Keywords: 
• forest ecology /
• seed bank /
• natural regeneration /
• Pinus sylvestris var. mongolica /
• spatial distribution

Abstract: Pinus sylvestris var. mongolica is adaptive to cold，drought and barren environment，with prominent regeneration ability to wind erosion control and shifting sand fixed. The natural regeneration process of Pinus sylvestris var. mongolica in the sandy land is important to vegetation rehabilitation，degraded ecosystems reconstruction，sustainable sandy ecosystem benefit development，as well as the establishment of green ecological barriers in north of China. In order to explore seed bank and seed falling of Pinus sylvestris var. mongolica，inoculators （specification：1.0 m 1.0 m 0.1 m） were installed at 4，8，12 m in east/south/west/north direction from the mature tree and grids （specification：1 m 1 m） were arranged around the mature tree， and with the vectoring technology get the spatial distribution graph which X axle is north direction axle is east direction. The results showed that Pinus sylvestris var. mongolica seeds disperse mainly in the litter layer with an average seed density of 614 seedsm-2 and in the 0-5 cm horizon with an average seed density of 469 seedsm-2. The amount of seeds in different direction respectively is 6.67 （east）＞6.07（north）＞5.53（west）＞4.63（north）. The primary dispersal concentration was up to about 3 m from the mature tree. Temperate and spatial characteristics of seed falling showed that most seeds were in a region near the mature tree，especially in the 0-8 m range. Conclusions were drawn that the seeds of Pinus sylvestris var. mongolica dispersal density near the observed tree was fan-shaped and composed by winds from the south and west. The horizontal distribution characteristics of seed bank from a nature tree shaped a ring region where seed density was largest from the north to the east with seed density decreasing as the distance increased from the mature tree.［Ch，4 fig. 1 tab. 18 ref.］