桂林五里峡水库丰水期溶解有机碳特征  

Water Chemistry and Characteristics of Dissolved Organic Carbon During the Wet Season in Wulixia Reservoir,SW China

作　　者：卢晓漩 李强[1,3] 靳振江[4] 彭文杰[1,4] 房君佳[1,2] 黄炳惠 宋昂 LU Xiao-xuan1,2, LI Qiang1,3, JIN Zhen-jiang4, PENG Wen-jie1,4, FANG Jun-jia1,2, HUANG Bing-hui1,4, SONG Ang1(1. Key Laboratory of Karst Dynamics, Ministry of Land and Resources ＆ Guangxi, Institute of Karst Geology, Chinese Academy of Geological Sciences, Guilin 541004, China; 2. Chongqing Key Laboratory of Karst Environment, School of Geographical Sciences, Southwest University, Chongqing 400715, China; 3. International Research Center on Karst under the Auspices of UNESCO, Guilin 541004, China; 4. College of Environmental Science and Engineering, Guilin University of Technology, Guilin 541006, Chin)

机构地区：[1]中国地质科学院岩溶地质研究所,国土资源部、广西岩溶动力学重点实验室,桂林541004 [2]西南大学地理科学学院,岩溶环境重庆市重点实验室,重庆400715 [3]联合国教科文组织国际岩溶研究中心,桂林541004 [4]桂林理工大学环境科学与工程学院,桂林541006

出　　处：《环境科学》2018年第5期2075-2085,共11页Environmental Science

基　　金：广西自然科学基金项目(2015GXNSFGA139010,2014GXNSFCA118012); 中国地质科学院项目(YYWF201505); 中国地质调查局项目(DD20160305-05)

摘　　要：为更全面、准确把握岩溶碳循环特征,本文在获取桂林五里峡水库丰水期水化学及溶解有机碳(DOC)分布特征的基础上,还借助紫外吸收光谱技术对水体有机质分子量大小等进行分析.结果表明,五里峡水库丰水期水化学类型仍为HCO_3-Ca·Mg型,水体营养状态为中等营养型,未达到富营养状态;五里峡水库丰水期DOC质量浓度比枯水期低,DOC为TOC的主要组成部分,DOC质量浓度在垂直方向上呈表层至底层降低的趋势,这是Chl-a、DIC等水环境因子综合影响的结果;S_(275~295)、M、SUVA_(254)、E_(253)/E_(203)吸收光谱特征参数表征下的库区水体有机质以小分子量物质为主,富里酸所占比例高,腐殖酸所占比例低,芳香性较弱,苯环上脂肪族等非极性官能团含量较多,表明库区水体DOC内源特征较强,有机质生物活性较好,在水库碳循环中发挥了积极作用.In recent years,scientists have focused on the karst carbon cycle. To better understand the hydrochemical characteristics and the physical-chemical properties of DOC in the wet season in karst areas,the water chemistry and DOC distribution characteristics in Wulixia reservoir were analyzed. The molecular weight of the water organic matter was analyzed based on the UV absorption spectrum. The results showed that the water chemistry of Wulixia reservoir was HCO3-Ca·Mg,the nutrient status of the water body was of the medium nutrient type,and the water maintained a good quality. The DOC mass concentration was lower in the wet season than in the dry season,and DOC was the main component of TOC. The DOC mass concentration tended to decrease from the surface to the bottom in a vertical direction. Chl-a and DIC were the main factors affecting the DOC vertical distribution. The organic matter in the reservoir area related to the absorption spectrum parameters of S（275 ~ 295）,M,SUVA（254）,and E（253）/E（203） showed that the water was dominated by constituents with small molecular weight,a high proportion of fulvic acid,low proportion of humic acid,and weak aroma.The results showed that the organic matter in the reservoir area was readily consumed by microbial bioactivity and that it played an active role in the carbon cycle of the reservoir. It also showed that the DOC endogenous characteristics of the reservoir were strong and provided a sufficient carbon source for heterotrophic microbes.

关 键 词：岩溶区 岩溶水化学 溶解有机碳 DOM吸收光谱 五里峡水库 

分 类 号：X524[环境科学与工程—环境工程]