黑土侵蚀沟工程治理后生态功能评价OA

As one of the most severe manifestations of land degradation in Northeast China,gully erosion in black soil re-gions poses a major threat to agricultural productivity and ecological stability.Consequently,gully erosion rehabilitation in black soil regions is a critical task for ecological restoration in Northeast China.However,systematic evaluation meth-ods and mechanistic understanding of functional recovery remain insufficient.Based on engineering projects imple-mented between 2022 and 2025 in four typical erosion gullies in Qitaihe City,this study developed an evaluation system comprising 30 indicators covering soil structure,vegetation diversity,and hydrological functions.Using a matter-ele-ment extension model combined with a game-theoretic weighting method,we quantified the post-restoration ecological function levels.The results showed that:(1)Soil structure and mechanical properties were the core driving factors,with<0.6 mm aggregates accounting for 73.13%of the structural weight.(2)Multiscale differentiation of soil func-tions:shear strength and non-capillary porosity dominated overall functionality,medium-sized aggregates played promi-nent roles in segmented zones,while deep-layer fine particles regulated hydrological processes.(3)The ecological func-tion of gullies restored in 2022 and 2024 reached the"excellent"level,with downstream sections significantly outper-forming upstream and midstream areas.The overall excellence rate reached 50%.Our findings highlight that microstruc-tural reconstruction and spatial heterogeneity regulation are key to ecological function recovery in black soil gullies.Moreover,the downstream segments exhibited the most notable restoration outcomes,offering a scientific basis for a"segmented-phase"precision management strategy in black soil regions.