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三峡库区消落带土壤氮素吸附释放规律
引用本文:詹艳慧,王里奥,焦艳静.三峡库区消落带土壤氮素吸附释放规律[J].重庆大学学报(自然科学版),2006,29(8):10-13.
作者姓名:詹艳慧  王里奥  焦艳静
作者单位:重庆大学资源及环境科学学院,重庆400030
基金项目:重庆市科委、计委资助项目(03-26)
摘    要:通过实验研究了淹水-落干对三峡水库消落带土壤氨氮等温吸附特性的影响,以及土壤吸附一定的氨氮后再淹水条件下向上覆水体释放氮素的规律,并分析了土壤氮素的吸附释放对三峡库区水环境的影响.结果表明:1)三峡水库消落带土壤对氨氮具有一定的吸附能力,吸附等温曲线满足Langmuir方程,且经淹水-落千后氨氮吸附能力增强,由淹水-落千前的666mg/kg增加到淹水-落千后的833mg/kg;2)模拟淹水条件下,吸附了一定氨氮的三峡水库消落带土壤向上覆水中释放氮素,土壤吸附的氨氮越多,释放的总氮通量亦越多,且好氧条件下总氮释放通量是厌氧总氮释放通量的1.2—1.4倍;3)三峡水库消落带土壤落干期吸纳大量来自农田地表径流的氮素,再淹水向水体中释放大量的氮素,增加了三峡水库发生富营养化的风险.

关 键 词:三峡水库  消落带  吸附与释放  氮素  富营养化
文章编号:1000-582X(2006)08-0010-04
收稿时间:2006-03-22
修稿时间:2006-03-22

Adsorption & Release of Nitrogen of Soils in Three Gorges Reservoir
ZHAN Yan-ui,WANG.Adsorption & Release of Nitrogen of Soils in Three Gorges Reservoir[J].Journal of Chongqing University(Natural Science Edition),2006,29(8):10-13.
Authors:ZHAN Yan-ui  WANG
Institution:College of Resources and Environmental Science In Li-ao, JIAO Yan-jing Chongqing University, Chongqing 400030, China
Abstract:The effects of flooding and subsequent air-drying on NH_4~+ adsorption and the release of nitrogen of typical soils adsorbed ammonia in Three Gorges reservoir were studied in the laboratory.The influence of adsorption and release of soils in Three Gorges Reservoir on Aquatic Environment Quality was also studied.The results show that: 1) The adsorption ability is enhanced by flooding and subsequent air-drying.The capacity of the ammonia adsorption capacity was increased from 666 mg/kg to 833 mg/kg.2) Nitrogen,which has been adsorbed by sample soils in drawdrown area of Three Gorge area,is released under simulating flooding condition.The more the soil adsorbed,the more the nitrogen released.The ratio between aerobic condition and anaerobic condition is 1.2~1.4.3) The soils in drawdrown area of Three Gorge Reservoir can adsorb nitrogen from surface runoff,and during submersion periods the nitrogen is released.The risk of Eutrophication is increased in Three Gorges Reservoir.
Keywords:Three Gorge reservoir  drawdrown area  adsorption - desorption  release  nitrogen
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