坝上地区孤石牧场土壤种子库与地上植被的关系

为探讨退耕地植被恢复过程和植被稳定性,采取土壤采样分析与现场植物测定相结合的方法,研究坝上孤石牧场退耕地和过牧地上植被与种子库的变化特征.结果表明:1)退耕地地上植被与土壤种子库物种多样性高于过牧地,退耕地正处于一年生草本植物向多年生草本恢复演替阶段;2)退耕地地上植被与土壤种子库物种丰富度大于过牧地地上植被与土壤种子库的丰富度;3)地上植被与土壤种子库共有种数在退耕地上较多,在过牧地上较少,从而导致了地上植被与土壤种子库群落组成的相异性增大.

Relationship between seed bank and vegetation in Bashang region

Through soil seed bank anlysis and vegetation restoration determination in Bashang region of Hebei province,the change characteristics and relationship between soil seed bank and plant species above the ground were studied for discussing the process of vegetation restoration and its stability in old-field.There were some results showed as below:1)Species diversity of vegetation and soil seed bank in old-field was higher than that in over-grazed field,in which its succession stage was from annual herbaceous plant to perennial herbaceous plant;2)Both richness indexes of species in the seed bank and above-ground vegetation of the old-field(25,20) had increased over that in overgrazed pature field(16,17);3) The number of co-occurring species both in the soil seed bank and aboveground vegetation in the old field(8 species) was more than that in control field(3 species),which led to decrease in compositional similarity between the seed bank and the vegetation.