College of Geography and Environmental Science Normal University 730070;
School of Environmental Sciences of Guelph Stone Road East N1G 2W1;
Key Laboratory of Eco-Functional Polymer Materials of the Ministry of Education Normal University 730070;
Key Laboratory of Resource Environment and Sustainable Development of Oasis of Geography and Environmental Science Normal University 730070;
alpine area; environmental changes; leaf elements; nutrient limitation; Qilian Mountains;