The effect of soil organic matter on long-term availability of phosphorus in soil: Evaluation in a biological P mining experiment

Hawkins, J. M. B.; Vermeiren, Charlotte; Blackwell, Martin; Darch, Tegan; Granger, Steve; Dunham, S. J.; Hernández-Allica, Javier; Smolders, Erik; McGrath, Steve P.

doi:10.1016/j.geoderma.2022.115965

Cited by 9 publications

(3 citation statements)

References 62 publications

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“…The bonds between Pi and Fe oxyhydroxides are extremely stable in acidic soils, implying a slower P return via desorption to the soil solution within long-term warming (Torrent et al, 1990). This is partially supported by the increase in Fe oxide content extracted with oxalic acid under warming (Table S3), which raises abiotic P immobilization to form NaOH-Pi (Figure S7, Florea et al, 2024;Hawkins et al, 2022). Besides, Ca 2+ could play a major role in Pi precipitation in the form of Ca-apatite, which has very low solubility in soils with pH above 7.0 and might act as another geochemical sink [Ca 10 (PO 4 ) 6 (OH) 2 ] (Tunesi et al, 1999).…”

Section: Response Of Soil P Availability To Climate Changementioning

confidence: 95%

Microbial phosphorus‐cycling genes in soil under global change

Wang,

Guo,

Wang

et al. 2024

Global Change Biology

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The ongoing climate change on the Tibetan Plateau, leading to warming and precipitation anomalies, modifies phosphorus (P) cycling in alpine meadow soils. However, the interactions and cascading effects of warming and precipitation changes on the key “extracellular” and “intracellular” P cycling genes (PCGs) of bacteria are largely unknown for these P‐limited ecosystems. We used metagenomics to analyze the individual and combined effects of warming and altered precipitation on soil PCGs and P transformation in a manipulation experiment. Warming and increased precipitation raised Olsen‐P (bioavailable P, AP) by 13% and 20%, respectively, mainly caused by augmented hydrolysis of organic P compounds (NaOH‐Po). The decreased precipitation reduced soil AP by 5.3%. The richness and abundance of the PCGs' community in soils on the cold Tibetan plateau were more sensitive to warming than altered precipitation. The abundance of PCGs and P cycling processes decreased under the influence of individual climate change factors (i.e., warming and altered precipitation alone), except for the warming combined with increased precipitation. Pyruvate metabolism, phosphotransferase system, oxidative phosphorylation, and purine metabolism (all “intracellular” PCG) were closely correlated with P pools under climate change conditions. Specifically, warming recruited bacteria with the phoD and phoX genes, which encode enzymes responsible for phosphoester hydrolysis (extracellular P cycling), strongly accelerated organic P mineralization and so, directly impacted P bioavailability in alpine soil. The interactions between warming and altered precipitation profoundly influenced the PCGs' community and facilitated microbial adaptation to these environmental changes. Warming combined with increased precipitation compensated for the detrimental impacts of the individual climate change factors on PCGs. In conclusion, warming combined with rising precipitation has boosting effect on most P‐related functions, leading to the acceleration of P cycling within microbial cells and extracellularly, including mineralization and more available P release for microorganisms and plants in alpine soils.

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Section: Response Of Soil P Availability To Climate Changementioning

confidence: 95%

Microbial phosphorus‐cycling genes in soil under global change

Wang,

Guo,

Wang

et al. 2024

Global Change Biology

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“…We observed that the mobilization of Ca-P by soil pH occurred in soils with relatively low SOC concentrations, which is similar to the research by Yang et al [61], which showed that the effectiveness of some acidic materials (citric, oxalic, and malic acids) in enhancing soil P solubilization was most pronounced in soils with low SOC concentrations. This could be because SOC can prevent the diffusion of P into the soil micropores [62]; conversely, SOC also protects the P in the micropores from mobilization; thus, Ca-P is more prone to being solubilized in soils with low SOC.…”

Section: Effect Of Chemical Fertilizer On Soil P Formsmentioning

confidence: 99%

“…We found that the proportion of NaOH-P i , which was predominant under the NPKM treatments, was positively correlated with Fe p concentration (Figure 6E). The increase in SOC can also create additional P sorption sites by increasing amorphous Fe (hydr)oxides and reducing the aging of P by limiting its diffusion into micropores [62,72]. Interestingly, for the NPKM treatment, it was found that Resin-P i , NaHCO 3 -P i , and NaOH-P i concentrations increased with increasing aggregate size (Figure 4A-C), and SOC, Fe p , Ca, and Mg showed the same regularity (Figure 2B,C,G,H).…”

Section: Effect Of Chemical Fertilizer Combined With Straw or Manure ...mentioning

confidence: 99%

Phosphorus Distribution within Aggregates in Long-Term Fertilized Black Soil: Regulatory Mechanisms of Soil Organic Matter and pH as Key Impact Factors

Zhang,

Wang,

Chen

et al. 2024

Agronomy

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Understanding soil phosphorus (P) distribution and its key drivers is fundamental for sustainable P management. In this study, a 21-year fertilization experiment on black soil was carried out, setting up five fertilization treatments: unfertilized control (CK), nitrogen and potassium (NK), nitrogen, P and potassium (NPK), NPK plus straw (NPKS), and NPK plus manure (NPKM). The distribution and effecting factors of P pools within soil aggregates were investigated. Compared to CK, the NK and NPK treatments decreased calcium-associated P concentration in all aggregate fractions. Meanwhile, the NPK treatment significantly increased the organic P extracted from NaOH in unaggregated particles (<0.053 mm). This was mainly due to the reduction in soil pH. The NPKS and NPKM treatments increased almost all P forms in aggregates, especially Ca-P. For the NPKM treatment, inorganic P extracted from resin, NaHCO3, and NaOH increased as aggregate size increased. This was mainly because straw or manure addition promoted soil organic carbon (SOC) storage in aggregates, creating more sorption sites via association with amorphous metallic minerals, and, thus, facilitating P accumulation. In conclusion, decreasing soil pH by chemical fertilizers is an effective strategy for mobilizing soil P, whereas increasing SOC by straw or manure facilitates P accumulation.

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