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引用本文:王静,吴丰昌,黎文,王立英,郭建阳,傅平青,张润宇.云贵高原湖泊颗粒有机物稳定氮同位素的季节和剖面变化特征.湖泊科学,2008,20(5):571-578. DOI:10.18307/2008.0504
WANG Jing,WU Feng-chang,LI Wen,WANG Li-ying,GUO Jian-yang,FU Ping-qing,ZHANG Run-yu.Seasonal variation and vertical characteristics of the δ15N of particulate organic matter in Lake Hongfeng and Lake Baihua, Guizhou Province. J. Lake Sci.2008,20(5):571-578. DOI:10.18307/2008.0504
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云贵高原湖泊颗粒有机物稳定氮同位素的季节和剖面变化特征
王静1,2, 吴丰昌1,2, 黎文1, 王立英1, 郭建阳1, 傅平青1, 张润宇1
1.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;2.中国环境科学研究院, 北京 100012
摘要:
以贵州省两个高原湖泊(红枫湖和百花湖)为例,利用颗粒态有机物稳定氮同位素比值(δ15 NPOM)的季节及水体剖面变化反映揭示了湖泊氮源变换以及内部生物地球化学作用,为研究湖泊系统氮的循环转化提供有用信息.结果发现:红枫湖表层颗粒态有机物的δ15N变化范围是3.7‰-14.9‰;百花湖表层颗粒态有机物的δ15 N变化范围为1.3‰-8.7‰.红枫湖在冬季(2月)和夏末秋初(9月)出现高值;百花湖则在冬季(2月)出现最低值,夏末秋初(9月)出现高值.红枫湖δ15NPOM值的季节性变化规律恰好与无机氮源的δ15 N值的变化规律一致,冬季高δ15 NPOM值的原因是其枯水期受工业废水中富含15N的无机氮源的影响,而春季低δ15 NPOM值的原因则是受内源硝化作用产生的富含14N的无机氮源的影响.百花湖冬季δ15 NPOM值低的原因是受生活污水中具有较低δ15N值的有机颗粒的影响.同时,湖泊水体剖面δ15NPOM和C/N比值相结合可以示踪湖泊系统内部特殊的生物地球化学过程.
关键词:  颗粒态有机物  稳定氮同位素  C/N  百花湖  红枫湖
DOI:10.18307/2008.0504
分类号:
基金项目:中国科学院知识创新工程重要方向项目(KZCX2-YW-102);中国环境科学研究院专项“地表环境中有机氮的循环过程与环境质量”(2007KYYW01);国家自然科学基金项目(4052511,40632011,40703022)联合资助
Seasonal variation and vertical characteristics of the δ15N of particulate organic matter in Lake Hongfeng and Lake Baihua, Guizhou Province
WANG Jing1,2, WU Feng-chang1,2, LI Wen1, WANG Li-ying1, GUO Jian-yang1, FU Ping-qing1, ZHANG Run-yu1
1.Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, P.R.China;2.Chinese Research Academy of Environmental Sciences, Beijing 100012, P.R.China
Abstract:
The stable nitrogen isotopic ratios of particulate organic matter (δ15NPOM) was used to elucidate the seasonal variation and vertical characteristics of the different dissolved inorganic nitrogen sources and autochthonous biogeochemistry processes in two lakes (Hongfeng and Baihua) in Guizhou Province, China. The δ15N values of surface POM seasonally varied from 3.7‰ to 14.9‰ in Lake Hongfeng and from 1.3‰ to 8.7‰ in Lake Baihua. It indicated that source of POM was greatly varied in these two lakes during study period. In Lake Hongfeng, the higher δ15N POM values appeared in winter (February, 2004) and summer (September, 2003). The highest δ15N POM values in winter were attributted to the input of high contents and 15N-enriched inorganic nitrogen from industry wastes. During spring, the δ15N POM values decreased when phytoplankton uptake 14 -enriched inorganic nitrate generated by nitrification in the interior Lake Hongfeng. The variation of δ15N values in surface POM coincided well with the variation of δ15N values of inorganic nitrogen sources. It suggestted that the variation of δ15NPOM mainly influenced by inorganic nitrogen sources, which might resulted from the impact of allochthonous human activities. In Lake Baihua, the higher values of δ15NPOM appeared in summer (September, 2003) while the values were low during winter season. These high and low values were possibly aroused by the growth of primary production and large 15N-depleted organic particles input from sewage respectively. In addition, the combination of δ15NPOM and C/N values in the vertical profile can be used to trace some special biogeochemistry processes in lacustrine ecosystem.
Key words:  Particulate organic matter  δ15NPOM  C/N  Lake Baihua  Lake Hongfeng
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