鄂尔多斯市是黄河流域重要的草原荒漠过渡带和农牧交错带,研究其生态质量变化对支持黄河流域生态保护和高质量发展具有重要意义.以MODIS遥感影像为数据源,通过改进常规归一化及主成分方法,计算鄂尔多斯市基线遥感生态指数(Baseline remote sensing ecological index,B_RSEI),分析该区域2001-2019年的生态质量时空变化特征.结果表明:(1)B_RSEI具有稳定的方向性和整体性,能更好地反映生态质量长时序变化,2001-2019年鄂尔多斯市B_RSEI呈现起伏增长和东高西低的空间分异性.(2)地表含水量指数是促进B_RSEI的主要因素,是解释B_RSEI分布的主要单因子,地表温度是抑制B_RSEI的主要因素,其交互作用最大.(3)鄂尔多斯生态质量以改善为主,占总面积的67.13%,准格尔旗、康巴什区、伊金霍洛旗地区生态治理效果显著.研究表明鄂尔多斯市生态质量整体改善,B_RSEI有利于分析生态质量年际变化,为鄂尔多斯市生态治理和黄河流域高质量发展提供参考依据.
Ordos City is an important steppe desert and agropastoral ecotone in the Yellow River Basin,China.Studying the changes in ecological quality in Ordos City is important for supporting the ecological conservation and high-quality development of the Yellow River Basin.Herein,the remote sensing imagery of a moderate-reso-lution imaging spectroradiometer was used as a data source to calculate the baseline remote sensing ecological in-dex(B_RSEI)of Ordos City by improving the conventional normalization and principal component analysis.This study also analyzes the characteristics of ecological quality changes from 2001 to 2019.The results indicate the following:(1)B_RSEI exhibits stable directionality and integrity,offering an enhanced reflection of long-term changes in ecological quality.From 2001 to 2019,B_RSEI of Ordos City showed a fluctuating increase and a spatial differentiation of higher in the east and lower in the west.(2)The surface water content index(SWCI)is the primary factor promoting B_RSEI and serves as the main factor explaining the B_RSEI distribution.The land surface temperature(LST)is the main factor inhibiting B_RSEI,with its most substantial interaction.(3)The eco-logical quality of Ordos City has improved,covering 67.13%of the total area,with notable ecological manage-ment effects in the Jungar Banner,Kangbashen District,and Ejin Horo Banner areas.This study demonstrates an overall improvement in the ecological quality of Ordos City,emphasizing the usefulness of B_RSEI in analyzing interannual changes.This could provide a reference for the ecological governance of the Ordos City and high-quality development of the Yellow River Basin.