Search

Protecting coastal wetlands and preventing the erosion of tidal flats are major challenges in the most coastal regions of China because of strong anthropogenic influence and ongoing sediment reduction from upstream sources. The Jiuduansha Wetland holds both national and international value. However, there has been a decrease in the accretion rate, leading to the occurrence of marsh and bank erosion along the southern bank section of the wetland. In this study, we examined the effects of various nature-based solutions (Nbs) on the marsh-edge erosion belt, including fencing (F) with environmentally friendly bamboo piles; vegetation planting (V) using native species; fencing and vegetation planting (FV); fencing and sediment addition (FS) using dredged soil; and fencing, vegetation planting, and sediment addition (FSV). The results show that the flat elevation in the early erosion belt continuously declined without any treatment, and the mitigation functions of the different approaches were comparable. The F treatments with single wave barriers could not protect the bank and could even aggravate the degree of erosion over one year. Although exogenetic sediments filled the FS experimental plots, the flat elevation level did not notably increase. When the marsh vegetation was established in the experimental plots (V treatment), notable elevation accretion occurred (2.4 cm year−1), and the FV and FSV treatments further enhanced sedimentary accretion (4.5 cm and 6.4 cm year−1, respectively) and vegetation growth (based on density and biomass), showing positive feedback of hydro-sedimentary and biological processes. The synthesized approach to utilize environmentally friendly wave barriers, establish native vegetation and replenish dredged sediment is recommended to be used in the Nbs that aim at preserving the biogeomorphology of coastal salt marshes in the early erosion stage. • Nature-based solutions were conducted to mitigate erosion trend of coastal wetland. • Single wave barriers could not protect the bank and could even aggravate erosion. • Elevation accretion occurred when vegetation and sediment settled on the mudflat. • Synthesized mitigation approaches are recommended to preserve coastal wetlands. [ABSTRACT FROM AUTHOR]

Abstract: Environmental hormone mainly cause harm to the reproductive function of human being and animal kingdom, which is a serious threat to human and animal survival or reproduction. This paper blacklisted 70 kinds of environmental hormones, studied pollution situation of some environmental hormone (which are remaining in the atmosphere, water, sediment, soil, seafood and human tissue) in Chinese Environment and population, and outlined the environmental hormone pollution hazards. Therefore, China should strengthen basic research in environmental hormone pollution, strengthen the environmental management and the publicity of environmental law to curb environmental hormone pollution. In addition, some legislative measures should be proposed, laws and regulations of environmental hormones should be formulated, and the law enforcement should be strengthen to control environmental hormones. [Copyright &y& Elsevier]

Recruiting native coastal vegetation and preventing the reinvasion of exotic Spartina alterniflora is a major challenge in China, due to harsh tidal environment for vegetation establishment and rapid Spartina colonization. This paper first reviewed the revegetation course of native Scirpus mariqueter in a coastal wetland in the Yangtze Estuary, where the adjacent Spartina was effectively eliminated. From 2014 to 2019, the area of planted Scirpus increased by 26.7 times, and the plant density and biomass growth amounted to the levels of mature sedge community. The establishment of Scirpus promoted the sedimentary accretion with an annual sedimentary rate of 9.2 cm yr−1, which was significantly higher than that in the mudflat. Six years of monitoring revealed that the revegetation approach with belowground propagules (corms) was effective for Scirpus establishment under strong hydrodynamic disturbances in the tidal mudflat because the morphology and germination rate of corms benefited the anchoring function of seedlings. Both recruited Scirpus and the original community expanded constantly due to positive feedback between plant progradation and sedimentary accretion. Then, we implemented a model simulation under the scenario of Spartina retention. The prediction showed that the high-speed invasion of Spartina would colonize and replace the whole Scirpus community in the study area during the period of 2014–2019. Hence, our results highlighted the importance of coupling Scirpus recruitment with Spartina eradication in guaranteeing recolonization of native coastal sedges. As a long-lasting management strategy, unremitting field monitoring and assistant decision-making tools (such as the forecasting models) on Spartina reinvasion risk are highly suggested for preserving the restoration of native marshes. • Rhizocorms of native Scirpus are ideal revegetation material in tidal environment. • Positive feedback between plant and sediment favors both Scirpus and Spartina. • Spartina reinvasion is a high risk for restoration of native Scirpus. • Management strategies are suggested for Scirpus recruitment and Spartina control. [ABSTRACT FROM AUTHOR]