湖泊科学Issue(6)：1316-1327,12.DOI:10.18307/2016.0617
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∗
Spectral attenuation of ultraviolet and visible radiation and its relationship with chromo-phoric dissolved organic matter in autumn/winter in Lake Fuxian, China
摘要
Abstract
To understand the temporal⁃spatial characteristics of the diffuse attenuation of ultraviolet radiation ( UVR) and photosyn⁃thetically 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 in⁃vestigation 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 ab⁃sorption 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, re⁃ spectively 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 signifi⁃cantly 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) in⁃cluded in all stepwise regression equations both in autumn and autumn⁃winter, indicated that the absorption of CDOM was an im⁃portant 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 at⁃tenuation, 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 quan⁃tized in future.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Key words
Diffuse attenuation coefficient/ultraviolet radiation/euphotic/chromophoric dissolved organic matter/temporal-spatial distribution/Lake Fuxian引用本文复制引用
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∗[J].湖泊科学,2016,(6):1316-1327,12.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． （）
