基于土地评价的基本农田划定方法

摘要

In order to achieve the destination that both quality and quantity of the prime farmland are important in the demarcation of prime farmland. Taking Donggang, Liaoning province as an example, with the help of GIS technology,considering the viewpoint of natural conditions and site conditions, this paper selected the slope of land, scale, trafficlocarion, the conditions of irrigation, land types which are adjacent to its suitability as evaluation thctors to establish a demarcation method for prime farmland with the principle of grading according to quality based on load evaluation The results indicated that the cultivated lands in Donggang with evaluafion scorns above 90 points were less, which only accounted thr 23.73％ of total cultivated lands and scattered in the whole area irregulariy, The farmlands with evaluation scores above 70 points were tile ideal prime famland protection areas, which could make protection ratio of basic farmland meet thc national requirement indicators. Thc empirical research shows that the method can reduce disturbances of human factors in the demarcation of prime farmland and make the demarcation ef prime farmland more scientific and reasonable%为了在基本农田划定中实现数量与质量并重的目标,该文以辽宁省东港市为例,借助GIS技术,从耕地的自然条件和立地条件两方面考虑,选取耕地等别、坡度、道路通达度、水利设施状况以及与相邻土地利用类型的适宜性等因素作为评价指标,建立一种以土地评价为基础的"按质定量"的基本农田划定方法.研究结果表明:东港市评价分值≥90分的耕地较少,只占耕地总面积的23.73%,且无规律地散步在整个区域内;若使其基本农田保护率达到国家规定的指标,评价分值≥70分的耕地区域是理想的基本农田保护区.实证研究表明此种方法可以减少基本农田划定中人为因素的干扰,使得基本农田的划定更为科学合理.