Soil bacterial communities interact with silicon fraction transformation and promote rice yield after long-term straw return

Returning crop straw into the soil is an important practice to balance biogenic and bioavailable silicon (Si) pool in paddy, which crucial for healthy growth of rice. However, owing little knowledge about microbial communities responsible degradation, how return affects Si bioavailability, its uptake, rice yield remains elusive. Herein, we investigate change fractions community a 39-year-old paddy field amended by long-term return. Results show that significantly increased from 29.9% 61.6% 14.5% 23.6%, respectively, when compared NPK fertilization alone. Straw altered abundance. Acidobacteria was positively related amorphous Si, while Rokubacteria at phylum level, Deltaproteobacteria, Holophagae class level negatively organic matter adsorbed Fe/Mn-oxide-combined soils. Redundancy analysis their correlations further demonstrated status explained 12% bacterial variation. These findings suggest bacteria diversity interact with mobility altering transformation, thus resulting various nutrient sources drive biological cycle agroecosystem.