基于遥感生态指数改进模型的祁连山国家公园生态环境质量变化  

The changes of ecological environment quality in Qilian Mountain National Park based on the improved model of remote sensing ecological index

作　　者：高翔[1] 闫安 李杰[1] 常舒杭 李秋染 宋晓娇 GAO Xiang;YAN An;LI Jie;CHANG Shu-hang;LI Qiu-ran;SONG Xiao-jiao(College of Earth and Environmental Sciences,Lanzhou University,Lanzhou 730000,China)

机构地区：[1]兰州大学资源环境学院,兰州730000

出　　处：《兰州大学学报（自然科学版）》2024年第6期744-753,共10页Journal of Lanzhou University(Natural Sciences)

基　　金：国家重点研发计划项目(2019YFC0507402)。

摘　　要：基于Google Earth Engine平台,以Landsat TM/OLI遥感影像为基础数据源,运用遥感生态指数(RSEI)改进模型研究祁连山国家公园1988-2020年的生态环境质量变化,引入地理探测器评判影响因子的贡献.结果表明,RSEI改进模型避免了特征向量方向的干扰,能更好地反映生态环境质量状况;近30多年来国家公园RSEI波动上升,表明其生态环境质量整体改善,空间上呈现“东高西低”分布格局,生态环境质量以无显著变化和改善为主,占比分别为70.13%、25.90%;轻微退化与显著退化占比分别为2.19%、1.78%,主要分布在国家公园西北肃北蒙古族自治县境内;森林和灌丛生态环境质量整体稳定改善,草地和荒漠以稳定为主;干度、热度、绿度是影响生态环境质量的关键因素,其交互作用均表现为双因子增强和非线性增强,交互作 用较强的因子组合主要是干度与热度、热度与绿度.Based on the Google Earth Engine platform and using Landsat TM/OLI remote sensing imagery as the primary data source,we employed an improved remote sensing ecological index(RSEI)model to reveal ecological environment quality changes in Qilian Mountain National Park from 1988 to 2020.The geographical detector method was introduced to evaluate the contribution of influencing factors.The results showed that improved RSEI model,by avoiding interference from feature vector directions,better reflects ecological environment quality conditions.Over the past 30 years,the park's RSEI has shown an overall upward trend with fluctuations,indicating an overall improvement in ecological environment quality.The quality exhibits a"high in the east,low in the west"distribution pattern.The ecological environment quality predominantly showed no significant change(70.13%)or improvement(25.90%).Slight degradation and significant degradation accounted for 2.19%and 1.78%respectively,mainly distributed in the northwestern part of the park within Subei Mongol Autonomous County.Forest and shrub ecosystems experienced overall stable improvement in ecological environment quality,while grasslands and deserts mainly remained stable.Dryness,heat,and greenness were identified as key factors influencing ecological environment quality.Their interactions all demonstrated bi-factor enhancement and nonlinear enhancement,with the strongest interactive factor combinations being dryness-heat and heat-greenness.

关 键 词：遥感生态指数改进模型 生态环境质量评价 地理探测器 祁连山国家公园 

分 类 号：X87[环境科学与工程—环境工程]