Tidal　wetland　plants　can　maintain　high　primary　productivity　under　salinization,　even　with　low　phosphorus　(P)　availability.　However,　little　is　known　about　how　they　adapt　to　salinization-induced　ecosystem　P　limitation　over　time.　We　established　mesocosms　using　tidal　freshwater　wetland　soils　and　the　salt-tolerant　plant　Cyperus　malaccensis　and　subjected　them　to　short-term　(6　months)　and　long-term　(3.5　years)　salinization.　Overall,　short-term　salinization　did　not　change　plant　or　microbial　biomass　nitrogen/P　ratios,　whereas　long-term　salinization　increased　both,　indicating　that　short-term　salinization　did　not　alter　ecosystem　P　limitation,　but　long-term　salinization　exacerbated　it.　Concurrently,　short-term　salinization　reduced　the　moderately　labile　inorganic　P　(Pi)　pool,　whereas　long-term　salinization　also　reduced　the　hydrolyzable　organic　P　(Po)　and　primary　mineral　P　pools.　During　both　short-　and　long-term　salinization,　moderately　labile　Pi　mobilization　exhibited　a　negative　correlation　with　Fe　sulfide　concentration　and　a　positive　correlation　with　Fe(III)　concentrations.　These　results　suggested　that　both　short-　and　long-term　salinization　obtained　P　through　abiotic　P-acquisition　strategies.　Mobilization　of　the　primary　mineral　P　pool　and　hydrolyzable　Po　pools　was　negatively　linked　to　root　arbuscular　mycorrhizal　fungi　(AMF)　biomass　and　soil　alkaline　phosphomonoesterase　(ALP)　activity,　respectively.　This　indicated　that　long-term　salinization　acquired　P　via　biotic　P-acquisition　strategies.　Specifically,　soil　microorganisms　increased　fungi　predominance　and　thereby　increased　ALP　activity　to　convert　hydrolyzable　Po,　while　tidal　wetland　plants　enhanced　root　AMF　associations　to　release　carboxylate　to　transform　primary　mineral　P.　Overall,　our　results　highlight　that　abiotic　P-acquisition　strategies　could　offset　the　ecosystem　P　limitation　during　short-term　salinization,　whereas　biotic　P-acquisition　strategies　play　a　more　important　role　in　soil　P　transformation　under　long-term　salinization.　Through　biotic　P-acquisition,　tidal　wetland　ecosystems　can　maintain　high　plant　primary　productivity　through　biotic　P-acquisition　even　under　P-limited　conditions,　exhibiting　increased　resilience　to　sea-level　rise.　©　2023　The　Author(s)