关键词: 尿素, 土壤, pH, 活性铝

Abstract: Supported by GIS, the recreational pressure of urban parks in Shenyang was studied by using distance decay model combined with Voronoi graph. The results showed that the total recreational pressure of urban parks in Shenyang did not display obvious difference between downtown and suburban area, but the total recreational pressure of urban parks in the northwestern part of the city was higher than that in its southeastern part. Zhongshan Park, Xinhua Park, Laodong Park, Shifu Square, and Wanliutang Park suffered from the highest total recreational pressure, while Xinhua Park, Shifu Square, Bayi Park, Shenhai Park, and Fenglu Park suffered more urban park area-weighted recreational pressure. An obvious difference in area-weighted recreational pressure was observed between the parks in downtown and suburban area. The combination of distance decay model and Voronoi graph could overcome the shortcomings of distance decay model or Voronoi graph alone, being able to effectively measure the intensity of the recreational disturbances of urban parks, and to evaluate the service pressure of other urban service facilities. The related information acquired in this study could provide references for optimizing the spatial distribution of urban parks in Shenyang and making effective management plans for the urban parks in the City.

Key words: Urea, Soil, pH, Active Al