Most studies on wetland parks focus on resource surveys and evaluations, park planning and design, and the construction of hardware facilities. Only a few studies have covered tourism experiences. With the rapid development of online media, online text data have become a prominent research direction for tourism experiences. Based on the web text analysis method and importance-performance analysis, Rost Content Mining 6 software was used. This served to analyze word frequency, semantic web analysis, and sentiment analysis, and to explain the web text about Haizhu National Wetland Park. It also helped to find problems experienced by tourists and their underlying reasons and proposed improvement strategies. The results showed that the overall quality of the tourism experience in Haizhu National Wetland Park was relatively high. However, some of the negative comments mainly focused on the lack of humanistic landscape construction, lagging infrastructure, and poor management services. By combining research results, improvement strategies were proposed that addressed infrastructure, management services, scenic spot publicity, ecological environmental protection, and so on. These could help to enhance tourism experiences.

Sediments sampled from the Pearl River tributary inlet, with seriously black and odor problem, was treated with calcium nitrate injection in the river simulator. During the course, release and transformation of nitrogen from sediments was investigated. The results showed that calcium nitrate injection is one kind of feasible approaches for sediments odor control. Removal rate of sulfide in sediments reached up to 99% in a month, the color of sediments turned to light brown from black, and the odor disappeared. However, release of NH4+-N and NO3--N was accelerated with calcium nitrate injection, the maximum release concentration of NH4-N and NO3-N was close to 48 mg/L and 417.4 mg/L with injecting dosing of 8%(W/W, dry-weight). Furthermore, continued aeration to overlying water seemed not to be a good way for NO3-N removal. Contrastively, under low DO condition, both concentration of NH4-N and NO3-N took increasing-decrease trends. In this work, TN concentration decreased from 97.7 mg/L to 27.4 mg/L. That is, by maintaining low DO concentration in sediment-water interface, the extra release of nitrogen caused by calcium nitrate injection could be well controlled.