Distribution Characteristics of n -alkanes in Sediment Core and Implication of Environment in Different Lakes of Dianchi

• Published in: Huanjing kexue Vol. 37; no. 12; p. 4605
• Main Authors: Yu, Li-Yan, Han, Xiu-Xiu, Huang, Xiao-Hu, Wu, Ya-Lin, Yang, Hao, Huang, Tao, Yu, Yan-Hong, Huang, Chang-Chun
• Format: Journal Article
• Language: Chinese
• Published: China 08.12.2016
• Subjects: Alkanes - analysis; Carbon - analysis; China; Geologic Sediments - chemistry; Lakes - chemistry; Nitrogen - analysis; Plants; Water Pollutants, Chemical - analysis; Lake Dianchi; different lakes; n-alkanes
• ISSN: 0250-3301
• DOI: 10.13227/j.hjkx.201605151

In order to study the composition and environment significance of the organic matter in Lake Dianchi, samples from two sediment cores from the northern and southern parts of the lake were collected in July, 2014. Meanwhile, the vertical distributions of total organiccarbon (TOC), total nitrogen (TN), -alkanes fractions were investigated. The results showed that ① the concentrations of TOC and TN had been clearly increasing since the 1970s, which implied that the primary productivity of Lake Dianchi was continuously enhanced; ② The values of the parameter -C / -C , and CPI indicated the alternation between herbs and woody plants from the bottom up in Lake Dianchi sediments. Besides, the high carbon number of organic matter in sediments mainly originated from endogenous submerged floating and large plants; ③ The index of C/N and distribution characteristics of -alkanes suggested differences in the various sources of organic matter in different lakes. In detail, organic matter came from terrigenous organic matte