Nitrogen addition reshapes elemental distribution within soil aggregates: availability and stoichiometry of carbon–nitrogen-phosphorus-sulfur in a mown meadow steppe - Jiayun Zhang; Ruzhen Wang; Xiaoxiao Wang; Shuixia Li; Fengqin Li; Xuanning Guo; Liangchao Jiang; Jishuai Su; Yuge Zhang; Xingguo Han; Yong Jiang; Heyong Liu (Plant and Soil, 2026)