TY - JOUR
T1 - Microbially Induced Soil Colloidal Phosphorus Mobilization Under Anoxic Conditions
AU - Eltohamy, Kamel M.
AU - Menezes-Blackburn, Daniel
AU - Klumpp, Erwin
AU - Liu, Chunlong
AU - Jin, Junwei
AU - Xing, Chaogang
AU - Lu, Yuanyuan
AU - Liang, Xinqiang
N1 - Publisher Copyright:
© 2024 American Chemical Society.
PY - 2023
Y1 - 2023
N2 - Understanding the behavior of colloidal phosphorus (Pcoll) under anoxic conditions is pivotal for addressing soil phosphorus (P) mobilization and transport and its impact on nutrient cycling. Our study investigated Pcoll dynamics in acidic floodplain soil during a 30-day flooding event. The sudden oxic-to-anoxic shift led to a significant rise in pore-water Pcoll levels, which exceeded soluble P levels by more than 2.7-fold. Colloidal fractions transitioned from dispersed forms (<220 nm) to colloid-associated microaggregates (>220 nm), as confirmed by electron microscopy. The observed increase in colloidal sizes was paralleled by their heightened ability to form aggregates. Compared to sterile control conditions, anoxia prompted the transformation of initially dispersed colloids into larger particles through microbial activity. Curiously, the 16S rRNA and ITS microbial diversity analysis indicated that fungi were more strongly associated with anoxia-induced colloidal release than bacteria. These microbially induced shifts in Pcoll lead to its higher mobility and transport, with direct implications for P release from soil into floodwaters.
AB - Understanding the behavior of colloidal phosphorus (Pcoll) under anoxic conditions is pivotal for addressing soil phosphorus (P) mobilization and transport and its impact on nutrient cycling. Our study investigated Pcoll dynamics in acidic floodplain soil during a 30-day flooding event. The sudden oxic-to-anoxic shift led to a significant rise in pore-water Pcoll levels, which exceeded soluble P levels by more than 2.7-fold. Colloidal fractions transitioned from dispersed forms (<220 nm) to colloid-associated microaggregates (>220 nm), as confirmed by electron microscopy. The observed increase in colloidal sizes was paralleled by their heightened ability to form aggregates. Compared to sterile control conditions, anoxia prompted the transformation of initially dispersed colloids into larger particles through microbial activity. Curiously, the 16S rRNA and ITS microbial diversity analysis indicated that fungi were more strongly associated with anoxia-induced colloidal release than bacteria. These microbially induced shifts in Pcoll lead to its higher mobility and transport, with direct implications for P release from soil into floodwaters.
KW - anoxic conditions
KW - colloidal phosphorus
KW - floodplain soils
KW - microbe-associated colloids
KW - phosphorus mobilization
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U2 - 10.1021/acs.est.3c10022
DO - 10.1021/acs.est.3c10022
M3 - Article
C2 - 38647007
AN - SCOPUS:85191145728
SN - 0013-936X
JO - Environmental Science and Technology
JF - Environmental Science and Technology
ER -