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4 results for “soil P cycle”
Salinity effects on soil P cycling
<p><span>Accelerated sea-level rise is expected to cause the salinization of freshwater wetlands, but the responses to salinity of the availability of soil phosphorus (P) and of microbial genes involved in the cycling and transformation of P remain unexplored. Our results suggest that the P-cycling microbial community abundance and P availability respond positively to moderate increases in salinity by promoting the microbial solubilization and mineralization of soil P in brackish wetlands. Changes in microbial communities and microbially mediated P cycling may represent microbial strategies to adapt to moderate salinity levels, which in turn control soil function and nutrient balance.</span></p>
Salinity effects on soil P cycling
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Soil carbon, nitrogen, and phosphorus cycling microbial populations and their resistance to global change depend on C:N:P stoichiometry
<p><span>Maintaining the stability of ecosystem functions to global change calls for a better understanding the regulatory factors of functionally specialized microbial-groups and their population-response to disturbance. Here, we explored this issue by collecting soils from 54 managed ecosystems in China and building a predictive model of microcosm experiments. <span>S</span><span>oil carbon:nitrogen:phosphorus (C:N:P) stoichiometry</span> <span>(3</span><span>5</span><span>%~4</span><span>9</span><span>%)</span> imparted a greater individual effects on the abundances of microbial-groups associated with main carbon C, N, and P biogeochemical processes in comparison with geographical conditions <span>(7%~10%).</span> <span>Soil</span><span> total </span><span>C </span><span>and N </span><span>content</span><span>s were</span><span> significantly positively correlated with the abundances of </span><span>d</span><span>iazotrophs</span><span> (</span><i><span><span>nifH</span></span></i><span>), </span><span>n</span><span>itrifiers</span><span> (bacterial </span><i><span><span>amoA</span></span></i><span>), </span><span>n</span><span>itrate </span><span>r</span><span>educers</span><span> (</span><i><span><span>narG</span></span></i><span>) and d</span><span>enitrifiers</span><span> (</span><i><span><span>nirS</span></span></i><span>/</span><i><span><span>K</span></span></i><span> and </span><i><span><span>nosZ </span></span></i><span>genes).</span><span> Soil C:</span><span>N</span><span> ratio not only exhibited a negative relationship with the abundances of </span><span>P activators</span><span> (</span><i><span><span>phoD</span></span></i><span><span>,</span></span> <i><span><span>phoC</span></span></i><i> </i><span>and </span><i><span><span>pqqC</span></span></i><span> genes</span><span>)</span><span>, but also with </span><span>c</span><span>ellulolytic</span><span> decomposers</span><span> (</span><i><span><span>fungcbhIR</span></span></i><span> and </span><i><span><span>GH74</span></span></i> <span>genes)</span><span>. N</span><span>itrogen</span><span> cycling </span><span>genes, including bacterial </span><i><span><span>amoA</span></span></i><span>,</span><i><span><span> nirS</span></span></i><span>, </span><i><span><span>narG</span></span></i><span> and </span><i><span><span>norB</span></span></i><span>,</span> <span>exhibited</span><span> high</span><span>er</span><span> genetic resistance to </span><span>N deposition</span><span> compared with the </span><span>drying-wetting cycles</span><span> and </span><span>warming</span><span>. </span><span>Soil </span><span>total </span><span>C, N and P contents, and their ratios</span> <span>had</span><span> a </span><span>strong </span><span>direct effect on </span><span>the </span><span>genetic </span><span>resistance </span><span>of </span><span>microbial-groups</span><span>.</span><span> S</span><span>oil C:P ratio </span>was selected by random forest analyses as the main predictor of N cycling genetic resistance to <span>N deposition</span><span>. </span><span>Soil </span><span>total </span><span>C and N contents, and their ratios were </span>the main predictors of the <span>P cycling genetic resistance</span><span> to three global change drivers</span>. Overall, our work highlights the importance of soil stoichiometric balance for maintaining the ability of microbially-driven ecosystem functions to withstand global change.</span></p>
Soil carbon, nitrogen, and phosphorus cycling microbial populations and their resistance to global change depend on C:N:P stoichiometry
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