Microbially Induced Soil Colloidal Phosphorus Mobilization Under Anoxic Conditions

• DOI: 10.1021/acs.est.3c10022
• Publication Date: 2024-04-22T10:49:00Z
• Authors: Kamel M. Eltohamy; Daniel Menezes-Bl...; Erwin Klumpp; Chunlong Liu; Junwei Jin; Chaogang Xing; Yuanyuan Lu; Xinqiang Liang
• Keywords: Mobilization

Understanding the behavior of colloidal phosphorus (Pcoll) under anoxic conditions is pivotal for addressing soil (P) mobilization and transport its impact on nutrient cycling. Our study investigated Pcoll dynamics in acidic floodplain during a 30-day flooding event. The sudden oxic-to-anoxic shift led to significant rise pore-water levels, which exceeded soluble P levels by more than 2.7-fold. Colloidal fractions transitioned from dispersed forms (<220 nm) colloid-associated microaggregates (>220 nm), as confirmed electron microscopy. observed increase sizes was paralleled their heightened ability form aggregates. Compared sterile control conditions, anoxia prompted transformation initially colloids into larger particles through microbial activity. Curiously, 16S rRNA ITS diversity analysis indicated that fungi were strongly associated with anoxia-induced release bacteria. These microbially induced shifts lead higher mobility transport, direct implications floodwaters.