Lv Xiaolong, Lei Lingyi, Wang Feipeng, Li Rongmao, Li Cong, Lin Hua, Zhang Zhi, Mu Jingli
College of Resources and Environment, Fujian Agriculture and Forestry University, Fuzhou, 350002, China; Fujian Key Laboratory on Conservation and Sustainable Utilization of Marine Biodiversity, College of Geography and Oceanography, Minjiang University, Fuzhou, 350108, China.
Fujian Key Laboratory on Conservation and Sustainable Utilization of Marine Biodiversity, College of Geography and Oceanography, Minjiang University, Fuzhou, 350108, China; College of Environmental & Safety Engineering, Fuzhou University, Fuzhou, 350108, China.
Mar Environ Res. 2025 Oct;211:107420. doi: 10.1016/j.marenvres.2025.107420. Epub 2025 Aug 5.
In the present study, a survey on the aquacultural environment and distribution characteristics of organic carbon were conducted in a typical mariculture bay of southeast China from January to August 2023. The spatio-temporal dynamics and sources of dissolved organic carbon (DOC) and particulate organic carbon (POC) were investigated, as well as the impact of mariculture on the coastal carbon cycles. The results showed that concentrations of DOC ranged from 0.488 mg/L to 2.674 mg/L, with an average of 1.118 ± 0.458 mg/L, being lowest in January and highest in August. DOC increased from the channel to the estuary in January and March, while the estuary was a high-value area in April. Then DOC concentrations decreased from west to east in May and June, while in August, DOC demonstrated an increasing trend from the west to the east. The concentrations of POC ranged from 0.012 mg/L to 0.309 mg/L, with an average of 0.091 ± 0.054 mg/L, being lowest in March and highest in June. POC increased from east to west. The highest concentrations of DOC and POC were found at bivalve and kelp cultivation areas. The non-culture area had the lowest concentrations of DOC and POC. The concentrations of POC in the bivalve-kelp multi-trophic aquaculture area were reduced by 19.063 % and 24.711 % compared to single bivalve or macroalgae aquaculture, respectively. Preliminary analysis of the source of organic carbon based on correlation analysis, C/N, POC/Chl-a ratios showed that the living phytoplankton and degraded organic matter were the main source of DOC. The sources of POC included microbial-derived organic matter, primary production and runoff inputs. This study provides a scientific basis for environmental management and planning of aquaculture in the semi-closed bays.
在本研究中，于2023年1月至8月对中国东南部一个典型的海水养殖海湾的养殖环境和有机碳分布特征进行了调查。研究了溶解有机碳（DOC）和颗粒有机碳（POC）的时空动态及来源，以及海水养殖对海岸碳循环的影响。结果表明，DOC浓度范围为0.488毫克/升至2.674毫克/升，平均为1.118±0.458毫克/升，1月最低，8月最高。1月和3月DOC从海峡向河口增加，而4月河口是高值区。5月和6月DOC浓度从西向东降低，而8月DOC呈从西向东增加的趋势。POC浓度范围为0.012毫克/升至0.
