Two treatment methods on Ulva prolifera bloom result in distinctively different ecological effects in coastal environment

Green tides Ulva prolifera have broken out in the Yellow Sea for more than 10 years, becoming a periodic ecological disaster. The largest-ever green tide that occurred 2021 promoted innovation treatment methods. Different from traditional harvest-disposal method, microbial complex formulation was firstly sprayed on harvest U. promotes rapid degradation, and then fermented disposed into sea. At present, little known about effects of those different In order to examine this hypothesis, we run an in-lab incubation 60 days simulate two methods degrade , with focuses degradation ensued impacts water quality. process fresh over months dominated by continuous slow release DOM, concentration DOM column hardly observed decrease within months. pre-discomposed-disposal method also significantly altered community structure. pre-decomposing formulations destroyed cell tissues changed its physical state seawater floating fast depositing, increased rate 14 times. decomposition released bioactive organic matter consumed substantial amount dissolved oxygen local seawater, which has potential risk causing hypoxia acidification short-term. pre-decomposition could be practical efficient countermeasures blooming. After complete pre-decomposed resulting increase TA resist acidification. Overall, compared harvest-packing-disposal pre-decomposing-disposal is environmental-friendly disposal deal “green tide”, but it should used cautiously.