青海师范大学学报(自然科学版）

成都市是长江上游重要的生态屏障，揭示成都市生境质量演变规律对该地区生态系统保护与管理具有重要意义.本文基于多源遥感数据，利用InVEST模型、生态贡献率法分析成都市2000—2023年生境质量的时空演变特征，通过空间叠加分析识别生境修复的重点区域，采用随机森林模型探究生境质量的影响因素.结果表明：(1)耕地和林地为成都市的主要地类，研究期内成都市耕地和草地面积呈减少趋势，二者向建设用地与林地分别转入了1 720.83 km²和965.93 km².(2)成都市生境质量呈“两侧高，中间低”分布格局，全域生境质量总体处于中等等级，研究期内生境质量整体呈退化趋势.(3)耕地转变为建设用地是研究区生境退化的主要原因，贡献率在38%以上.生境修复的重点区域主要集中在龙泉山、龙门山生态控制区以及蒲江县、简阳市和彭州市等地.(4)气温、坡度和高程是对生境质量影响最大的三个因素，其中高程和坡度与生境质量呈正相关关系，气温则表现出负相关效应.研究结果可为成都市生态保护规划提供决策和参考.

Chengdu City is an important ecological barrier in the upper reaches of the Yangtze River. Revealing the evolution law of habitat quality in Chengdu City is of great significance for the protection and management of the ecosystem in this area. Based on multi-source remote sensing data, this paper uses InVEST model and ecological contribution rate method to analyze the spatiotemporal evolution characteristics of habitat quality in Chengdu City from 2000 to 2023, identifies the key areas of habitat restoration through spatial overlay analysis, and uses random forest model to explore the influencing factors of habitat quality. The results show that:(1)Cultivated land and forest land are the main land types in Chengdu City. During the study period, the area of cultivated land and grassland in Chengdu City shows a decreasing trend, and these two land types are converted to construction land and forest land by 1 720.83 km² and 965.93 km², respectively.(2)The habitat quality in Chengdu City is “high on both sides and low in the middle” in terms of distribution pattern. The overall habitat quality across the region is at the medium level, and it shows a degradation trend during the study period.(3)The conversion of cultivated land to construction land is the main reason for habitat degradation in the study area, with a contribution rate of over 38%. The key areas of habitat restoration are mainly concentrated in Longquan Mountain, Longmenshan Ecological Control Area, Pujiang County, Jianyang City, Pengzhou City, and other areas.(4)Temperature, slope, and elevation are the three factors that most significantly affect habitat quality. Among them, elevation and slope are positively correlated with habitat quality, while temperature shows a negative correlation effect. The results can provide decision support and reference for ecological protection planning in Chengdu City.