Dynamics of plant community traits during an 18-year natural restoration in the degraded sandy grassland of Hunshandak Sandland A comparative researches on the development of elm seedlings in four habitats in the Hunshandak Sandland, Inner Mongolia, China An experimental and demonstrational study on restoration of degraded ecosystems in Hunshandak Sandland Hydrological characteristics of different species in three habitats of Hunshandak Sandland DETERMINATION OF THE PRIMARY CORE ZONE OF THE PLANNED HUNSHANDAK NATURE RESERVE Impacts of Human Disturbance on Elms-motte-veldt in Hunshandak Sandland Comparison of photosynthesis and water use efficiency between three plant functional types in Hunshandak sandland