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引用本文:周起超,张运林,周永强,陈毅良,秦江,聂菊芬.抚仙湖秋、冬季光衰减特征及其与有色可溶性有机物的关系.湖泊科学,2016,28(6):1316-1327. DOI:10.18307/2016.0617
ZHOU Qichao,ZHANG Yunlin,ZHOU Yongqiang,CHEN Yiliang,QIN Jiang,NIE Jufen.Spectral attenuation of ultraviolet and visible radiation and its relationship with chromophoric dissolved organic matter in autumn/winter in Lake Fuxian, China. J. Lake Sci.2016,28(6):1316-1327. DOI:10.18307/2016.0617
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抚仙湖秋、冬季光衰减特征及其与有色可溶性有机物的关系
周起超1,2, 张运林2, 周永强2,3, 陈毅良1, 秦江1, 聂菊芬1
1.云南省环境科学研究院(中国昆明高原湖泊国际研究中心)高原湖泊流域污染过程与管理云南省重点实验室, 昆明 650034;2.中国科学院南京地理与湖泊研究所湖泊与环境国家重点实验室, 南京 210008;3.中国科学院大学, 北京 100049
摘要:
为了研究抚仙湖紫外辐射(UVR)和光合有效辐射(PAR)衰减的时空特征及其与有色可溶性有机物(CDOM)、悬浮物(SS)、浮游植物(叶绿素a表征)等因子的关系,于2014年10月(秋季)、2015年1月(冬季)开展现场调查,结果显示:秋季不同波长(段)的漫射衰减系数Kd(305)、Kd(340)和Kd(PAR)分别为1.27±0.12、0.68±0.11和0.32±0.13 m-1,冬季分别为1.13±0.10、0.63±0.07和0.36±0.07 m-1;秋季CDOM的不同波长吸收系数ag(254)、ag(305)和ag(340)分别为4.09±0.26、1.18±0.09和0.57±0.05 m-1,冬季分别为2.95±0.24、0.61±0.11和0.11±0.07 m-1,秋季ag(254)、ag(305)和ag(340)显著高于冬季;秋季Kd(305)显著大于冬季,这与秋季(雨季)较高的CDOM丰度、浮游植物生物量(及SS浓度)有关.秋季ag(305)/Kd(305)、ag(340)/Kd(340)均显著高于冬季;秋季及秋冬季整体而言,ag(254)与Kd(305)、Kd(340)呈显著正相关,各多元逐步回归方程中均包含ag(254),说明CDOM吸收对UVR的衰减有重要贡献.空间差异方面,秋季北部的ag(254)、Kd(305)和Kd(340)显著高于南部,冬季南北部无明显差异,或与雨旱季北岸河流输入的CDOM和SS的情况有关.此外,浮游植物对UV-B衰减的影响和SS(与CDOM的交互作用)对UV-A衰减的影响更在于季节变化方面,而影响UVR、PAR衰减的各因子的相对贡献有待进一步量化.
关键词:  漫射衰减系数  紫外辐射  真光层  有色可溶性有机物  时空分布  抚仙湖
DOI:10.18307/2016.0617
分类号:
基金项目:国家自然科学基金项目(41601208,41325001)、湖泊与环境国家重点实验室开放基金项目(2016SKL007)、云南省科技计划项目(2016RA081)和云南省应用基础研究计划项目联合资助.
Spectral attenuation of ultraviolet and visible radiation and its relationship with chromophoric dissolved organic matter in autumn/winter in Lake Fuxian, China
ZHOU Qichao1,2, ZHANG Yunlin2, ZHOU Yongqiang2,3, CHEN Yiliang1, QIN Jiang1, NIE Jufen1
1.Yunnan Key Laboratory of Pollution Process and Management of Plateau Lake-Watershed, Yunnan Institute of Environmental Science(Kunming China International Research Center for Plateau Lake), Kunming 650034, P. R. China;2.State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, P. R. China;3.University of Chinese Academy of Sciences, Beijing 100049, P. R. China
Abstract:
To understand the temporal-spatial characteristics of the diffuse attenuation of ultraviolet radiation (UVR) and photosynthetically active radiation (PAR) and its relationship with chromophoric dissolved organic matter(CDOM), suspended solids (SS), chlorophyll-a (Chl.a) and other factors in Lake Fuxian, an oligotrophic deep lake in Yunnan Plateau, we carried out an investigation based on field work in October 2014 (autumn) and January 2015 (winter). The results showed that the values of diffuse attenuation coefficient that Kd(305),Kd(340) and Kd(PAR) were 1.27±0.12 m-1, 0.68±0.11 m-1 and 0.32±0.13 m-1, respectively in autumn, which were 1.13±0.10 m-1, 0.63±0.07 m-1 and 0.36±0.07 m-1, respectively in winter. Meanwhile, the values of absorption coefficient of CDOM that ag(254),ag(305) and ag(340) were 4.09±0.26 m-1, 1.18±0.09 m-1, 0.57±0.05 m-1, respectively in autumn, which were 2.95±0.24 m-1, 0.61±0.11 m-1, 0.11±0.07 m-1, respectively in winter. The values of of ag(254),ag(305) and ag(340)in autumn were significantly higher than in winter. The values of of Kd(305) in autumn were significantly higher than in winter, which was related with higher CDOM abundance, phytoplankton biomass (and SS concentration) in autumn (rainy season).Furthermore, the values of ag(305)/Kd(305) and ag(340)/Kd(340)in autumn were significantly higher than which in winter;there were significant positive correlations between ag(254) and Kd(305),Kd(340),and the ag(254) included in all stepwise regression equations both in autumn and autumn-winter, indicated that the absorption of CDOM was an important factor affecting on the diffuse attenuation of UVR. Moreover, there were obvious differences depend on spatial distribution of ag(254), Kd(305) and Kd(340) in autumn, the values of ag(254), Kd(305) and Kd(340) in the north region of the lake was significantly higher than in the south region, whereas there were no significant differences between the north and south regions of ag(254), Kd(305) and Kd(340) in winter, which might be related with the different river input scenarios of CDOM and SS from the northern shore between autumn (rainy season) and winter (dry season). In addition, the influences of phytoplankton on UV-B attenuation, the interaction between SS and CDOM on UV-A attenuation were reflected in seasonal changes. However, the relative contribution of pure water, CDOM, phytoplankton and tripton to spectral attenuation (including UVR and PAR) should be quantized in future.
Key words:  Diffuse attenuation coefficient  ultraviolet radiation  euphotic  chromophoric dissolved organic matter  temporal-spatial distribution  Lake Fuxian
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