关键词: 遗传理论, 水文变异, 水文基因, 水文学原理, 演变规律, 非一致性

Abstract: City parks are an important part of urban green space, and reflect the plant diversity of the city. In this study, the typical quadrat method was employed to investigate the present situation of plan diversity with 420 quadrats from 10 major parks in Haikou, which were divided into two groups as seaside parks and inland parks according to their distances to the coastal line. The plant species constitution and α and β diversity indexes within these two groups were compared. The results showed that 320 vascular plant species belonging to 244 genera in 88 families were identified in Haikou city parks. However, the richness of plant species differed among different parks. The cultivated species took the main part in the inland parks and the wild and alien ones took the main part in the seaside parks. The α diversity index of plant communities in the inland parks was higher than that in the seaside parks. Compared with the inland parks, the seaside parks possessed a higher α diversity index in herb layer and shrub layer, and a lower α diversity index in tree layer. The similarity of β diversity indexes of tree layer and shrub layer were the lowest and the one of herb layer was the highest between the two types of parks. Habitat difference and human disturbance were considered important factors causing the divergence in urban plant diversity in Haikou.

Key words: evolution law, hydrological variability, inheritance theory, inconsistent., hydrological gene, principle of hydrology