A method for assessing the contribution of shellfish biodeposition to organic carbon in offshore environmental sediments

Abstract

A method for assessing the contribution of shellfish biodeposition to the organic carbon of offshore environmental sediments. First, indoor simulation experiments are used to collect the excrement of typical shellfish in different seasons, and the organic carbon, total nitrogen, and carbon isotope abundance in shellfish biodeposits are determined. Analyze a large number of data samples to build a technical system for traceability of organic carbon in shellfish biosediment; combine the burial characteristics of organic carbon in offshore aquaculture area sediments, use carbon isotope and carbon-nitrogen ratio relationship diagrams to determine the potential source of organic carbon in aquaculture area sediments , finally estimating the contribution of shellfish biodeposition to the offshore carbon cycle based on a multivariate mixture model. The invention fully considers the migration and transformation process of different sources such as shellfish excrement in the marine environment, so that the final evaluation result is closer to reality and more reasonable.

Description

technical field [0001] The invention belongs to the technical field of environmental monitoring, and in particular relates to a method for evaluating the contribution of shellfish biological deposition to the organic carbon of offshore environmental sediments. Background technique [0002] The ocean system is the largest carbon pool in the world, and the carbon storage in the ocean is about 3.8×10 13 t is more than 50 times that of the atmosphere. Therefore, the ocean carbon cycle is an important part of the global carbon cycle, which to a large extent determines the trend of global temperature and climate changes and the direction of changes in the marine ecological environment. The marginal sea of ​​the continental shelf is the connecting zone between the land and the ocean. It is an area where the marine carbon cycle is extremely active. It is greatly affected by human production and life, aquaculture activities, and terrestrial input. Therefore, its biogeochemical cycle ...

AI Technical Summary

Problems solved by technology

In recent years, domestic and foreign use of δ 13 C and C / N methods have been used to determine the source of organic matter in marine sediments. Some studies have been carried out, mainly focusing on the contribution of marine and terrigenous sources to sediment organic matter, but there is no report on the contribution of shellfish biodeposition to the offshore carbon cycle.

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