Abstract
Environments in both biotic and abiotic ecosystems have been affected by the colonization of non-native flora. In this study, we examined the effect of Bidens alba invasion on different land-use types along a coastline in southern China. Bacterial communities in each site were determined using 16S rDNA sequencing, and soil physicochemical properties were analyzed using standard methods. Although our results indicated that B. alba invasion did not have a significant effect on the alpha diversity of bacteria, it caused significant differences in soil bacterial community composition between invaded and uninvaded soil across different land-use types. Beta diversity and several physicochemical properties in forest, orchard and waterfront environments were recorded to be more susceptible to B. alba invasion. A high proportion of the variation of bacterial communities can be explained by a combination of environmental variables, indicating that environmental selection rather than plant invasion is a more effective process in coastal microbial assemblages. By comparing topological roles of shared OTUs among invaded and uninvaded soil, keystone taxa in invaded soil were identified. Acidobacteria was the major phyla involved in the invasive process which could be driven by environmental selection. How key phyla react in our experiment should be verified by further studies.
Highlights
In conjunction with increasing levels of atmospheric CO2, anthropogenic land-use change and pollution, plant invasion is a key driver of ongoing global change and a major threat to biodiversity [1,2,3]
Relationships between bacterial community and soil chemical properties Physicochemical results (Fig 2) indicated that B. alba invasion was associated with changes in soil physicochemical properties in the different land-use types, notably pH in forest soil (t = 2.1, df = 16, p = 0.05), soil moisture content in farmland soil (t = -2.3, df = 16, p = 0.03), soil electrical conductivity in farmland soil (t = -2.5, df = 16, p = 0.02), total phosphorous in wasteland soil (t = 2.8, df = 16, p = 0.01) and total potassium in waterfront soil (t = 1.8, df = 16, p = 0.08)
Land-use type was negatively correlated with bacteria alpha diversity whilst soil pH and soil electrical conductivity (EC) were positively correlated with microbial phylogenetic diversity
Summary
In conjunction with increasing levels of atmospheric CO2, anthropogenic land-use change and pollution, plant invasion is a key driver of ongoing global change and a major threat to biodiversity [1,2,3]. Plant invasions can potentially alter the structure and function of recipient ecosystems, especially in coastal ecosystems [4, 5]. Invasive plants are characterized as having higher net primary productivity and litter input, thereby reducing. The effect of invasion on soil bacterial communities in coastal ecosystem (2019KJCX015). R. China) provided support by sequencing PCR products. The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript
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