中文关键词伊洛河浑太河光学吸收特性颗粒物有色溶解性有机质(CDOM)空间差异性 英文关键词Yiluo RiverHuntai Riveroptical absorption characteristicsparticulate matterCDOMspatial difference

作者	单位	E-mail
李柳阳	河南大学黄河文明与可持续发展研究中心暨黄河文明传承与现代文明建设河南省协同创新中心, 开封 475001 河南大学环境与规划学院, 开封 475001	18317857228@163.com
邵田田	河南大学黄河文明与可持续发展研究中心暨黄河文明传承与现代文明建设河南省协同创新中心, 开封 475001	shaotiantian@vip.henu.edu.cn
张鑫	中国矿业大学(北京)地球科学与测绘学院, 北京 100086
宋炎炎	河南大学黄河文明与可持续发展研究中心暨黄河文明传承与现代文明建设河南省协同创新中心, 开封 475001 河南大学环境与规划学院, 开封 475001
苏东辉	河南大学黄河文明与可持续发展研究中心暨黄河文明传承与现代文明建设河南省协同创新中心, 开封 475001 河南大学环境与规划学院, 开封 475001
王涛	河南大学黄河文明与可持续发展研究中心暨黄河文明传承与现代文明建设河南省协同创新中心, 开封 475001 河南大学环境与规划学院, 开封 475001

中文摘要 为分析伊洛河和浑太河两流域水体光学活性物质的来源、吸收特征、空间差异以及在光合有效辐射（PAR）范围内对总吸收的贡献，于2017年和2013年5月分别在两流域进行河流样品采集，对两流域水体中悬浮颗粒物和有色溶解性有机质（CDOM）的吸收特性和水质参数进行测定.结果表明，两流域总悬浮颗粒物的吸收光谱[a_p（λ）]与非藻类颗粒物的吸收光谱[a_d（λ）]相似，与a_d（λ）和浮游植物的吸收[a_ph（λ）]均显著相关.两流域a_d（λ）均是总吸收的主要成分，伊洛河流域a_ph（λ）的贡献率大于CDOM，而浑太河则相反.通过对比蓝红比[a_ph（440）/a_ph（675）]发现，伊洛河流域样品蓝红比的变化幅度高于浑太河流域，说明同一季节浮游植物中辅助色素与叶绿素a浓度[Chla]的组成存在显著的空间差异.通过对比CDOM的吸收斜率（S_CDOM），发现伊洛河CDOM的组成物质分子量较浑太河大，主要为外源性物质.另外，通过CDOM的相对分子质量M_r[a_CDOM（250）/a_CDOM（365）]的对比，发现伊洛河水体的变化幅度高于浑太河，而均值小于浑太河，表明伊洛河水体的颗粒物大小不一，浑太河水体更趋近于小分子颗粒物，与基于S_CDOM得到的结果一致. 英文摘要 The absorption characteristics, composition, spatial variability, and relative contribution of optically active constituents over the range of photosynthetically active radiation (PAR, 400-700 nm) were analyzed from samples collected in the Yiluo and Huntai Rivers in May 2017 and 2013, respectively. Results demonstrated that the absorption curves of total suspended particulates[a_p(λ)] were similar to those of non-algae particles[a_d(λ)]. Significant correlations between a_p(λ) and a_d(λ) were obtained, especially at 440 nm, with r=0.968 in the Yiluo River and r=0.899 in the Huntai River. Meanwhile, positive correlations between a_p(λ) and the absorption of phytoplankton[a_ph(λ)] were observed at 675 nm. a_p(λ) in the two basins was dominated by a_d(λ). Moreover, the composition of auxiliary pigments and chloropyhll a concentration[Chla] showed more significant spatial variations based on a_ph(440)/a_ph(675) in the Yiluo River than in the Huntai River. In addition, CDOM absorption slopes (S_CDOM) indicated that CDOM composition in the Yiluo River was dominated by exogenous substances; in comparison, the Huntai River had more endogenous substances. S_CDOM in the Yiluo River was lower than in the Huntai River, indicating that the CDOM composition of the Yiluo River was inclined towards high molecular weights. Furthermore, M_r[a_CDOM(250)/a_CDOM(365)] showed greater ranges and lower mean values in the Yiluo River than in the Huntai River, confirming that CDOM molecular weight varied greatly in the former. CDOM molecular weight in the Huntai River was also lower than in the Yiluo River, in accordance with S_CDOM results.

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