关键词: 城市化, 城市化, 耕地, 驱动力, 城市辐射, 规划区

Abstract: The purpose of this paper was to find a more suitable nitrogen application system for the cool season turf in Beijing area by using the lysimeter method. The effects of urea application on soil nitrogen and turf growth were studied. In the experimental design, urea application takes three levels: low nitrogen（N 10g m-2）, medium nitrogen（N 25g m-2）, and high nitrogen（N 40g m-2）. All the nitrogen was equally divided into two(spring and fall) application in each treatment. During the field experiments, mixed lawn was fertilized equally twice a year, in spring and in autumn. After fertilized, different treatments had different growing conditions, meanwhile different treatments soil had different nitrogen contents. The result showed that for a good appearance and healthy turf, the proper annual urea application rate was about 62.5g/m2(N 25g m-2). Under the treatment, the grass of the mixed lawn can absorb nitrogen swiftly and grow well. At the same time, the research also showed that there was no positive relationship .between the urea employment level and the content of total nitrogen, ammonium nitrogen and nitric nitrogen content in soil.