Assessment method of contribution of shellfish biology deposition to offshore environment sediment organic carbon

Abstract

Disclosed is an assessment method of the contribution of the shellfish biology deposition to the offshore environment sediment organic carbon. The assessment method comprises adopting an indoor simulation experiment, collecting feces of typical shellfishes in different seasons, determining the organic carbon, the total nitrogen and the carbon isotope abundance in the shellfish biology deposition, performing analysis on a large number of data samples and building a shellfish biology sediment organic carbon traceability technology system; combining with the burial characteristics of the offshore culture zone sediment organic carbon and determining a potential source of the culture zone sediment organic carbon through a carbon isotope and carbon nitrogen ratio diagram; estimating the contribution of the shellfish biology deposition to the offshore carbon cycle based on a multiple mixed model. According to the assessment method of the contribution of the shellfish biology deposition to the offshore environment sediment organic carbon, the transition and transformation process of different sources such as the shellfish feces in the marine environment is fully considered and accordingly the final assessment result is close to reality and 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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