关键词: 水稻, CO₂浓度增高, 分化, 退化, 颖花

Abstract: From March to October 2012, a sampling plot investigation was conducted on the aquatic plants in the Dianshan Lake, Yuandang, and seven parks landscape waters in Shanghai. The analytic hierarchy process method was also applied to establish an evaluation model of the aquatic plants in landscape waters, aimed to evaluate the aquatic plants configuration in the typical landscape waters in Shanghai. In the study areas, a total of 31 aquatic plant species belonging to 18 families were recorded. The dominated species were of emergent plants, and the complementary species were of floating plants and submerged plants, with the common species being Phragmites australis, Thalia dealbata, and Canna indica. The configuration pattern of the aquatic plants in Dianshan Lake and Yuandang was excellent, with the configured composite index (CI) being 0.93, which was obviously higher than that of the parks landscape waters in Shanghai. Among the seven parks, Shanghai Botany Garden had the CI of 0.89, and its aquatic plants configuration pattern was also at excellent level. Caoyang Park and Xuhui Park were in good level in aquatic plants configuration pattern, Jing’an Park, Jinqiao Park, and Zhabei Park were in medium level, whereas Tianshan Park only had a CI of 0.22, indicating that its aquatic plants configuration pattern was the worst.