Zhejiang Province Key Laboratory of Mariculture and Enhancement, Zhejiang Marine Fisheries Research Institute, Zhoushan 316021, PR China.
Zhejiang Province Key Laboratory of Mariculture and Enhancement, Zhejiang Marine Fisheries Research Institute, Zhoushan 316021, PR China.
Sci Total Environ. 2022 Jul 10;829:154610. doi: 10.1016/j.scitotenv.2022.154610. Epub 2022 Mar 18.
The CO and CH fluxes across the water-air interface were determined in two groups of swimming crab (Portunus trituberculatus)-ridgetail white prawn (Exopalaemon carinicauda) polyculture ponds. One group of ponds with sediment improver application were referred to as SAPs, and the other group receiving no sediment improver were as NSPs. During the farming season, both the SAPs and NSPs acted as CO sinks and CH sources. The cumulative CO-C fluxes from the SAPs and NSPs were -26.78 and -23.49 g m, respectively, and the cumulative CH-C emissions from the SAPs and NSPs were 0.24 and 0.28 g m, respectively. CO fluxes were significantly related to net primary production and water pH, and CH fluxes were mainly regulated by water temperature during the farming season. The application of the oxidation-based sediment improver had a positive effect on reducing the CH emissions across the water-air interface but had no effect on CO fluxes. The sediment improver reduced the organic matter contents and improved the sediment pH and redox potential, which may have facilitated a decrease in CH production in the sediment. The CO produced through the oxidation of organic material in the sediment may have been absorbed by strong photosynthesis, resulting in a nonsignificant difference in CO fluxes between the SAPs and NSPs. The results indicated that the application of sediment improvers in coastal polyculture ponds can reduce carbon emissions, especially CH emissions, during the farming period and could help mitigate global warming with regard to the sustained-flux global warming potential (SGWP) and sustained-flux global cooling potential (SGCP) models over a 20-year time horizon. Future studies on the CO and CH production rates of the sediment and the related microbial community could improve our understanding of the effect mechanism of the application of sediment improvers on CO and CH emissions from mariculture ponds.
在两组养殖三疣梭子蟹（Portunus trituberculatus）-脊尾白虾（Exopalaemon carinicauda）混养池塘中，测定了水-气界面的 CO 和 CH 通量。一组池塘施用底质改良剂，称为 SAPs，另一组池塘未施用底质改良剂，称为 NSPs。在养殖季节，SAPs 和 NSPs 均为 CO 汇和 CH 源。SAPs 和 NSPs 的累积 CO-C 通量分别为-26.78 和-23.49 g m，累积 CH-C 排放量分别为 0.24 和 0.28 g m。CO 通量与净初级生产力和水 pH 显著相关，而 CH 通量主要受养殖季节水温调节。氧化型底质改良剂的应用对减少水-气界面 CH 排放有积极影响，但对 CO 通量没有影响。底质改良剂降低了有机质含量，提高了底质 pH 和氧化还原电位，这可能促进了底质 CH 产量的减少。通过底质中有机物质氧化产生的 CO 可能被强烈的光合作用吸收，导致 SAPs 和 NSPs 之间 CO 通量无显著差异。结果表明，在沿海混养池塘中应用底质改良剂可以减少养殖期的碳排放，特别是 CH 排放，可以根据持续通量全球变暖潜势（SGWP）和持续通量全球冷却潜势（SGCP）模型，在 20 年时间跨度内缓解全球变暖。未来关于沉积物中 CO 和 CH 生成速率及其相关微生物群落的研究，可以加深我们对底质改良剂应用对海水养殖池塘 CO 和 CH 排放影响机制的理解。
