西藏纳木错及其入湖河流溶解有机碳和总氮浓度的季节变化  

Seasonal variations of dissolved organic carbon and total nitrogen concentrations in Nam Co and inflowing rivers,Tibet Plateau

作　　者：开金磊 王君波[1,2] 黄磊[1,3] 汪勇 鞠建廷[1] 朱立平 KAI Jinlei;WANG Junbo;HUANG Lei;WANG Yong;JU Jianting;ZHU Liping(Institute of Tibetan Plateau Research,Chinese Academy of Sciences,Beijing 100101,P.R.China;Center for Excellence in Tibetan Pleteau Earth Sciences,Chinese Academy of Sciences,Beijing 100101,P.R.China;Universtiy of Chinese Academy of Sciences,Beijing 100049,P.R.China;School of Geography and Tourism,Anhui Normal University,Wuhu 241002,P.R.China)

机构地区：[1]中国科学院青藏高原研究所,青藏高原环境变化与地表过程重点实验室,北京100101 [2]中国科学院青藏高原地球科学卓越创新中心,北京100101 [3]中国科学院大学,北京100049 [4]安徽师范大学地理与旅游学院,芜湖241002

出　　处：《湖泊科学》2019年第4期1099-1108,共10页Journal of Lake Sciences

基　　金：国家自然科学基金项目(41571189,41877168);科技部基础性工作专项(2012FY111400);国家重点基础研究发展计划“973”项目(2012CB956100)联合资助

摘　　要：为深入理解纳木错湖水及入湖河流中溶解有机碳(DOC)和总氮(TN)浓度的季节变化特征及其影响因素,于2012—2013年不同季节对纳木错2个站点及流域内21条主要入湖河流进行采样及分析,采用统计学方法初步探讨纳木错水体和21条河流DOC和TN浓度季节变化特征.结果表明,河流DOC平均浓度范围为0.763~1.537 mg/L,TN平均浓度范围为0.179~0.387 mg/L. 21条入湖河流DOC浓度在春末夏初和夏季达到高值,冬季为低值,TN浓度季节变化趋势大体上与DOC浓度相反.湖泊水体DOC和TN浓度范围分别为2.42~8.08和0.237~0.517 mg/L,明显分别高于河水中的浓度.湖泊DOC浓度季节变化趋势与河流一致,而TN浓度无明显的季节性变化.河水DOC浓度的季节变化和空间差异受控于河流的补给方式,湖水DOC浓度受湖泊内部藻类等水生植物活动和河流外源输入的影响. DOC等有机质的分解是影响纳木错流域湖水和河水TN浓度的重要原因.Water samples were seasonally collected from two sites in Nam Co and twenty-one inflowing rivers around the lake in 2012 and 2013.Seasonal variations of dissolved organic carbon (DOC) and total nitrogen (TN) concentrations were investigated.Results indicated that DOC concentrations of the twenty-one inflowing rivers ranged from 0.763 to 1.537 mg/L,and TN concentrations ranged from 0.179 to 0.387 mg/L.Average DOC concentrations reached higher values in the late spring and summer,but lower values in winter.TN concentrations showed a contrasting seasonal variation with DOC concentrations.DOC and TN concentrations in Nam Co were 2.42-8.08 mg/L and 0.237-0.517 mg/L,respectively,and seasonal variability of DOC concentrations in lake had same trend as those in inflowing rivers,while TN concentrations showed slight seasonal changes.The seasonal and spatial variations pattern of river DOC concentrations were controlled by recharge modes,while these DOC concentration patterns in the lake are influenced by hydrophyte,algae and exogenous inputs.Meanwhile,the decomposition of DOC and other organic matter significantly influenced the TN concentrations of rivers and lake water column in Nam Co catchment.

关 键 词：溶解有机碳 总氮 季节变化 纳木错 入湖河流 青藏高原 

分 类 号：P343.3[天文地球—水文科学] X143[天文地球—地球物理学]