Yanying Yang

Unsustainable land-use transitions in peri-urban watersheds threaten both food security and ecological integrity. While Patch-generating Land Use Simulation (PLUS) and Integrated Valuation of Ecosystem Services and Trade-offs (InVEST) models for ecosystem service (ES) assessment are commonly integrated, limited studies have simultaneously (i) accounted for multiple real-world spatial policies (e.g., ecological redlines) as hard constraints, (ii) targeted a comprehensive suite of ESs, and (iii) explicitly pursued synergies without relying on large-scale land conversion. To address these gaps, we developed a spatially explicit framework that integrates the PLUS and InVEST models to simulate four land-use scenarios and assess six ESs—grain yield, water yield, nitrogen export, phosphorus export, soil conservation, and carbon sequestration—in the Yuqiao Reservoir watershed, China, during 1990–2030. Against a backdrop of historical declines in cropland/grassland and key ESs due to construction expansion (1990–2020), the novel Comprehensive Development scenario—implementing slope-adaptive management and riparian buffers—synergistically increases grain yield (+0.55%) and carbon sequestration (+1.10%) while drastically reducing phosphorus export (−10.86%). It demonstrates that synergistic gains can arise from strategic spatial reconfiguration within a stable land-use area, advancing a paradigm from area-centric to configuration-centric optimization. This provides a quantifiable methodological basis and actionable policy reference for land spatial optimization in similar water-source watersheds.

The large-scale transformation of natural ecosystems to socio-economic development land types under human activities was a primary reason for the decline of regional ecosystem services. It is a key issue for regional ecosystem planning and management to reveal the relationship between ecosystem services of different land use types under different socio-economic driving degrees. However, the current related research was not in-depth. Based on the land use data of Wuhan City in 1980, 1990, 2000, 2010, and 2020, this study classified land use into three categories according to the different degrees of human activities on natural ecosystem development: the land use of a natural ecosystem (LUNE), the land use of a productive ecosystem (LUPE), and the land use of a socio-economic system (LUSE). The InVEST model was used to simulate five ecosystem services (grain yield, water yield, carbon storage, habitat quality, and water purification), and the spatio-temporal distribution and functional transformation of the three land use types were analyzed. Results showed that with the intensified urban expansion in Wuhan, the LUSE types increased to 2.7 times that of the original. However, the natural land types basically maintained a stable area, coupling with the large-scale transformation between the LUPE and LUSE types. Land use change resulted in significant spatial changes of five ecosystem services, especially carbon storage and habitat quality. The correlation analysis indicated that the five kinds of ecosystem services mainly showed a synergistic relationship, meanwhile the LUSE type denoted the most significant correlation with ecosystem services among these three category types. This study indicated that besides the protection of natural ecosystems, the LUSE type would become the key land use type in the planning and management of improving regional ecological function.

Trade-offs between eco-environment protection and socioeconomic development hinder the success of sustainable development goals (SDGs). Solutions based on ecosystem services (ESs) provide the co-benefits and pathways for fulfilling the SDGs. However, assessing the progress towards SDGs based on the contribution of ESs to SDGs is lacking. Here we assessed the spatial-temporal changes of ecosystem service values (ESV) and the SDG scores in the Beijing-Tianjin-Hebei region (BTH) over the past 20 years using “ES-SDG linkages.” The total ESV and ES-SDG Index score in the BTH showed a spatial pattern of high values in the northern plateau and low values in the southern plain. The total ESV increased from 25,335 yuan ha⁻¹ in 2000 to 27,344 yuan ha⁻¹ in 2020, mainly attributed to water provision and water regulation. The decrease of cropland, grassland, and wetland in the BTH between 2000 and 2010 caused a decrease in the value of nine ESs, whereas the increase of forestland, waterbodies and wetland between 2010 and 2020 contributed to an increase in the value of seven ESs. The ES-SDG Index score decreased slightly from 36.8 in 2000 to 35.5 in 2010, and then increased to 36.0 in 2020 due to the control of rapid urbanization and strengthen of ecological restoration. Our study indicates that the changes of ES-SDG Index score mainly depended on food provision, water provision, climate regulation, nutrient cycling, habitat & biodiversity, and cultural services. The assessment of SDGs suggests that SDG6, SDG11, and SDG12 should be prioritized to advance the synergistic development of SDGs in the BTH, which will also enhance the understanding of stakeholders about the progress of achieving SDGs.