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| 长江干流颗粒有机碳及其同位素组成的季节性输送特征 | |
| 引用本文： | 茅昌平,季峻峰,罗郧,袁旭音,杨忠芳,宋垠先,陈骏.长江干流颗粒有机碳及其同位素组成的季节性输送特征[J].地学前缘,2011,18(6):161-168. |
| 作者姓名： | 茅昌平 季峻峰 罗郧 袁旭音 杨忠芳 宋垠先 陈骏 |
| 作者单位： | 1. 南京大学地球科学与工程学院,南京大学表生地球化学研究所,江苏南京210093／污染控制与资源化国家重点实验室,南京大学环境学院,江苏南京210093 2. 南京大学地球科学与工程学院,南京大学表生地球化学研究所,江苏南京210093 3. 中国地质环境监测院,北京,100081 4. 河海大学环境科学与工程学院,江苏南京,210098 5. 中国地质大学北京地球科学与资源学院,北京,100083 |
| 基金项目： | 国家自然科学基金项目(41021002,41103051);中国地质调查局项目“中国矿物碳汇潜力研究”(水[2011]01-15-18) |
| 摘 要： | 2007年夏季和冬季对长江干流悬浮物进行了季节性采样，系统分析了悬浮物颗粒有机碳含量及稳定碳同位素的组成，研究了其空间分布以及季节变化特征。结果显示，长江干流夏季颗粒有机碳含量在0．4％～1．3％，冬季含量在0．7%-2．2％。冬季和夏季颗粒有机碳平均δ^13C值分别为-24．74‰和～24．83‰，季节性差异不大，在... |
| 关 键 词： | 长江 有机碳同位素 季节变化 三峡工程 |
Seasonal variation in the flux and isotopic composition of particulate organic carbon along the mainstream of the Changjiang River |
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| Mao Changping,Ji Junfeng,Luo Yun,Yuan Xuyin,Yang Zhongfang,Song Yinxian,Chen Jun.Seasonal variation in the flux and isotopic composition of particulate organic carbon along the mainstream of the Changjiang River[J].Earth Science Frontiers,2011,18(6):161-168. | |
| Authors: | Mao Changping Ji Junfeng Luo Yun Yuan Xuyin Yang Zhongfang Song Yinxian Chen Jun |
| Institution: | 1.Institute of Surficial Geochemistry,Department of Earth Sciences,Nanjing University,Nanjing 210093,China 2.State Key Laboratory of Pollution Control and Resource Reuse,School of Environment,Nanjing University,Nanjing 210093,China 3.China Institute for Geo-Environmental Monitoring,Beijing 100081,China 4.College of Environmental Science and Engineering,Hohai University,Nanjing 210098,China 5.School of Earth Sciences and Resources,China University of Geosciences(Beijing),Beijing 100083,China |
| Abstract: | Suspended particulate matter(SPM) samples were collected along the Changjiang mainstream in summer and winter 2007 to investigate the distribution of organic particulate organic carbon(POC) concentrations and the stable isotopic composition of POC(δ13C) within the river system.The results indicate that the POC% has a range from 0.4% to 1.3% in summer and 0.7% to 2.2% in winter.The mean δ13C values of the POC in winter and summer are-24.74‰,-24.83‰,respectively.The C/N ratio has no significant seasonal variability.The δ13C values of upper reaches are higher than the values of the middle and lower reaches in winter(low flow season).The relative decrease in δ13C values during the low flow season from the upper to lower reaches could be interpreted as the result of an increase in the soil erosion rate and channel erosion in the middle and lower reaches after dam construction,except for flood events during which rivers are also strongly influenced by relative more contribution of phytoplankton from the middle and lower reaches.We got a total organic carbon flux of 1.46 Mt/a after impoundment of the Three Gorges Dam which could have caused a sharp reduction in sediment load of the Changjiang River. |
| Keywords: | Changjiang River organic carbon isotope seasonal variations Three Gorges Dam |
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