Microbial community composition and activity controls phosphorus transformation in rhizosphere soils of the Yeyahu Wetland in Beijing, China

Abstract

Microorganisms in the rhizosphere of wetland plants can have a significant impact on phosphorus (P) interception. We investigated the seasonal pattern of microbial community structure and its relationship with different P forms in the rhizosphere of three plants Scirpus planiculmis, Zizania latifolia, and Phragmites australis from the Yeyahu Wetland, China. Chloroform fumigation-extraction was used to determine the soil microbial biomass P (SMBP) and phospholipid fatty acids (PLFA) were used to characterize microbial community composition. P fractions in rhizosphere soil samples were also observed using sequential chemical fractionation. Results showed that the average total PLFA (TPLFA) contents of rhizosphere soils ranged from 34.9 to 40.7nmol·g and were highest in summer. Bacteria were predominant in the rhizospheres of all three plants, accounting for >63% of TPLFA. Aerobic bacteria, represented by 16:0 PLFA, were most abundant. Both organic P (OP) and inorganic P (IP) accumulated in the rhizosphere during the winter die-back phase. Furthermore, both TPLFA and bacterial PLFA decreased with increases in highly resistant OP (HR-OP), occluded P (Oc-P) and Calcium-bound P (Ca-P). This suggests that bacteria play an important role in P transformation and can make use of various P forms. We also found that SMBP was significantly negatively correlated with labile OP (L-OP), moderately labile OP (ML-OP) and HR-OP, reflecting a high degree of cross correlation between SMBP and the PLFA indices.

Long‐term degradation from marshes into meadows shifts microbial functional diversity of soil phosphorus cycling in an alpine wetland of the Tibetan Plateau

“…Previous studies have demonstrated that genes related to the P‐uptake and transport system are mainly controlled by soil P supply (Santos‐Torres et al, 2021). In the marsh soils with lower AP, the relative abundance of the gene pit was higher than that in the meadow (Figure 2), which may have been due to the activation of the low‐affinity IP uptake and transport system under low‐P condition (Song et al, 2014; Teng et al, 2018). When soil P supply increased in the meadow, the expression of the ino transporter system increased to utilize inositol‐phosphate, whose immobilization and availability were enhanced under the elevated soil pH (Wang et al, 2018; Zhang et al, 2017).…”

“…Second, unlike crop soils and grassland soils, the investigated marsh and meadow soils possessed a high content of OP. When the marsh degradation into meadow occurred, OP mineralization may have exceeded the IP solubilization, which could be confirmed by the higher relative abundance of genes involved in OP mineralization than in IP solubilization (Rawat et al, 2021; Teng et al, 2018). As for the taxonomic contribution to the PQQ‐GDH genes, Proteobacteria and Actinobacteria were the dominant microbial phyla.…”

“…Genes coding for alkaline phosphatase were promoted when soil pH increased in the meadow soils (Figure 4 and Figure S5). Because alkaline phosphatase contributes greatly to the mineralization of soil OP (mainly phosphomonoesters) into IP, the enhanced relative abundance of genes (e.g., phoX ) coding for alkaline phosphatase may increase the soil P supply (Bergkemper et al, 2016; Teng et al, 2018). Although IP solubilization genes did not show a significant change when the marsh degraded into meadow, several genes coding for organic acid formation showed significant differences between the marsh and the meadow (Figure 2).…”

Response of Sediment Microbial Communities to the Rural Wastewater in the Pond-Ditch Circulation System

“…was used for anaerobic ammonium-oxidizing in the sludge fermentation reactor (Yang et al, 2011;Ma et al, 2021b). A earlier study reported that rhizosphere bacteria played a pivotal role in regulating the P transformation and can utilize various P forms in wetland plants (Teng et al, 2018). Geobacter and Bacillus.…”

Change in the Distribution of Phosphorus Fractions in Aggregates under Different Land Uses: A Case in Sanjiang Plain, Northeast China

“…The satisfactory P-availability in rice fields can also be attributed to considerable TN and SOM amounts (Table 1). The reason is that TN and SOM can provide abundant nutrients and carbon sources for the growth of microorganisms and indirectly promote the mineralization and decomposition of OP (Hu-P) [42,43]. Fe.Al-P and Hu-P are considered to be moderately-available phosphorus that involves long-term soil phosphorus transformation and act as a buffer for easily-available phosphorus in agro-ecosystems.…”