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在城乡协调发展的背景下,本文以自然属性为基础分析了北京具有不同经济属性的5类耕地的空间结构。波谱分析显示,不同类型耕地的空间分布具有不同的周期,它们共同形成了距天安门约23～44km(近郊平原)、44～66km(远郊平原)、66～126km(山区)的耕地宏观空间结构。通过计算各类耕地的空间维数和Hurst指数,认为景观农田区、美化农田区、近郊山区22～47km圈层的耕地不具备分形特征;规模农田区、景观廊道带、中远郊山区48～126km圈层的耕地由于受城市发展、自然条件、距离等因素的影响具有明显的分形特征。总体上,北京不同类型的耕地处于一种离散、连续和具有共度性、没有公度性的融合状态。
In the context of the coordinated development of urban and rural areas, this paper analyzes the spatial structure of five types of cultivated land with different economic attributes in Beijing based on the natural attributes. Spectral analysis showed that the spatial distribution of different types of cultivated land had different periods and they formed a macroscopic spatial structure of cultivated land about 23 ~ 44km (suburban plain), 44 ~ 66km (exurban plain) and 66 ~ 126km (mountainous area) from Tiananmen Square. By calculating the spatial dimension and Hurst exponent of various types of arable land, it is considered that the cultivated land in the 22 ~ 47km circle in the landscape farmland, landscaping farmland and suburban mountainous area does not have the fractal characteristics. The farmland area, landscape corridor belt, Due to the urban development, natural conditions, distance and other factors, cultivated land in the 126-km circle has obvious fractal characteristics. In general, different types of cultivated land in Beijing are in a discrete, continuous and communal nature with no degree of integration.