城市绿地种子库的初步研究

Study on the seed bank of urban green space

对城市绿地土壤种子库的组成、种群数量、空间分布和物种多样性进行了初步研究,结果表明:城市绿地土壤种子库存中共出现植物42种,其中在第一层中共出现植物1477株,多样性指数为2·05,均匀度是0·58,最大的物种多样性指数是3·56,第二层的物种多样性指数,均匀度和最大物种多样性指数均比第一层要低,分别为1·94、0·56和3·47,植物种类也要少一些。城市绿地土壤种子库中种的丰富度、种子苗量、多样性指数均不如远郊区山地天然次生林。城市绿地土壤种子库中蕴藏着一些潜在种群,有些植物种可以用于城市绿化建设。

The soil seed bank composition, the type quantity, the spatial distribution and the species multiplicity of the urban green space were studied, the result shows that 42 kinds of plants appear in the soil seed bank of urban green land, among them 1 477 plants appear in first floor, the diversified index is 2. 05, the degree of consistency is 0. 58, the max diversified index of species is 3.56, second layers of diversified indexes of species, degree of consistency and diversified index of biggest species are lower than the first floor, it is 1.94, 0. 56 and 3.47 respectively, plant kinds should be a little fewer. The abundant degree of plants, seed seedling amount, and the diversified index in the seed bank of the urban green land are lower than the natural second growth forest in outer suburbs. The soil seed bank of urban green land contains some potential populations, some plants can be used for city afforestation.