Key Laboratory of the Ministry of Education for Coastal and Wetland Ecosystems, College of the Environment and Ecology, Xiamen University, Xiamen, Fujian, China.
Third Institute of Oceanography, Ministry of Natural Resources, Xiamen, Fujian, China.
Environ Pollut. 2024 Apr 1;346:123672. doi: 10.1016/j.envpol.2024.123672. Epub 2024 Feb 28.
Dredging wastewater (DW) from aquaculture ponds is a major disturbance factor in mangrove management, and its effects on the greenhouse gas (GHG) fluxes from mangrove sediment remain controversial. In this study, we investigated GHG (NO, CH, and CO) fluxes from mangrove sediment at typical aquaculture pond-mangrove sites that were stimulated by DW discharged for different input histories and from different farm types. The GHG fluxes exhibited differing cumulative effects with increasing periods of DW input. The NO and CH fluxes from mangrove sediment that received DW inputs for 17 y increased by ∼10 and ∼1.5 times, respectively, whereas the CO flux from mangrove sediment that received DW inputs for 11 y increased by ∼1 time. The effect of DW from shrimp ponds on the NO flux was significantly larger than those of DW from fish/crab ponds and razor clam ponds. Moreover, the total global warming potentials (GWPs) at the field sites with DW inputs increased by 29-129% of which the CO flux was the main contributor to the GWP (85-96%). NO as a proportion of CO-equivalent flux increased from 2% to 12%, indicating that NO was an important contributor to the increase in GWP. Overall, DW increased the GHG fluxes from mangrove sediments, indicating that the contribution of mangroves to climate warming was enhanced under DW input. It also implies that the carbon sequestration potential of mangrove sediments may be threatened to some extent. Therefore, future assessments of the carbon sequestration capacity of mangroves at regional or global scales should consider this phenomenon.
养殖池塘疏浚废水（DW）是红树林管理的主要干扰因素，但其对红树林沉积物温室气体（GHG）通量的影响仍存在争议。在这项研究中，我们调查了受不同输入历史和不同养殖类型 DW 排放刺激的典型养殖池塘-红树林地点的红树林沉积物中的 GHG（NO、CH 和 CO）通量。GHG 通量随着 DW 输入时间的增加表现出不同的累积效应。接收 DW 输入 17 年的红树林沉积物的 NO 和 CH 通量分别增加了约 10 倍和 1.5 倍，而接收 DW 输入 11 年的红树林沉积物的 CO 通量增加了约 1 倍。虾塘 DW 对 NO 通量的影响明显大于鱼塘/蟹塘和文蛤塘 DW 的影响。此外，DW 输入的田间地点的总全球变暖潜势（GWP）增加了 29-129%，其中 CO 通量是 GWP 的主要贡献者（85-96%）。NO 作为 CO 当量通量的比例从 2%增加到 12%，表明 NO 是 GWP 增加的重要贡献者。总体而言，DW 增加了红树林沉积物中的 GHG 通量，表明在 DW 输入下，红树林对气候变暖的贡献增强。这也意味着红树林沉积物的碳固存潜力可能在某种程度上受到威胁。因此，未来在区域或全球范围内评估红树林的碳固存能力时，应考虑到这一现象。
