Ecology Of Early Spring Ephemerals At The Southern Edge Of Junger Basin

The Ephemerals is a kind of plant starting its new living period using the melting snow water in the early spring. They make use of melting snow water and spring rainwater under certain temperature to grow, then they will finish the life history quickly before hot summer comes. Through a series of experiments and researches are on life cycle, the growth in different landform is different and the environment affect the growth. In the meanwhile Researches on the ecological characteristics of five ephemerals, Lepidium perfoliatum L., Lepidium apetalum Willd., Eremopyrum orientale, Asperugo procumbens shows, the ephemerals have a series ecological characteristics adapting to the environments in temperate arid area: (1) the growth and the growth speed of ephemerals are affected by the environments. (2) It is the tactics of keeping the seed storehouse under the adverse environment that seed spreading has the dispersiveness of time, space heterogeneity of the seed spreading and the dormancy in summer, (3) the seed coat of Lepidium pertoliatum L.and Lepidium apetalum Willd. make the seed bigger, which is useful to promote the seed sprouting and developing of seedling by absorbing the aroundmoisture...