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1. Natural organic matter composition and nanomaterial surface coating determine the nature of platinum nanomaterial-natural organic matter corona

   https://doi.org/https://doi.org/10.1016/j.scitotenv.2021.150477  

   Mohammed Baalousha, Mithun Sikder ( January 2022 , Science of the total environment)
2. Pore architecture and particulate organic matter in soils under monoculture switchgrass and restored prairie in contrasting topography

   https://doi.org/10.1038/s41598-021-01533-7  

   Juyal, Archana ; Guber, Andrey ; Oerther, Maxwell ; Quigley, Michelle ; Kravchenko, Alexandra ( December 2021 , Scientific Reports)

   Abstract Bioenergy cropping systems can substantially contribute to climate change mitigation. However, limited information is available on how they affect soil characteristics, including pores and particulate organic matter (POM), both essential components of the soil C cycle. The objective of this study was to determine effects of bioenergy systems and field topography on soil pore characteristics, POM, and POM decomposition under new plant growth. We collected intact soil cores from two systems: monoculture switchgrass ( Panicum virgatum L.) and native prairie, at two contrasting topographical positions (depressions and slopes), planting half of the cores with switchgrass. Pore and POM characteristicsmore »were obtained using X-ray computed micro-tomography (μCT) (18.2 µm resolution) before and after new switchgrass growth. Diverse prairie vegetation led to higher soil C than switchgrass, with concomitantly higher volumes of 30–90 μm radius pores and greater solid-pore interface. Yet, that effect was present only in the coarse-textured soils on slopes and coincided with higher root biomass of prairie vegetation. Surprisingly, new switchgrass growth did not intensify decomposition of POM, but even somewhat decreased it in monoculture switchgrass as compared to non-planted controls. Our results suggest that topography can play a substantial role in regulating factors driving C sequestration in bioenergy systems.« less
3. Long-term trends and synchrony in dissolved organic matter characteristics in Wisconsin, USA, lakes: Quality, not quantity, is highly sensitive to climate: TRENDS IN DOM CHARACTERISTICS

   https://doi.org/10.1002/2016JG003630  

   Jane, Stephen F. ; Winslow, Luke A. ; Remucal, Christina K. ; Rose, Kevin C. ( March 2017 , Journal of Geophysical Research: Biogeosciences)
4. Elevated p CO ₂ alters marine heterotrophic bacterial community composition and metabolic potential in response to a pulse of phytoplankton organic matter: Elevated pCO ₂ alters marine heterotrophic bacterial community composition and metabolic potential

   https://doi.org/10.1111/1462-2920.14484  

   James, Anna K. ; Kelly, Linda W. ; Nelson, Craig E. ; Wilbanks, Elizabeth G. ; Carlson, Craig A. ( February 2019 , Environmental Microbiology)
5. Sinking flux of particulate organic matter in the oceans: Sensitivity to particle characteristics

   https://doi.org/10.1038/s41598-020-60424-5  

   Omand, Melissa M. ; Govindarajan, Rama ; He, Jing ; Mahadevan, Amala ( March 2020 , Scientific Reports)

   The sinking of organic particles produced in the upper sunlit layers of the ocean forms an important limb of the oceanic biological pump, which impacts the sequestration of carbon and resupply of nutrients in the mesopelagic ocean. Particles raining out from the upper ocean undergo remineralization by bacteria colonized on their surface and interior, leading to an attenuation in the sinking flux of organic matter with depth. Here, we formulate a mechanistic model for the depth-dependent, sinking, particulate mass flux constituted by a range of sinking, remineralizing particles. Like previous studies, we find that the model does not achievemore »the characteristic ‘Martin curve’ flux profile with a single type of particle, but instead requires a distribution of particle sizes and/or properties. We consider various functional forms of remineralization appropriate for solid/compact particles, and aggregates with an anoxic or oxic interior. We explore the sensitivity of the shape of the flux vs. depth profile to the choice of remineralization function, relative particle density, particle size distribution, and water column density stratification, and find that neither a power-law nor exponential function provides a definitively superior fit to the modeled profiles. The profiles are also sensitive to the time history of the particle source. Varying surface particle size distribution (via the slope of the particle number spectrum) over 3 days to represent a transient phytoplankton bloom results in transient subsurface maxima or pulses in the sinking mass flux. This work contributes to a growing body of mechanistic export flux models that offer scope to incorporate underlying dynamical and biological processes into global carbon cycle models.

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