贵州百花湖分层晚期有机质降解过程与溶解N2O循环
DECOMPOSITION OF ORGANIC MATTER AND N2O CYCLING IN LAKE BAIHUA, GUIZHOU DURING THE LATE STRATIFICATION
查看参考文献27篇
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文摘
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百花湖是一个具有季节性分层的富营养小型湖泊,在秋季湖水倒转期经常发生水质恶化事件,碳氮循环出现异常.文章研究特选择在秋初,湖泊分层开始消失时,测定了湖水中不同深度的N2O,CH4,CO2,有机和无机碳同位素以及其他化学参数变化.结果发现:采样时百花湖在约6m和16m深度附近出现了两个温度不连续层(SDL和PDL),并影响到有机颗粒的沉降和分解.相对而言,有较多的有机质在这两个层内发生降解,但降解的途径有所不同,上部主要是有氧降解,下部则主要是无氧降解过程.N2O的产生和消耗与有机质的降解过程完全对应:PDL层以上,ΔN2O与AOU的线性关系反映了N2O主要形成于硝化作用;PDL层以下反硝化作用导致N2O严重不饱和;PDL内位于硝化作用和反硝化作用过渡带的N2O峰,显然是硝化与反硝化联合作用的结果.PDL层内较大的CH4浓度变化梯度,说明嗜甲烷细菌可能通过氧化NH+4贡献了部分N2O.百花湖秋、冬季表层湖水N2O都是过饱和的,都是大气N2O的源,依据分子扩散模型计算湖泊N2O的释放通量在12～14μmol/m·day之间,秋、冬季没有明显的差别.秋季底层湖水的反硝化作用是湖泊N2O的汇,其消耗通量与表层的释放通量基本相当. |
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其他语种文摘
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Lake Baihua is a small euthophic lake with a seasonally anoxic hypolimnia, where seasonal deterioration of water quality very often happens during the fall turn over. In this paper N2O, CO2, CrL, carbon isotope and some physical and chemical pa-rameters are determined in fall when the stratification begin to disappear. The results show that two discontinuity layers, SDL and PDL, occur at the depth of about 6 and 16 meters, respectively. Relatively, more organic matter is decomposed in these two dis-continuous layers. However, the mechanisms are different. It is aerobic decomposition in SDL and anaerobic in and below PDL. The production and consumption of nitrous oxide perfectly accord with the processes of decomposition of organic matter: Above the PDL, a good positive correlation betweenΔN2O and AOU suggests that nitrous oxide is produced by nitrification. Below the PDL, the undersaturation of N2O is ascribed to denitrification to N2, and the peak of N2O in PDL evidently results from the cou-pling of nitrification and denitrifieation .It is also likely that N2O is partially produced through the oxidation of NH4+ by the methanotrophic bacteria. Surface water N2O is super saturated with atmospheric N2O in both fall and winter. The flux of N2O emission is estimated to be about 12 ~ 14fimol/m2* day in fall and winter without distinct seasonal difference. The denitrification of N2O to N2 in hypolimnia result in a depletion of approximatey 6 ~ 13/imol/m2·day. |
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来源
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第四纪研究
,2004,24(5):569-577 【核心库】
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关键词
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分层湖泊
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有机质降解
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碳同位素
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硝化与反硝化作用
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溶解N2O
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源汇效应
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地址
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中国科学院地球化学研究所, 环境地球化学国家重点实验室, 贵阳, 550002
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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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1001-7410 |
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学科
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化学;地球物理学 |
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基金
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国家自然科学基金项目
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中国科学院知识创新工程项目
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文献收藏号
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CSCD:1689839
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