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7 results for “phosphorus utilization”
Data from: Phosphorus storage and utilization strategies of two bloom-forming freshwater cyanobacteria
<p>The inter-relationships between cellular phosphorus (P) storage, dissolved inorganic P (DIP) uptake affinity, alkaline phosphatase activity (APA), and dissolved inorganic nitrogen (DIN) concentrations were studied in two ubiquitous diazotrophic freshwater cyanobacteria, <em>Raphidiopsis raciborskii</em> (six strains) and <em>Chrysosporum ovalisporum</em> (two strains). DIP uptake kinetics were measured using rates of incorporation of the radio-isotope, <sup>33</sup>P, and APA as a proxy for DOP-ester utilization. The study showed that DIP uptake of individual strains followed Michaelis-Menten kinetics (modified in our study to incorporate cellular P quotas), but differed with DIN and P availability, and between growth stages. High-affinity DIP uptake and APA were activated below a P quota threshold of ~0.01 µg P µg<sup>-1</sup> C across the species and strains. <em>C. ovalisporum</em> had significantly higher APA and P quotas (per unit C and cell) but lower uptake affinity than <em>R. raciborskii</em>. Demand for DIP by <em>C.ovalisporum</em> increased when N fixation occurred, but typically not for <em>R.raciborskii</em>. Our results indicate that cyanobacterial species and strains differ in their strategies to P limiting conditions, and highlight the interplay between N and P. Physiological adaptations like APA and diazotrophy of cyanobacteria adapting to low-DIP and/or DIN conditions, may occur simultaneously and drive species dominance in oligotrophic environments.</p>
Data from: Phosphorus storage and utilization strategies of two bloom-forming freshwater cyanobacteria
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Dataset for: Long-term soil warming decreases microbial phosphorus utilization by increasing abiotic phosphorus sorption and losses
<p><span>Phosphorus (P) is an essential and often limiting element that could play a crucial role in terrestrial ecosystem responses to climate warming. However, it has yet remained unclear how different P cycling processes are affected by warming. Here we investigated the response of soil P pools and P cycling processes in a mountain forest after 14 years of soil warming (+4°C). Long-term warming decreased soil total P pools, likely due to higher outputs of P from soils by increasing net plant P uptake and downward transportation of colloidal and particulate P. Warming increased the sorption strength to more recalcitrant soil P fractions (absorbed to iron oxyhydroxides and clays), thereby further reducing bioavailable P in soil solution. As a response, soil microbes enhanced the production of acid phosphatase, though this was not sufficient to avoid decreases of soil bioavailable P and microbial biomass P (and biotic phosphate immobilization). This study therefore highlights how long-term soil warming triggers changes in biotic and abiotic soil P pools and processes, which can potentially aggravate the P constraints of the trees and soil microbes and thereby negatively affect the C sequestration potential of these forests.</span></p>
Dataset for: Long-term soil warming decreases microbial phosphorus utilization by increasing abiotic phosphorus sorption and losses
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Data from: Chemical extraction of phosphorus from dairy manure and utilization of recovered manure solids
<p>This is digital research data corresponding to a published manuscript, <em>Chemical extraction of phosphorus from dairy manure and utilization of recovered manure solids. </em>Agronomy 2020, 10, 1725; doi:10.3390/agronomy10111725</p> <p>Repeated land application of dairy manure can increase soil phosphorus above crop requirements because of manure's low nitrogen (N) to phosphorus (P) ratio (N:P < 4:1). This soil P build-up can lead to off-site P transport and impairment of surface water quality. We evaluated a treatment process to extract P from manures, called Quick Wash, integrated with a double-stage solids separation system to recover coarse and fine manure solids. The Quick Wash process uses a combination of acid, base, and organic polymers to extract and recover P from manures, improving the N:P ratio of recovered manure solids (RMS).</p>
Data from: Plant nitrogen and phosphorus utilization under invasive pressure in a montane ecosystem of tropical China
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Data from: Chemical extraction of phosphorus from dairy manure and utilization of recovered manure solids
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