Context dependencies in the responses of plant biomass and surface soil organic carbon content to nitrogen addition and precipitation change within alpine grasslands - Fawei Zhang; Hongqin Li; Jingbin Zhu; Chunyu Wang; Yunlong He; Juntao Zhu; Qiang Yu; Huakun Zhou; Yingnian Li; Naishen Liang (Agriculture, Ecosystems & Environment, 2025)