Study On Soil Seed Bank Of Sensitive Section Of "Qing-Yun" Expressway

In this study,through the vegetation and soil sampling test on the sensitive road section of the "Qing-Yun" highway,the characteristics of the soil seed bank and the above-ground vegetation,and the relationship between the two,were proposed,so as to propose the protection of plants and topsoil resources in highway construction Countermeasures.The research results can be applied to the restoration and reconstruction of vegetation on highway roads,which is of great value in protecting local species and accelerating the restoration of plants in roads,and provides a scientific basis for building a “green highway” in Guangdong Province.The main results are as follows:(1)A total of 83 species of plants belonging to 45 genera and 70 genera are collected on the ground.The life forms of the species are mainly shrubs and trees.The predominant families are Gramineae and Rubiaceae.Jade leaf golden flower and fossil mother are the dominant species.In the process of vegetation restoration on sensitive sections of highway roads,you can refer to the species composition of aboveground vegetation to select native plants to restore native vegetation to the greatest extent and protect species diversity.(2)A total of 72 plants belonging to 65 genera and 33 families are counted in the soil seed bank,most of which are herbaceous plants.The dominant families are Gramineae and Asteraceae,and the dominant genera are Cerastium and Polygonum.When using the soil seed bank for vegetation restoration,shrubs and trees should be added appropriately to increase the stability of the ecosystem.(3)The reserve of the soil seed bank is between 0-11479.2 grains/?,and the reserve of each plot varies significantly according to the sampling season.The seed reserves and fern reserves of the soil seed bank in autumn are significantly more than those in spring.The fern seed reserves account for a large proportion and are concentrated in the 4 and 5 areas.In spring,the species life form of the soil seed bank is dominated by annual herbs,and in autumn,the species life form of the soil seed bank is dominated by perennial herbs.(4)Most soil seeds exist in the 0-10 cm soil layer,and some herbaceous seeds exist in the 10-20 cm soil layer in autumn.The herb seeds found in the deep soil of this experiment may be affected by the soil erosion in the Meiyu season in Guangdongand the accelerated burial process of the typhoon,so that some seeds were transferred from the surface soil to the deep soil and accumulated continuously,increasing the number of 10-20 cm soil seeds.Lay the foundation for the formation of a durable seed bank.(5)The Shannon-wiener diversity index of the soil seed bank is between0-0.8913,and the diversity index decreases after accounting for ferns;the Margalef richness index is between 0-4.4516,which is basically not affected by ferns.The richness index of the soil seed bank sampled in autumn is about 4 times that in spring;the Pielou evenness index is between 0.3319-1.The uniformity level of the autumn soil seed bank is higher than that of the spring soil seed bank.The index has decreased.The species diversity of the 4 standard 1 is at the lowest level in spring and autumn.In the restoration of road vegetation,it is more advantageous to use the autumn soil seed bank,but for the 4 standard 1,the spring soil seed bank should be preferred.In practical application,it is necessary to reasonably allocate the spring and autumn soil seed banks according to different conditions,speed up the vegetation restoration of the expressway,and improve the plant community diversity and ecological stability.(6)The total aboveground vegetation in spring and autumn is composed of 45 families,70 genera and 83 species of plants,and the integrated soil seed bank in spring and autumn is composed of 33 families and 65 genera and 72 species.There are 18 species,15 genera and 14 species of plants.The Sorenson similarity coefficient of the soil seed bank and aboveground vegetation is between 0-0.31,and the overall similarity is low,which may be affected by factors such as the obstruction of litter and seed rain;the similarity of the soil seed bank and aboveground vegetation in autumn The coefficient is significantly smaller than in spring.In the process of vegetation renewal and restoration,the introduction of native plant species should be based on aboveground vegetation,so that vegetation restoration can better conform to natural succession.