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- George, T. S., et al.
(författare)
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Organic phosphorus in the terrestrial environment : a perspective on the state of the art and future priorities
- 2018
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Ingår i: Plant and Soil. - : Springer Netherlands. - 0032-079X .- 1573-5036. ; 427:1-2, s. 191-208
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Tidskriftsartikel (refereegranskat)abstract
- Background: The dynamics of phosphorus (P) in the environment is important for regulating nutrient cycles in natural and managed ecosystems and an integral part in assessing biological resilience against environmental change. Organic P (P-o) compounds play key roles in biological and ecosystems function in the terrestrial environment being critical to cell function, growth and reproduction.Scope: We asked a group of experts to consider the global issues associated with P-o in the terrestrial environment, methodological strengths and weaknesses, benefits to be gained from understanding the P-o cycle, and to set priorities for P-o research.Conclusions: We identified seven key opportunities for P-o research including: the need for integrated, quality controlled and functionally based methodologies; assessment of stoichiometry with other elements in organic matter; understanding the dynamics of P-o in natural and managed systems; the role of microorganisms in controlling P-o cycles; the implications of nanoparticles in the environment and the need for better modelling and communication of the research. Each priority is discussed and a statement of intent for the P-o research community is made that highlights there are key contributions to be made toward understanding biogeochemical cycles, dynamics and function of natural ecosystems and the management of agricultural systems.
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| 2. |
- Leizeaga, Ainara, et al.
(författare)
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Using a tropical elevation gradient to evaluate the impact of land‐use intensity and forest restoration on the microbial use of organic matter under climate change
- 2022
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Ingår i: Global Biogeochemical Cycles. - 0886-6236. ; 36:4
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Tidskriftsartikel (refereegranskat)abstract
- We investigated how legacies of land use and climate affected the microbial use of organic matter (OM) along a tropical climate gradient in Ethiopia. Four levels of land-use intensity ranging from croplands to pristine forests were assessed along a gradient from cool and moist high altitude (MAT = 16°C, MAP = 2,200 mm) to hot and dry lowland sites (MAT = 20°C, MAP = 1,050 mm). We resolved the biomass, structure, and growth rates of microbial decomposer communities together with the rates of carbon (C) and nitrogen (N) transformation. To target the legacies of climate and land use, samples were assessed at optimal moisture and standardized temperature in the laboratory. Microbial biomass and the fungal-to-bacterial ratio increased with both legacies of drier climates and higher land-use intensities. In contrast, fungal growth rates increased in humid climates, but were unaffected by land use. The ratio of C mineralization to gross N mineralization decreased with higher humidity and more intensive land use, suggesting a change in microbial resource use from more nutrient-poor to nutrient-rich OM. Mineralization of nutrient-poor OM implied a lower nutrient availability to microbes in arid climates and low-intensity land uses, while the mineralization of nutrient-rich OM in humid sites and higher intensity land uses implied a higher microbial nutrient availability there. The difference in respiration between land uses increased with ecosystem aridity, suggesting that OM turnover and soil fertility were more impacted by land use in drier climates. Together, our results suggest that drier subtropical climates will exacerbate the negative effects of land-use intensification on OM turnover and nutrient provisioning for plants.
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