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• W3111439762 endingPage "129210" @default.
• W3111439762 startingPage "129210" @default.
• W3111439762 abstract "As phosphorus (P) losses from Midwestern crop fields degrade water quality in downstream water bodies, the assessment of natural P immobilization in floodplain soils is imperative to reduce P input to the Gulf of Mexico. While the organic C:P ratio of soil is widely accepted as an important indicator of P immobilization, roles of the quality/type of C sources (i.e., foliar C composition and degradability) on soil P dynamics are not clearly understood. The objective of this laboratory incubation study was to assess the influence of leaf residue of native trees (e.g., hackberry, and silver maple) on P reaction dynamics in floodplain soils as a function of C composition (i.e., carbonyl-, alkyl- and aromatic-C) and soil organic C:P ratios. Conventional wet chemical analyses and 31 P NMR spectroscopy were used to understand changes in P speciation and phosphatase activities. During the incubation, at a soil organic C:P of ∼200, residues with low aromaticity promoted P mineralization, as evidenced by a sustained increase in labile inorganic P and decrease in microbial P. Conversely, residues with high aromaticity and hydrophobicity (i.e., silver maple) caused a decrease in labile inorganic P and increase in microbial P under the same soil organic C:P, indicating the dominance of P immobilization. At a soil organic C:P of 300, both sugar maple and silver maple promoted P immobilization. Mineralization rates were of lesser magnitude in the soils amended with silver maple, which interestingly contained the largest proportions of recalcitrant C and the highest ratios of aromaticity and hydrophobicity. • Effects of litter quality on P mineralization were studied in a floodplain soil. • The C:P ratio could not alone explain variations in soil P reaction dynamics. • The amendment of litter with more recalcitrant C dampened P mineralization processes. • Foliar C composition can influence the degradation of organic P." @default.
• W3111439762 created "2020-12-21" @default.
• W3111439762 creator A5002032369 @default.
• W3111439762 creator A5088531333 @default.
• W3111439762 date "2021-03-01" @default.
• W3111439762 modified "2023-10-16" @default.
• W3111439762 title "Effects of native leaf litter amendments on phosphorus mineralization in temperate floodplain soils" @default.
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