Key Laboratory of the Ministry of Education for Coastal and Wetland Ecosystems, College of Environment and Ecology, Xiamen University, Xiamen, Fujian 361102, China.
Fujian Xiamen Environmental Monitoring Central Station, Xing'lin South Road, Xiamen, Fujian 361102, China.
Sci Total Environ. 2024 Oct 15;947:174564. doi: 10.1016/j.scitotenv.2024.174564. Epub 2024 Jul 5.
The bacterial community in sediment serves as an important indicator for assessing the environmental health of river ecosystems. However, the response of bacterial community structure and function in river basin sediment to different land use/cover changes has not been widely studied. To characterize changes in the structure, composition, and function of bacterial communities under different types of land use/cover, we studied the bacterial communities and physicochemical properties of the surface sediments of rivers. Surface sediment in cropland and built-up areas was moderately polluted with cadmium and had high nitrogen and phosphorus levels, which disrupted the stability of bacterial communities. Significant differences in the α-diversity of bacterial communities were observed among different types of land use/cover. Bacterial α-diversity and energy sources were greater in woodlands than in cropland and built-up areas. The functional patterns of bacterial communities were shown that phosphorus levels and abundances of pathogenic bacteria and parasites were higher in cropland than in the other land use/cover types; Urban activities have resulted in the loss of the denitrification function and the accumulation of nitrogen in built-up areas, and bacteria in forested and agricultural areas play an important role in nitrogen degradation. Differences in heavy metal and nutrient inputs driven by land use/cover result in variation in the composition, structure, and function of bacterial communities.
沉积物中的细菌群落是评估河流生态系统环境健康的一个重要指标。然而，流域沉积物中细菌群落结构和功能对不同土地利用/覆盖变化的响应还没有得到广泛研究。为了描述不同土地利用/覆盖类型下细菌群落结构、组成和功能的变化，我们研究了河流表面沉积物中的细菌群落和理化性质。农田和建成区的表层沉积物受到镉的中度污染，且氮、磷水平较高，这破坏了细菌群落的稳定性。不同土地利用/覆盖类型之间的细菌群落 α 多样性存在显著差异。林地的细菌 α 多样性和能源来源大于农田和建成区。细菌群落的功能模式表明，农田的磷水平和致病菌和寄生虫的丰度高于其他土地利用/覆盖类型；城市活动导致了脱氮功能的丧失和建成区氮的积累，森林和农业地区的细菌在氮降解中发挥着重要作用。土地利用/覆盖驱动的重金属和养分输入的差异导致了细菌群落组成、结构和功能的变化。
