, P.R.China;2.Chongqing Institute of Green and Intelligent Technology, Chinese Academy of Sciences, Chongqing 400030, P.R.China
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| Abstract: |
| Soil N2O emission and denitrification in the wetland (water level drawdown) area of reservoirs are critical pathways in the N biogeochemistry cycles. The intact soil core-acetylene inhibition technique was applied to investigate the N2O emission and denitrification rates on grass land, cultivated area and background group in Lake Gaoyang drawdown area of Pengxi River, a tributary in the Three Gorges Reservoir, from March to April in 2013. Environmental impact factors, e.g. pH, oxidation-reduction potential, temperature, organic matter, total nitrogen, ammonium nitrogen, nitrate nitrogen and water-filled pore space, were measured simultaneously. The grass land had a mean N2O emission rate of 9.88±6.49 g N/(ha·d), and a mean denitrification rate of 58.94±52.84 g N/(ha·d). The mean N2O emission rate and denitrification rate of cultivated area were 7.71±4.44 g N/(ha·d) and 30.70±25.68 g N/(ha·d), respectively. The difference of N2O emission rate in different land use types was significant. The N2O emission and denitrification processes were greatly affected by the soil oxygen content, water content and nitrogen content of soils. An increase in soil oxygen content stimulated the N2O emission in grass area and inhibited the denitrification process in a certain extent. Larger water content in the cultivated area, comparing with that in the grass area, probably lead to a smaller N2O emission rate. Soil nitrogen content had a positive relationship with the decline of denitrification rate in the drawdown area. |
| Key words: Three Gorges Reservoir Pengxi River drawdown area N2O emission denitrification |
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