Impacts of saltwater intrusion on soil nematodes community in alluvial and acid sulfate soils in paddy rice fields in the Vietnamese Mekong Delta

Saltwater intrusion is a potential risk damaging crop diversity and productivity due to degraded soil physicochemical properties. However, little known about how salinity affects the structure function of nematodes community in intensive rice cultivated area. This study aimed (1) assess impacts saltwater on nematode alluvial acid sulfate soils; (2) evaluate its relation with conditions. reduced abundance both free-living (FLN) plant-parasitic (dominated by Hirschmanniella) soils. FLN was different among sites The omnivorous genera Aporcelaimellus Thornenema were only found non-salt-affected soil, whilst Mesodorylaimus dominant salt-affected suggesting that this genus might be tolerant higher EC soluble Na+, K+, Ca2+. bacterivorous (dominant taxa Chronogaster, Rhabdolaimus) non-salt affected soils, which accounted for 48% 40%, respectively, it 21% soil. fungivorous (Aphelenchoides, Ditylenchus, Filenchus) greater contrast other treatments, these low pH. biological (Margalef, Shannon-Wiener, Hill’s indices), maturity index (?MI, MI25), clearly functional guilds community, especially c-p 5 group suggests showed degradation properties, as indicated altered trophic structure, their ecological indices paddy fields.