Abstract
ABSTRACT Wang, Y. and Wang, Z.-L., 2018. Shifts of sediment microbial community structure along a salinized and degraded river continuum. Succession of sediment microbial community along salinized and degraded river continuums where discharge declines and nutrient loading increases has received little attention. This issue was studied in a 120-km sediment continuum from upstream to estuary of the Jiyun River, northern China. Microbial community was investigated by phospholipid fatty acid (PLFA) analysis and 16S ribosomal ribonucleic acid (rRNA) gene sequencing. Microbial PLFA contents varied from 1.48 to 7.64 nmol g−1. Salinity decreased microbial, bacterial, and actinomycetic PLFA contents (p < 0.05), but had little effect on fungal PLFA contents. Dissolved organic carbon and dissolved nitrogen increased microbial, bacterial, and actinomycetic PLFAs (p < 0.05), but did not affect fungal PLFAs. Fungal PLFAs were mainly associated with the contents of sediment organic carbon (SOC) and total nitrogen (TN). ...
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