[Assessment of soil nutrient status in urban green space of main cities in Hubei Province, China].

According to the topography of the cities in Hubei Province, soil samples were collected from the urban green space in two mountainous cities (Enshi and Shiyan), three hilly cities (Jing-men, Xiangfan and Yichang), and five plain cities (Wuhan, Xiaogan, Xianning, Jingzhou, Suizhou and Huangshi). Within each city, subsoil samples were taken in accordance with four different types of land use, including park, residential, institutional (school, hospital and government, etc.), and roadside. In the main cities in Hubei, the soil pH of urban green space was averagely 7.9, being obviously higher than that of natural soils, while the soil organic matter content was rather low (6.8 g x kg(-1)). The soil available N and P contents were at a low level, while the soil available trace element (Ca, Mg, S, Fe, Cu, Mn, Zn and B) contents were moderate. Land use type had significant effects on the soil nutrient contents in plain cities. The soil pH in the residential green space was significantly higher than that in the park, roadside and institutional green space, while the contents of soil available trace elements (S, Cu, Mn and Zn) in roadside green space were significantly higher than those of green space in the other land use types. Park green space had the lowest soil nutrient contents. There existed significant differences in the soil nutrient contents among the cities with different topography. The soil organic matter, NH4-N, available K and P, and Ca, Mg, S, Fe, Cu and Mn contents were significantly higher in plain cities than in mountainous cities.