Xia Siyi, Zhang Shumeng, Cui Yichong, Gao Zhiwen, Song Kun, Da Liangjun
Zhejiang Tiantong National Forest Ecosystem Observation and Research Station, School of Ecological and Environmental Sciences, East China Normal University, Shanghai, China.
Global Institute for Urban and Regional Sustainability, East China Normal University, Shanghai, China.
PeerJ. 2024 Dec 23;12:e18764. doi: 10.7717/peerj.18764. eCollection 2024.
Urbanization greatly impacts both the diversity of soil seed banks and the spatial dynamics of species. These seed banks serve as a window into the ecological history and potential for recovery in urban wastelands, which are continually evolving due to urbanization. In this study, we selected 24 plots along urban-rural gradients in Shanghai, China. Soil samples were collected from each plot for seed bank germination experiment in both spring and autumn. We tested whether the seed density, species diversity, and composition of soil seed banks in wasteland varied along an urban-rural gradient. The results showed that seed density was higher in autumn than in spring and no significant difference was found along urban-rural gradients. A total of 74 species, belonging to 26 families and 69 genera, was recorded in soil seed banks, in which annuals were the dominant life form and autochory was the dominant dispersal model. The proportion of exotic species was nearly 40%. There is no significant difference along urban-rural gradients for functional composition, species diversity, and species composition, excepting that marginal significant for autumn Shannon-Wiener index and species composition among urban-rural gradients. The relative homogeneity in the seed bank across urban-rural gradients may primarily be due to the young age of the wastelands.
城市化对土壤种子库的多样性和物种的空间动态都有很大影响。这些种子库是了解城市荒地生态历史和恢复潜力的窗口，而城市荒地由于城市化一直在不断演变。在本研究中，我们在中国上海沿城乡梯度选择了24个样地。从每个样地采集土壤样本，用于春季和秋季的种子库发芽实验。我们测试了荒地土壤种子库的种子密度、物种多样性和组成是否沿城乡梯度变化。结果表明，秋季种子密度高于春季，且沿城乡梯度未发现显著差异。在土壤种子库中总共记录了74种植物，隶属于26科69属，其中一年生植物是主要生活型，自体传播是主要传播模式。外来物种的比例接近40%。功能组成、物种多样性和物种组成沿城乡梯度没有显著差异，除了秋季香农-威纳指数和城乡梯度间物种组成存在边缘显著差异。种子库在城乡梯度上的相对同质性可能主要是由于荒地形成时间较短。
