摘要
【目的】为合理布局农村居民点,推进全域乡村规划发展,科学评价农村居民点用地适宜性提供参考。【方法】选取区位条件、生产属性、自然条件、社会经济等4类20个因子,构建农村居民点用地适宜性评价指标体系,选取重庆市合川区1000个农村居民点作为正样本,并按1∶1的比例随机选取1000个非农村居民点作为负样本,基于随机森林算法,构建农村居民点用地适宜性评价模型,利用自然断点法将研究区内农村居民点用地适宜性等级划分为适宜、一般适宜、不适宜共3类,根据评价结果提出合川区农村居民点用地适宜性分区的优化方案。【结果】1)验证模型的有效性,得到训练数据、测试数据、全体数据的曲线下面积值分别为0.999、0.996和0.944,模型测试集最高精度为0.991,表明模型预测准确性高且稳定;2)评价因子中坡度、距农村道路距离和地形起伏度对农村居民点用地适宜性评价结果的影响较大;3)适宜区位于合川区中部、北部地势平缓的丘陵盆地,建议保留发展;一般适宜区多位于西南、东南部,以及距嘉陵江、涪江1000 m范围外,建议内部改造;不适宜区位于南部、东南部岭谷,分布于三江两侧和华蓥山支脉云雾山一带,建议搬迁撤并。【结论】利用随机森林模型进行农村居民点用地适宜性评价的精度较高,可为农村居民点管控提供参考。
[Purposes]In order to rationally lay out rural residential areas and promote the development of rural planning in the whole region, it is very necessary to scientifically evaluate the suitability of rural residential areas. [Methods]It selects 20 factors in 4 aspects, including location conditions, production attributes, natural conditions, and social economy, to construct an evaluation index system for the suitability of rural residential areas, and selects 1 000 rural residential areas in the study area as a positive sample, a negative sample of 1 000 rural settlements is randomly selected in a 1∶1 ratio. Based on the random forest algorithm, a land suitability evaluation model for rural settlements is constructed, and the suitability level of the rural settlements in the study area is divided into suitable ones using the natural breakpoint method. Generally suitable and not suitable for three grades, according to the evaluation results, the optimization plan for the suitability of rural residential land in Hechuan District is proposed. [Findings]1) The effectiveness of the model was verified, and the AUC values of the training data, test data, and overall data were 0.999, 0.996, and 0.944, respectively, and the highest accuracy of the model test was 0.991, indicating that the model prediction accuracy is high and stable. 2) Among the evaluation factors, slope, distance from rural roads, and topographic undulation have a greater impact on the evaluation results of the suitability of rural residential sites. 3) The suitable area is located in the gentle hilly basin in the middle and north of Hechuan District, and it is recommended to keep and develop. Generally suitable areas are mostly located in the southwest and southeast, 1 000 meters away from Jialing River and Fujian River, and internal reconstruction is recommended;unsuitable areas are located in the south and southeast ridges and valleys and water systems, distributed on both sides of the Sanjiang River and the Huaying Mountain branch Yunwushan area. I
作者
李林芝
陈星宇
张虹
孙德亮
文海家
陈爽
LI Linzhi;CHEN Xingyu;ZHANG Hong;SUN Deliang;WEN Haijia;CHEN Shuang(The Key Laboratory of GIS Application Research,Chongqing Normal University,Chongqing 401331;Key Laboratory of New Technology for Construction of Cities in Mountain Area,Ministry of Education,Chongqing University,Chongqing 400045;Chongqing Planning&Design Research Institute,Chongqing 401147,China)
出处
《重庆师范大学学报（自然科学版）》
CAS
北大核心
2022年第3期93-104,共12页
Journal of Chongqing Normal University:Natural Science
基金
国家自然科学基金(No.41807498,No.42071217)
重庆市自然科学基金(No.cstc2020jcyj-msxmX0841)
重庆市人文社科重点研究基地项目(No.19JD030)
重庆市教育委员会科学技术研究项目(No.KJQN202000525)
国家社会科学基金(No.19XGL027)。
关键词
随机森林算法
因子分类
用地适宜性评价
农村居民点
合川
random forest algorithm
factor classification
land use suitability evaluation
rural residential area
Hechuan
