We evaluate and analyze urban agriculture focusing on the relationship among its subsystems and the effect intensity.The results show that comprehensive evaluation index of urban agriculture increases steadily and keeps a positive tendency.Comparative advantages of both population and social subsystem are weakened since the loss of agricultural labor force and the urban-rural income gap,while the function of environment subsystem and resource subsystem is enhanced and promots urban agricultural mode transformation from the leading mode of economic subsystem to that of both environment and economic subsystems.With the increasing pressure of environment and resource,it is necessary for Beijing to build ecological urban agriculture system and get rid of the industrial way.%以支撑都市农业发展的各子系统协调关系和作用强度为研究焦点,对2004-2011年北京都市农业进行评价分析.研究表明,在子系统全面强化作用下,都市农业综合评价指数稳步上升,整体发展态势良好.由于农业劳动力流失和城乡收入差距影响,人口-社会子系统的比较优势消弱,而资源环境子系统的作用强度凸显,促进了都市农业发展模式由经济子系统主导向资源环境-经济系统“双翼”驱动转变.随着未来资源环境压力逐渐加大,北京应积极构建“生态型”都市农业体系,加快摆脱“工业化”路径.
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