云南山区城镇建设用地适宜性评价中的特殊因子分析

云南实施“城镇上山”战略的重要基础性支撑是开展山区城镇建设用地适宜性评价。其中的参评因子可分为特殊因子和基本因子2类。根据云南实际，将特殊因子归纳为7个，即:坡度（陡坡）、地质灾害、地震断裂带、重要矿产压覆、基本农田保护、生态环境安全、自然与文化遗产保护，并分别分析了这7个因子对云南山区建设用地适宜性的影响和“刚性”制约作用，进而将云南山区城镇建设适宜土地（简称山区宜建地）定义为:指坡度在8°~25°，并位于地质灾害高危险区、地震断裂带500 m范围区、重要矿产压覆区、基本农田保护区、生态环境安全控制区和自然与文化遗产保护区之外的缓坡地。这为云南省以及其他类似地区开展山区城镇建设用地适宜性评价、推进山地城镇建设提供了基础支撑。

Analysis on the Special Factors for Evaluating Mountainous Urban Construction Land Suitability in Yunnan Province

Evaluating mountainous urban construction land suitability is the crucial foundational support to implementing the strategy of ‘building urban projects on mountain land’ in Yunnan Province. The factors in land suitability evaluation are generally summed up into special factors and element factors. The special factors were divided into slope (steep slope), geological disasters, earthquake fault zone, important mineral overlaying, basic farmland protection, eco-environmental security, and natural and cultural heritage protection based on the reality of Yunnan. Then we gave a separate analysis on the effects of the seven factors on mountainous urban construction land suitability and its rigid restrictive function. Finally, the land suitable for urban construction in mountainous areas of Yunnan Province (or hereinafter referred to as ‘land suitable for construction in mountainous areas’) was defined as the gentle slope area with gradient ranging from 8° to 25°, and that is located outside of zone with high risk of geological disasters, zone with 500 m of seismo-fault, zone of important mineral resources overlaid with construction projects, zone for basic farmland protection, zone for eco-environmental risk control and zone for natural and cultural heritage protection. The result could provide a foundational support to implementing mountainous urban construction land suitability evaluation and promoting mountainous urban construction in Yunnan Province or the similar regions.