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引用本文:李思佳,宋开山,陈智文,赵莹,邵田田,穆光熠,关莹.兴凯湖春季水体悬浮颗粒物和CDOM吸收特性.湖泊科学,2015,27(5):941-952. DOI:10.18307/2015.0522
LI Sijia,SONG Kaishan,CHEN Zhiwen,ZHAO Ying,SHAO Tiantian,MU Guangyi,GUAN Ying.Absorption characteristics of particulates and CDOM in spring in the Lake Xingkai. J. Lake Sci.2015,27(5):941-952. DOI:10.18307/2015.0522
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兴凯湖春季水体悬浮颗粒物和CDOM吸收特性
李思佳1,2, 宋开山2, 陈智文1, 赵莹2, 邵田田2, 穆光熠2,3, 关莹2
1.吉林师范大学生态环境研究所, 四平 136000;2.中国科学院东北地理与农业生态研究所, 长春 130102;3.东北师范大学生命科学学院, 长春 130000
摘要:
为了分析兴凯湖水体光学活性物质的吸收特性、来源和空间分布以及对400~700 nm范围内总吸收的贡献,于2013年5月对该水体进行野外实验,对水体中浮游藻类、非藻类颗粒物和有色可溶性有机物的吸收特性和水质参数进行测定. 结果表明:总悬浮颗粒物的吸收光谱与非藻类颗粒物相似,色素颗粒物含量较少且单一,非藻类颗粒物在总悬浮颗粒物吸收中占主导地位,其贡献率始终在50%以上.CDOM吸收曲线的拟合函数斜率值Sg均高于其它水体.440 nm处总悬浮颗粒物和非藻类颗粒物的吸收系数ap(440)、ad(440)与总悬浮颗粒物、无机悬浮颗粒物和有机悬浮颗粒物浓度相关性均较好,与叶绿素a(Chl.a)浓度的相关性较差.兴凯湖与其它Ⅱ类水体的差异性表现在440nm处CDOM吸收系数ag(440)与Chl.a浓度、溶解性有机碳(DOC)浓度均无显著相关性,说明DOC以无色部分为主.总体上,大兴凯湖各吸收系数和水质参数均值均低于小兴凯湖,后者水质受农耕区退水及周围渔业、旅游业的影响较大.
关键词:  兴凯湖  吸收光谱  有色可溶性有机物  非藻类颗粒物  浮游植物
DOI:10.18307/2015.0522
分类号:
基金项目:国家自然科学基金项目(44171293)和兴凯湖生态环境保护基线调查项目(JXZFCG2013-XXK21-03)联合资助.
Absorption characteristics of particulates and CDOM in spring in the Lake Xingkai
LI Sijia1,2, SONG Kaishan2, CHEN Zhiwen1, ZHAO Ying2, SHAO Tiantian2, MU Guangyi2,3, GUAN Ying2
1.Institute of Ecological Environment, Jilin Normal University, Siping 136000, P. R. China;2.Northeast Institute of Geography and Agricultural Ecology, Chinese Academy of Sciences, Changchun 130102, P. R. China;3.Life Science College, Northeast Normal University, Changchun 130000, P. R. China
Abstract:
Field surveys were carried out in the Lake Xingkai(including both the Great Lake Xingkai and the Small Lake Xingkai) in May 2013, and water samples were collected for examination of the absorption features. In the laboratory, tripton and chromophoric dissolved organic matter(CDOM) absorption of 20 water samples were measured through quantitative filter technique. Absorption coefficients were used to analyse the absorption characteristics, source, spatial distribution and relative contribution of optical active constituents over the range of PAR(400-700 nm). The results showed that the absorption spectra of tripton are similar to nonalgal particles, indicating less phytoplankton presence in the water column. The total particulate absorption is dominated by the nonalgal particles, of which the contribution rate is up to 50% of the total absorption, and Sg is higher than that in water bodies being investigated elsewhere. Positive correlation of the particles was observed within ap(440), ad(440) and total suspended matter, inorganic suspended matter and organic suspended matter, respectively, while weak correlation was recorded in terms of chlorophyll-a(Chl.a) compared with results reported in literatures. In the current study, low correlations of the particles were observed within ag(440), Chl.a and dissolve dissolved organic carbon(DOC). This is probably due to the fact that more colorless DOCs are present in the Lake Xingkai. Absorption coefficient and water quality parameters showed insignificant difference between the Great Lake Xingkai and the Small Lake Xingkai, though the latter is greatly impacted by farmland irrigation discharge, fisheries and tourism sewage.
Key words:  Lake Xingkai  absorption spectra  CDOM  nonalgal particles  phytoplankton
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