关键词: 耕地质量评价, 城市开发边界, 农用地分等定级, 多目标地球化学调查

Abstract:

During the process of urbanization, cultivated land is confronted with new environmental quality and quantity safety issues, so expanding the connotation of cultivated land quality, improving the methods of cultivated land evaluation and exploring its application in the definition of urban development boundary is beneficial to the implementation of the "multi plans in one" strategy and also affects the improvement of safety of agricultural products and quality of people's livelihood. Based on the classification of natural quality of agricultural land and the results of multi-target geochemical survey, with Nantong as an example for verification, this paper restructures the cultivated land quality evaluation methods, sets up the coupling analysis framework between cultivated land quality and planned urban land and explores ways to identify available cultivated land and urban development boundary. Studies have shown that the content of heavy metals in the soil in areas along the Yangtze River is high, the fertility of the soil is poor and the quality of cultivated land is not high in coastal areas and the quality of cultivated land is high in the western and northern parts of the study area. Contrary to the northern part, the areas along the Yangtze River have perfectly matched planned urban land and cultivated land quality distribution and a wide range of available cultivated land and development boundary. The method system composed of cultivated land quality evaluation, coupling of cultivated land and planned urban land and selection of available cultivated land and definition of boundary can support the definition of urban development boundary, but the determination of urban land demand and cultivated land scale needs further study.

Key words: cultivated land quality evaluation, urban development boundary, gradation of agricultural land, multi-target geochemical survey