It　is　becoming　increasingly　clear　that　plants　can　affect　iron　(Fe)　dynamics　in　tidal　wetland　soils,　but　whether　this　is　rhizosphere　effect-dependent　remains　unclear.　To　assess　rhizosphere　effects　on　soil　Fe　cycling,　in-situ　rhizosphere　and　bulk　soil　samples　(0-60-cm)　were　collected　from　a　tidal　wetland　across　plant　growth　stages　(regreening,　shooting,　and　senescence).　Changes　in　Fe　fractions,　the　abundance　of　Fe-oxidizing/reducing　bacteria　(165　rRNA　gene),　root　morphology　traits,　and　soil　and　porewater　geochemistry　were　examined.　Overall,　the　rhizosphere　effect　decreased　soil　pH　but　increased　the　concentrations　of　dissolved　organic　carbon　(DOC),　porewater　Fe2+,　and　bicarbonates　(HCO3-).　Both　Fe-oxidizing　and　Fe-reducing　bacteria　were　more　enriched　in　the　rhizosphere　than　those　in　the　bulk　soil.　The　rhizosphere　effect　increased　the　concentrations　of　amorphous　and　crystalline　Fe(III),　and　also　enhanced　the　proportion　of　amorphous　Fe(III).　The　rhizosphere　had　higher　concentrations　of　non-sulfidic　ferrous　iron　[Fe(II)]　but　lower　concentrations　of　ferrous　sulfide　(FeS)　and　pyrites　(FeS2)　than　those　in　bulk　soils,　suggesting　that　the　rhizosphere　effect　favors　microbial　Fe(III)　reduction　but　suppresses　microbial　sulfate　reduction.　Moreover,　the　rhizosphere　amorphous　Fe(III)　levels　changed　following　the　patterns　of　root　porosity,　which　attained　peak　values　at　the　root　tips.　The　abundance　of　Fe-reducing　bacteria　was　controlled　by　both　DOC　and　amorphous　Fe(III)　concentrations,　which　were　relatively　higher　during　the　regreening　and　shooting　stages　than　those　during　the　senescence　stage.　Taken　together,　our　findings　highlight　that　the　rhizosphere　effect　transfer　Fe　from　the　bulk　soil　to　the　rhizosphere　and　especially　redirects　it　from　Fe-S　associations　to　microbially-mediated　Fe　redox　cycling.This　rapid　Fe　redoxcy　cling　could　be　responsible　for　buffering　soils　and　organisms　from　sulfide　accumulation　and　stimulate　C　mineralization　in　the　tidal　wetland　ecosystem.　(C)　2020　Elsevier　B.V.　All　tights　reserved.