Xiong Pan1,2, Li Lin3,4, Zhuo Huang1,2, Min Liu1,2, Lei Dong1,2, Jin Chen2,5, John Crittenden6. 1. Basin Water Environmental Research Department, Changjiang River Scientific Research Institute, Wuhan, 430010, Hubei, China. 2. Key Lab of Basin Water Resource and Eco-Environmental Science in Hubei Province, Wuhan, 430010, Hubei, China. 3. Basin Water Environmental Research Department, Changjiang River Scientific Research Institute, Wuhan, 430010, Hubei, China. linli1229@hotmail.com. 4. Key Lab of Basin Water Resource and Eco-Environmental Science in Hubei Province, Wuhan, 430010, Hubei, China. linli1229@hotmail.com. 5. Administration office, Changjiang River Scientific Research Institute, Wuhan, 430010, Hubei, China. 6. Brook Byers Institute of Sustainable Systems, School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, GA, 30332, USA.
Abstract
Erhai is a famous tectonic rift lake in China. In this study, the distribution of nitrogen and phosphorus species in Erhai sediment cores and their ecology risk were evaluated. The total nitrogen (TN) in the sediment cores ranged from 1583.3 to 8018.5 mg/kg. Nitrogen (N) was still accumulating in the sediment. For depths of 0 to 25 cm, the TN decreased dramatically and for deeper depths the TN got stabilized. The proportions of various N fractions in the sediments of the study areas ranked as follows: the strong oxidation extractable N (SOEF-N) > the weak acid extractable N (WAEF-N) > the strong alkali extractable N (SAEF-N) > the ion-exchangeable N (IEF-N). The total phosphorus (TP) ranged from 814.9 to 1442.3 mg/kg. The vertical distribution of each fraction of phosphorus showed that there were different sources of sediment phosphorus around the Erhai Lake. The results of nitrogen and phosphorus pollution evaluation in sediments by single pollution standard index method showed that the standard index of the TN (STN) ranged from 4.29 to 14.01, and the standard index of the TP (STP) ranged from 1.69 to 2.18. It illustrated that N and P in the sediments were the serious ecological pollution risks in Erhai Lake.
Erhai is a famous tectonic rift lake in China. In this study, the distribution of nitrogen and n>an class="Chemical">phosphorus species in Erhai sediment cores and their ecology risk were evaluated. The total nitrogen (TN) in the sediment cores ranged from 1583.3 to 8018.5 mg/kg. Nitrogen (N) was still accumulating in the sediment. For depths of 0 to 25 cm, the TN decreased dramatically and for deeper depths the TN got stabilized. The proportions of various N fractions in the sediments of the study areas ranked as follows: the strong oxidation extractable N (SOEF-N) > the weak acid extractable N (WAEF-N) > the strong alkali extractable N (SAEF-N) > the ion-exchangeable N (IEF-N). The total phosphorus (TP) ranged from 814.9 to 1442.3 mg/kg. The vertical distribution of each fraction of phosphorus showed that there were different sources of sediment phosphorus around the Erhai Lake. The results of nitrogen and phosphorus pollution evaluation in sediments by single pollution standard index method showed that the standard index of the TN (STN) ranged from 4.29 to 14.01, and the standard index of the TP (STP) ranged from 1.69 to 2.18. It illustrated that N and P in the sediments were the serious ecological pollution risks in Erhai Lake.
Authors: Suduan Hu; Tianxiang Wang; Shiguo Xu; Lingxiao Ma; And Xinguo Sun Journal: Int J Environ Res Public Health Date: 2019-09-08 Impact factor: 3.390