Original ResearchPublished 9 October 2026Spatiotemporal associations between ecosystem service value and human activity intensity: a case study of the Chengdu metropolitan area, ChinaLin Wang · Li Luo · Weijing Zeng · Guanghao Ren · Xiaojun LuoFrontiers in Environmental Sciencedoi 10.3389/fenvs.2026.1989806