Effects of grassland afforestation with Mongolian pine on soil chemical and biological properties in Keerqin Sandy Land. Variation of competition intensity across a chronosequence in surface fire-mediated Mongolian pine forest VARIATIONS OF SPATIAL PATTERN IN FIRE-MEDIATED MONGOLIAN PINE FOREST, HULUN BUIR SAND REGION, INNER MONGOLIA, CHINA Simulation of individual tree growth of Mongolian pine forest in sandy land Simulation of canopy interception by Mongolian pine Fire history of Mongolian pine (Pinus sylvestris var. mongolica) forests in Mengkeshan of Tahe, China Natural regeneration barriers of Pinus sylvestris var. mongolica plantations in southern Keerqin sandy land, China