The source of particulate organic matter and sedimentation organic matter during macroalgal bloom in Yundang Lagoon

ZHENG Xinqing; HUANG Lingfeng; DU Jianguo; LIN Rongcheng

doi:10.3969/j.issn.0253-4193.2013.05.011

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ZHENG Xinqing, HUANG Lingfeng, DU Jianguo, LIN Rongcheng. The source of particulate organic matter and sedimentation organic matter during macroalgal bloom in Yundang Lagoon[J]. Haiyang Xuebao, 2013, 35(5): 102-111. doi: 10.3969/j.issn.0253-4193.2013.05.011

Citation:

ZHENG Xinqing, HUANG Lingfeng, DU Jianguo, LIN Rongcheng. The source of particulate organic matter and sedimentation organic matter during macroalgal bloom in Yundang Lagoon[J]. Haiyang Xuebao, 2013, 35(5): 102-111. doi: 10.3969/j.issn.0253-4193.2013.05.011

Citation:

ZHENG Xinqing, HUANG Lingfeng, DU Jianguo, LIN Rongcheng. The source of particulate organic matter and sedimentation organic matter during macroalgal bloom in Yundang Lagoon[J]. Haiyang Xuebao, 2013, 35(5): 102-111. doi: 10.3969/j.issn.0253-4193.2013.05.011

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The source of particulate organic matter and sedimentation organic matter during macroalgal bloom in Yundang Lagoon

doi: 10.3969/j.issn.0253-4193.2013.05.011

1.
Third Institute of Oceanography, State Oceanic Administration, Xiamen 361005, China
2.
College of the Environment and Ecology, Xiamen University, Key Laboratory of Ministry of Education for Coastal and Wetland Ecosystems, Xiamen 361005, China

Received Date: 2012-11-22

Abstract

Abstract

On the basis of the chemical indexes(C_at/N_at and TOC/Chl a) and stable isotope composition (δ¹³C and δ¹⁵N), suspended particulate organic matter (POM) and sedimentation organic matter (SOM) were analyzed during macroalgal bloom in Yundang Lagoon. The results showed that POM in the lagoon was mainly from the terrestrial origin inputs. In diversion canal close to coastal water, POM was largely composed of terrestrial organic matter from Xiamen Western Sea, while in main canal located in upper reaches of the lagoon, domestic sewage was the largest contributor of POM. Although POM in inner and outer lagoon was close to phytoplankton in atom C∶N ratio (C_at/N_at), phytoplankton was only a small part of POM. The results from ISOSOURCE linear mixing model indicated 54%-97% of combined contribution of the input from diversion and main canal to POM in inner lagoon. SOM had many potential sources in the lagoon, but displayed significant spatial difference. SOM was mainly from seaweed and POM in the areas with seaweed canopy, while mainly from POM deposition or benthic microalgae in those areas without seaweed. Our results showed that, in the lagoons where there are many potential organic sources, the chemical composition of organic matter (OM) could not work well in tracing the source of OM compared with stable isotope tracing. However, the analysis based on a variety of indicators may be more accurate and reliable.
- POM,
- C_at/N_at,
- TOC/Chl a,
- δ¹³C

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