干旱区生态环境知识资源中心(Arid): 寒旱区湖泊冰封期有机碳氮同位素研究

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	寒旱区湖泊冰封期有机碳氮同位素研究
其他题名	Organic carbon and nitrogen isotopes of lakes in cold and arid region during the frozen period
	杨文焕; 周明利; 申涵; 王志超; 李卫平
来源期刊	中国环境科学
ISSN	1000-6923
出版年	2020
卷号	40 期号:2
中文摘要	为了探究寒旱区湖泊悬浮物和沉积物中颗粒有机碳氮稳定同位素来源与环境相关性,于2019年1月对南海湖冰封期悬浮物和表层沉积物有机 delta~(13)C、delta~(15)N及C/N值进行了测定.结果表明:南海湖冰封期悬浮有机质delta~(13)C的变化范围为-31.9 4~-27.87,delta~(15)N变化范围为15.16~18.66,C/N变化范围为3.90~5.13.沉积物delta~(13)C值变化范围为-25.39~-18.83,delta~(15)N值变化范围为7.04~13.66,C/N值变化范围为7.66~12.23.悬浮有机质de lta~(13)C和 delta~(15)N最高值分别出现在进水口区和湖心岛区,沉积物则都为湖心岛区表层沉积物.端元混合模型分析表明,冰封期悬浮有机质主要由内源水生藻类主导,水质保护区藻类贡献率达到82.33%,与该区域浮游植物丰度最高相符.表层沉积物有机质的主要来源为内源水生植物,在水质保护区贡献率高达89 .7%.相关性分析表明,在冰封期内悬浮有机质与表层沉积物delta~(13)C、delta~(15)N并没有明显的相关性,在低温情况下悬浮物de lta~(15)N与温度(P<0.025)、硝态氮(P<0.019)呈显著负相关,与亚硝态氮呈显著正相关(P<0.034).原因主要与外源贡献率和生物作用的同位素效应有关.悬浮物delta~(13)C和COD呈极显著正相关(P<0.008),与盐度呈显著正相关(P<0.046),COD和悬浮物delta~(13)C很可能具有同源性,在湖泊冰封期具有一定的环境指示意义.
英文摘要	In order to explore the environmental significance of the particulate organic as the source of stable isotopic carbon and nitrogen in suspended solids and sediments of the Lake in cold and arid regions,the contents of delta~(13)C,delta~(15)N and C/N ratio of suspended solids and surface sediments in Nanhai Lake during the ice-sealing period were determined in January 2019.The results showed that,delta~(13)C,delta~(15)N,C/N in the suspended organic matters varied in the range of-31.94~-27.87,15.16~18.66,and 3.90~5.13,respectively,while in the sediments varied in the range of-25.39~-18.83,7.04~13.66,and 7.66~12.23,respectively.The peak values of the delta~(13)C and delta~(15)N contents in the suspended organic substances appeared in the water entering area and the islands in the center of the lake,respectively,while in sediments,both the peak values appeard in the latter.The end-member mixing model showed,the suspended organic matter in the frozen period was mainly originated from the endogenous aquatic algae,which contributed 82.33% of the total suspended organic matters in the water conservation area,being consistent with the highest abundance of phytoplankton in the area.The main source of organic matters in the surface sediments was endogenous aquatic plants,which contributed 89.7% of the total organic matters in the water conservation area.Analyses showed that there was no significant correlation between suspended organic matter and delta~(13)C,delta~(15)N in the surface sediments during the freezing period.At low temperature,there exist significant negative correlation between the suspended delta~(15)N and temperature(P<0.025)as well as nitrate nitrogen(P<0.019),positive correlation between the suspended delta~(15)N and the nitrite nitrogen(P<0.034).These maybe due to the exogenous contribution rate and the isotopic effect of biological action.There was an extremely significant positive correlation between delta~(13)C and COD in suspended matter(P<0.008),and a significant positive correlation between delta~(13)C and salinity(P<0.046).The COD and suspended ~(13)C are likely to have homology and have a certain environmental indication in the lake ice-sealing period.
中文关键词	寒旱区湖泊 ; 冰封期 ; 有机质 ; 稳定同位素
英文关键词	lake in cold and arid regions ice-sealing period organic matter stable isotop
类型	Article
语种	中文
收录类别	CSCD
WOS类目	Environmental Sciences & Ecology
CSCD记录号	CSCD:6829868
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/354035
作者单位	杨文焕, 内蒙古科技大学能源与环境学院, 包头, 内蒙古 014010, 中国. 周明利, 内蒙古科技大学能源与环境学院, 包头, 内蒙古 014010, 中国. 申涵, 内蒙古科技大学能源与环境学院, 包头, 内蒙古 014010, 中国. 王志超, 内蒙古科技大学能源与环境学院, 包头, 内蒙古 014010, 中国. 李卫平, 内蒙古科技大学能源与环境学院, 包头, 内蒙古 014010, 中国.
推荐引用方式 GB/T 7714	杨文焕,周明利,申涵,等. 寒旱区湖泊冰封期有机碳氮同位素研究[J],2020,40(2).
APA	杨文焕,周明利,申涵,王志超,&李卫平.(2020).寒旱区湖泊冰封期有机碳氮同位素研究.中国环境科学,40(2).
MLA	杨文焕,et al."寒旱区湖泊冰封期有机碳氮同位素研究".中国环境科学 40.2(2020).