不同放牧制度对青藏高原东缘高寒草甸土壤种子库的影响

: In order to understand the response of soil seed bank to grazing intensity, we carried out the density, the vertical distribution of soil seed bank and the relationship between soil seed bank and the aboveground vegetations in warm season and cold season pasture of the alpine meadow in the Maqu area of the Qinghai-Tibet plateau. The results showed that: (Effects of Different Grazing Systems on Soil Seed Banks of Alpine Meadow in the Eastern Qinghai - Tibet Plateau1)The richness index R, diversity index H and evenness index E of soil seed bank in light grazing (8 sheep unit/hm2) were higher than the heavy grazing condition (16 sheep unit/hm2); Both the warm season pasture and the cold season pasture, the similarity between soil seed bank and aboveground vegetation under different grazing intensities were lower than 0.3. (2)In the warm season pasture, the density of soil seed bank was 2307.66±90.39 seeds/m2 when light grazing, significantly higher than that of heavy grazing (1065.08±90.39 seeds/m2) (P<0.05). In the cold season pasture, when light grazing density of soil seed bank was 3786.88±376.30 seeds/m2，which was less than that of heavy grazing (5621.15±1253.48 seeds/m2); (3)The plant seeds were mainly concentrated in the soil layer of 0-5cm deep, and the number of seeds decreased rapidly with the increase of soil depth.?????