西安都市圈都市农业生态服务功能时空分异

Spatial-temporal variations in ecosystem service of urban agriculture in Xi'an metropolitan zone

都市农业生态服务功能在都市与区域农业互动耦合过程中形成特有的时空变化特征,并影响城乡区域可持续发展。基于30 m×30 m的栅格尺度研究了西安都市圈都市农业生态服务功能的时空分异特征。结果表明,2005-2011年西安都市圈都市农业功能价值总量及密度均呈现从都市圈边缘区向核心区逐渐递减的空间格局。在此期间,功能值密度高值区域分布较稳定,中值区域趋于零散化,低值区域面积收缩明显、破碎化程度逐渐加剧,并且都市农业生态服务功能动态变化具有显著的空间差异性。都市农业生态服务功能地域分异特征及其空间演化格局是区域人口增长、城市化与经济发展、产业结构调整、技术革新等多因素综合作用的结果。

The ecological service of urban agriculture developed a special spatial-temporal pattern during the process of interactive coupling between the city and its regional agriculture. The variations have a large impact on the sustainable development both in the urban and rural areas. Using ArcGIS-based grid （30 m × 30 m） analysis method, we studied the characteristics of spatial-temporal variations in eco-service functions of urban agriculture in Xi＇an metropolitan zone. The results showed that, from the fringe of the metropolitan to its core area, the total value and the density of the urban agriculture eco-service presented a decreasing pattern varying from 2005 to 2011. The dynamic change of eco-service function had a clear spatial pattern. Location of high eco-service density values was relatively stable. Areas of median eco-service value had declined and scattered, low eco-service value areas had severely shrtmk and fragmented. Factors contributing to the formation of the spatial pattern include the regional population increase, urbanization, economic development, industrial restructuring and technical improvement.