Root carboxylate release of native plants in the Hengduan Mountains: Insights from X-ray fluorescence results on leaf manganese concentrations in herbarium specimens - Guixian Zheng; Yanliang Wang; Erman Xie; Jing Yuan; Jian Zhan; Meng Yang; Xuewei Hu; Xuedan Xie; Fuqiang Yu; Hans Lambers (Soil Ecology Letters, 2026)