Sedimentary records of environmental changes in the mussel farming area of Lyuhua Island

doi:10.3969/j.issn.1000-5641.2025.02.008

Abstract

Abstract:

This study aimed to investigate the environmental changes in the mussel farming area of Lyuhua Island since the marine aquaculture boom in Shengsi County in 2000. Sedimentary records were established for a sediment core in the bay south of Lyuhua Island. Notably, compared to before 2000, the total nitrogen (TN) content decreased by approximately 23%, and total phosphorus (TP) content also slightly declined, suggesting a decrease in the nutrient levels in the study area. In addition, the stable isotope ratio of organic carbon (δ¹³Corg) became lighter after the year 2000, indicating a reduction in primary productivity. Combined with dating and grain size composition analysis, the sedimentary environment in this study area was relatively stable. The study area is within the influence range of the Changjiang Diluted Water. However, TN and δ¹³Corg showed a significant decreasing trend on the sediment surface. These results suggest that the decrease in nutrient levels in the study area can be primarily attributed to removing nutrients by mussel harvesting.

Key words: Lyuhua Island, mussel farming, sedimentary record, biogenic components

CLC Number:

Meiqun XIAO, Bing DENG, Guosen ZHANG, Jinzhou DU, Qianqian BI. Sedimentary records of environmental changes in the mussel farming area of Lyuhua Island[J]. J* E* C* N* U* N* S*, 2025, 2025(2): 77-85.

Figures/Tables 5

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