Zhang Wen-Hao, Zhao Duo-Lin, Wang Xiao-Yu, Hao Qiang-Zhou, Li Xi-Mei, Gao Peng-Cheng
College of Natural Resources and Environment, Northwest A&F University, Yangling 712100, China.
Taibaishan Nature Reservation Administrative Bureau, Yangling 712100, China.
Huan Jing Ke Xue. 2020 Nov 8;41(11):4958-4969. doi: 10.13227/j.hjkx.202004165.
It is very important to understand water ecology and the carbon cycle process by studying the composition, source, spectral characteristics, and influence factors of chromophoric dissolved organic matter (CDOM). The optical characteristics, composition, and source of CDOM in 71 water samples were collected from the lakes and four rivers of the Taibaishan Nature Reserve in the summer of 2019. The rivers included the Bawang, Heihe, Shitou, and Xushui Rivers. They were analyzed by UV-Vis spectral and three-dimensional fluorescence spectroscopy, combined with a parallel factor analysis model and redundant analysis. The results showed that CDOM in the water of the Taibaishan Nature Reserve contained two types of four fluorescent components, in which the humus-like components C1 and C2 were the main components of CDOM. The relative contribution of C1 and C2 to the rivers was 82%-96%, which was significantly larger than the lakes. All fluorescence indexes (FI) were larger than 1.8, the index of recent autochthonous contribution (BIX), and the index of freshness (:) were all approximately 0.6. The humification indexes (HIX) of the rivers were significantly larger than those of the lakes (<0.01). The DOM in the rivers was mainly from the forest soil of the Nature Reserve, and the water quality of the lakes was affected by tourists to some extent. The results of the redundant analysis show that the CDOM spectral characteristic parameters were significantly influenced by EC for the lakes (<0.05) and by EC, DTN, and DOC for the rivers (<0.01).
通过研究发色溶解有机物（CDOM）的组成、来源、光谱特征和影响因素来了解水生态和碳循环过程非常重要。2019年夏季，从太白山自然保护区的湖泊和四条河流采集了71个水样，分析了其中CDOM的光学特征、组成和来源。这四条河流分别是霸王河、黑河、石头河和湑水河。采用紫外-可见光谱和三维荧光光谱分析，并结合平行因子分析模型和冗余分析。结果表明，太白山自然保护区水体中的CDOM包含两种类型的四种荧光组分，其中类腐殖质组分C1和C2是CDOM的主要成分。C1和C2对河流的相对贡献为82%-96%，显著大于湖泊。所有荧光指数（FI）均大于1.8，近期自生源贡献指数（BIX）和新鲜度指数（:）均约为0.6。河流的腐殖化指数（HIX）显著大于湖泊（<0.01）。河流中的DOM主要来自自然保护区的森林土壤，湖泊水质在一定程度上受游客影响。冗余分析结果表明，湖泊中CDOM光谱特征参数受电导率（EC）显著影响（<0.05），河流中受电导率、总溶解氮（DTN）和溶解性有机碳（DOC）显著影响（<0.01）。
