The study on soil seed bank of cultured grassland on Black Soil Beach

The characteristics of soil seed bank for cultured grassland on Black Soil Beach are studied by germination test methods,such as species composition,density,spatial and temporal patterns and species diversity,to provide a theoretical basis for Dynamic forecast about Community succession and sustainable use of the degraded grassland turned into the cultured grassland on Black Soil Beach in Yellow River source area.The results showed that:(1) There were 36 plant species in the soil seed bank,which belongs to 16 families.(2)Proportion of species and germination in the soil seed present as pattern,perennial herbaceous plants annual biennial herbage plants shrubs.(3) Gramineae are the dominant species in the community of soil seed bank and Fine pasture occupys the largest proportion in economic model(4)For the vertical distribution,the number of seeds in the soil seed bank represent a decreasing trend with soil depth increasing.(5)Margalef abundance index,Shannon-Wiener diversity index and Pielou evenness index tend to decrease with time past in cultured grassland.