Effects of sand burial on growth and physiological process of Agriophyllum squarrosum seedlings in Horqin Sand Land of Inner Mongolia, North China. Response of the Growth and Photosynthetic Properties of Pinus sylvestris var.mongolica Saplings to Strong Wind-sand Flow Blowing THE EFFECT OF SILVICULTURAL MEASURES ON RADIAL GROWTH PROPERTIES OF PINUS KORAIENSIS PLANTATIONS