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| 云南抚仙湖主要入湖河流有机碳来源辨识 |
| Investigation on Sources of Organic Carbon in Major Rivers in the Catchment of Fuxian Lake, Yunnan Province |
| 投稿时间：2015-11-25 修订日期：2016-03-20 |
| DOI：10.14050/j.cnki.1672-9250.2016.03.002 |
| 中文关键词: 抚仙湖;入湖河流;有机碳;碳同位素;分布特征 |
| 英文关键词: Fuxian Lake;inflowing river;organic carbon;carbon isotope;distribution characteristics |
| 基金项目:国家自然科学基金(U1302231);贵州省重大基础应用研究计划(黔科合J重大字[2015]2001) |
| 作者 | 单位 | E-mail | | 丁薇1,2, 陈敬安2, 杨海全2,3, 宋以龙2,3, 陶红波1,2, 罗婧4 | 1. 贵州大学 资源与环境工程学院, 贵阳 550025
2. 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 550081
3. 中国科学院大学, 北京 100049
4. 中国航天建设集团有限公司, 北京 100071 | chenjingan@vip.skleg.cn |
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| 中文摘要: |
| 通过对云南抚仙湖流域土壤、植被和主要入湖河流有机碳含量和碳同位素组成的对比研究,探讨了抚仙湖主要入湖河流有机碳来源、空间分布特征及其影响因素。结果表明,抚仙湖入湖河流溶解有机碳(DOC)含量较高,变化范围为2.79~38.02 mg/L,且呈西部(19.20 mg/L) > 北部(13.82 mg/L) > 东部(3.37 mg/L)的分布特征;河流颗粒有机碳(POC)含量较低,变化范围为0.22~2.68 mg/L,且北部(0.84 mg/L) > 西部(0.56 mg/L) > 东部(0.40 mg/L)。抚仙湖主要入湖河流水体δ13CDOC值变化范围为-12.6‰~-25.5‰,且随DOC含量增大而略呈偏负趋势,表明抚仙湖入湖河流DOC除来源于流域土壤侵蚀外,农业面源污染和生活污水排放也是重要的贡献源。抚仙湖入湖河流水体δ13CPOC值主要分布范围为-23.2‰~-27.0‰,与流域土壤及植物δ13C一致,远离内源POC的δ13C范围,指示河流POC主要来源于流域土壤侵蚀和植物碎屑输入。 |
| 英文摘要: |
| In this study, δ13C values and concentrations of dissolved organic carbon (DOC) and particle organic carbon (POC) of soils, plants, and inflow water were measured to investigate the spatial distribution, source and controlling factors of the organic carbon in Fuxian Lake, Yunnan Province. The results showed that the inflow waters had high DOC concentrations, ranging from 2.79 to 38.02 mg/L, while the concentration of DOC was evidently higher in the west (19.20 mg/L) and north(13.82 mg/L) than that in the east (3.37 mg/L). POC concentrations in the inflow waters were significantly low, ranging from 0.22~2.68 mg/L, while the POC concentration was higher in the north(0.84 mg/L) than that in the west (0.56 mg/L) and east (0.40 mg/L). The living sewage and widespread pollution from the overuse of fertilizers and pesticides in the drainage basin caused the high DOC concentrations in the rivers. The δ13CDOC value ranged from -12.6‰ to -25.5‰ and displayed slightly decreased trend with the increase of DOC contents, which indicated the DOC in the rivers was of a mixed origin of soils erosion, nonpoint source pollution and sewage discharge. The δ13CPOC of inflow waters varied mainly in the range of -23.23‰~-26.96‰, far from the range of endogenous particulate organic matters, while consistent with the soil and plant of the basin. This indicated the POC was mainly derived from soil erosion and plant fragments input. |
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