Investigations were conducted of species composition and abundance of vegetation in suburban agricultural re-gion, Qianjiang, Hubei Province in 1996 and 2013, for the purpose of revealing trend of the temporal-spatial variation of distribution of plant diversity in agricultural landscapes on the background of the development of intensive agriculture and urbanization. Results show that the plant diversity in the studied area as a whole displayed a declining trend from 1996 to 2013; in the cropland habitat, species richness dropped quite fast and species composition tended to be simplified, and e-ven dominant species of the habitats, regardless of type, changed significantly, more in the semi-natural habitat than in the cropland habitat;but the two types of habitats did not differ much in number of agro-tolerant species. In the semi-natu-ral habitat, species richness and species composition did not change much, but urbanization led to loss of some of the semi-natural habitats, which would pose a threat to the maintenance of species composition. These findings indicate that agricultural intensification affected plant diversity in the suburban agricultural landscape significantly. However, the impact was relatively not so strong in the semi-natural habitats as in the cropland habitats. Obviously the semi-natural habitats may play an important role in protecting agriculture landscape plant diversity. Therefore, for conservation of plant diversity in the suburban agricultural landscape, it is essential not only to lower the degree of agricultural intensification by adopting more environment-friendly measures, but also to strengthen conservation of semi-natural habitats in the process of urbaniza-tion.%分别于1996和2013年调查了湖北省潜江市郊区农业景观,研究不同农作生境和半自然生境中植被物种组成和丰富度,以揭示农业集约化和城市化发展背景下农业景观中植物多样性的时空分布变化趋势. 分析显示, 1996到2013年间研究区植物多样性总体呈现下降趋势,其中,农作生境中物种丰富度下降较多,物种组成趋于单一化;各生境优势物种都有明显变化,但相对于农作生境,半自然生境优势物种变化更大;农作生境和半自然生境农田耐受种种数差异不大;半自然生境物种丰富度和植被组成变化不显著,但城市化导致部分半自然生境丧失,可能对物种多样性的维持构成威胁. 这说明近十多年农业集约化对城郊农业景观植物多样性影响显著,但半自然生境中植物多样性相对于农作生境受到的影响较小,可对农业景观中植物多样性的保护发挥重要作用. 因此,城郊农业景观植物多样性的保护,不但需要降低农业集约化,采取环境更加友好型措施,而且需要在城市化进程中加强对半自然生境的保护.
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