Evaluation on Agronomic Characters of Five Materials of Elymus L.in Alpine Area Temporal-spatial variations of WUE and its response to climate change in alpine area of southwestern China Temporal-spatial variation of heterotrophic respiration in alpine area of southwestern China The effect of different land use patterns on soil properties in alpine areas of eastern Qilian Mountains Temporal-spatial variations of net ecosystem productivity in alpine area of southwestern China Carbon storage and potentials of the broad-leaved forest in alpine region of the Qinghai- Xizang Plateau, China