Ecological products refer to the natural elements crucial for sustaining life support systems, ecological regulation functions, and environmental comfort. These products encompass clean air, water, pollution-free soil, lush forests, and maintaining favorable climates. In this study, we assessed the spatial distribution of ecosystem service functions in the Jizhou District of Tianjin using the suitability evaluation method, InVEST model calculations, and ArcGIS spatial visualization analysis. This study operates within the framework of “ecological industry selection”, involving suitability evaluations for ecological product development, and formulates industrial development planning and control strategies. To construct the evaluation index system for exploiting and utilizing ecological products in the Jizhou District, three key aspects were considered: ecosystem services, land use, and limiting factors. Leveraging the district’s resource endowments, this study conducted a quantitative analysis of the spatial distribution pattern of ecological product exploitation potential. The findings revealed a regional aggregation characteristic in the development potential of ecological products. The appropriate direction for developing eco-agriculture, eco-industry, eco-health, and eco-compensation products in the Jizhou district is influenced by the spatial distribution of ecosystem service functions. Building upon the analysis, specific types of ecological products suitable for development in the Jizhou District were further identified. By evaluating the suitability of ecological product development and utilization and verifying the results through industrial model division, the mechanism for comprehending the value of ecological products was realized. This study contributes to the realization of the “two mountains” ideology, wherein the transformation of green water and green mountains into assets of economic value is emphasized, thus fostering sustainable development practices.

Sediment dredging and aeration are used as important technical measures to remediate internal loading of sediment in polluted rivers. However, previous studies have overlooked the impact of dredging and aeration on Greenhouse gases (GHGs) emission. We established three aeration rate(six different aeration intervals), one dredging treatment to investigate the effect of aeration and dredging on pollutant removals and CO₂, CH₄ and N₂O emissions. The results indicated the pollutants and GHGs at 2.4, 3.4, 4.4 L min⁻¹ aeration rates reached collaborative emission reduction after more than 3 h or within 1.5 h. Meanwhile, the GHGs fluxes after aeration decreased with the increasing aeration rate, with the mean CO₂, CH₄ and N₂O fluxes of 69.74, 0.16, 7.53 mg m⁻² h⁻¹ and 33.64, 0.09, 4.17 mg m⁻² h⁻¹ before and after aeration, respectively. With respect to dredging, the pollutants and N₂O reached synergic effects between reduction of pollution and carbon emissions after 1 h dredging. Specifically, the CO₂ and CH₄ emissions after dredging was lower than those of before dredging, but the N₂O emissions was higher than those of before dredging. In addition, our analysis revealed that the dissolved oxygen (DO), oxidation-reduction potential (ORP), available potassium (AK) and ammoniacal nitrogen (NH₄⁺-N) in the sediment influenced GHGs fluxes at the water-air interface in the aeration. Our study indicated moderate aeration and dredging can achieve the synergistic effect in reducing pollution and carbon emissions.

Grazing exclusion (GE) and rest grazing (RG) are important management systems for the restoration of degraded grassland ecosystems. In order to evaluate the effects and mechanisms of different grazing management systems on the scale dependency of species diversity, plant community indices and soil variables were determined in 32 plots in the Qilian Mountains in Gansu Province. The results show that diversity effects and their regulating mechanisms had space-scale dependence under different grazing management systems. The species richness and species diversity indices of RG grassland were significantly higher than those of GE at the regional scale. Species richness for RG and GE plots was 128 and 98, respectively, and the Shannon–Wiener and Simpson indices for RG and GE plots were 2.26 and 2.16, and 0.85 and 0.83, respectively. Additionally, three grazing management systems had a significant effect on species richness in mountain meadows, but different management systems had significantly different effects on species diversity indices in mountain meadows and temperate steppes. Meanwhile, soil variables only influenced species diversity at the regional scale. Most of the plant and soil variables at each scale had positive effects on species diversity. However, a negative correlation was seen between biodiversity and species coverage, mean plant height, soil porosity (SP) and bulk density (BD) under the two contrasting grazing management systems. In conclusion, choosing RG at the regional scale and selecting grazing management systems according to different grassland types at the local scale can help to restore degraded grassland vegetation.

Rising atmospheric carbon dioxide (CO₂) enhances C₃ photosynthesis and often improves intrinsic water-use efficiency, yet the extent to which this physiological potential translates into durable agronomic and ecological benefits remains uncertain. This review integrates evidence from controlled environments, free-air CO₂ enrichment experiments, field studies, and modelling to evaluate the mechanisms, constraints, and applications of CO₂ fertilization. We synthesize this evidence within a cascade-filtering framework that follows carbon gain from leaf photosynthesis through whole-plant allocation, resource limitation, environmental stress, and belowground processes to realized outcomes. Three major conclusions emerge from this review. First, leaf-level photosynthetic gains are progressively attenuated by photosynthetic acclimation, source–sink limitation, nutrient shortage, and water and heat stress, so biomass and harvestable-yield responses are smaller and more variable. Second, yield gains can coincide with lower protein, iron, and zinc concentrations, making nutrient yield as important as mass yield. Third, greater carbon input belowground does not guarantee persistent soil-carbon storage because allocation, turnover, and rhizosphere priming determine retention. In controlled-environment agriculture, enrichment is most effective when CO₂ supply is coordinated with light, climate, water, nutrients, crop load, energy use, and gas delivery. Future progress requires multi-factor, multi-year, genotype-resolved studies that link physiology with nutritional quality, soil processes, modelling, life-cycle impacts, and economics.

Grazing exclusion (GE) and rest grazing (RG) are important management to restore grassland ecosystems. In order to evaluate the effects and mechanisms of different grazing management on species diversity, vegetation community indices and soil variables were determined in the plots of Qilian Mountains in Gansu Province. The results showed that diversity effects and their regulating mechanisms had space-scale dependence under different grazing management. Species richness and species diversity indices of RG in grassland were significantly higher than that of GE at the regional scale. Additionally, three grazing management in mountain meadows had only a significant effect on species richness, but different management in mountain meadows and temperate steppes had a significantly different effect on species diversity indices. Meanwhile, soil variables only influenced species diversity at the regional scale. Most of community and soil variables at each scale had positive effects on species diversity, except that the direction of biodiversity effects was negative for species coverage, mean plant height, soil porosity (SK) and bulk density (BD) under two contrasting grazing management. In conclusion, choosing RG at the regional scale and select grazing management according to different grassland types at the local scale to restore degraded grassland vegetation.