Carbohydrate allocation strategies and C/N balance shape root plasticity of urban tree species under ozone stress - Jingwen Fu; Yaowu Tu; Di-Ao Yan; Xinxin Hao; Xizi Wang; Shuangjiang Li; Feiyun Xu; Xiangyang Yuan; Zhaozhong Feng; Shenglan Li (Journal of Environmental Sciences, 2026)