Qing Zheng

Qing Zheng
Lawrence Berkeley National Laboratory | LBL · Environmental Genomics and Systems Biology

PhD

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16
Publications
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464
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Publications

Publications (16)
Preprint
Soil fertility and plant productivity are globally constrained by N availability. Proteins are the largest N reservoir in soils and the cleavage of proteins into small peptides and amino acids has been shown to be the rate limiting step in the terrestrial N cycle. However, we are still lacking a profound understanding of the environmental controls...
Article
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Soil organic matter (SOM) is the dominant reservoir of terrestrial organic carbon and nitrogen, and microbial necromass represents a primary input to it. However, knowledge of stabilization mechanisms and direct measurements of the decomposition of microbial-derived SOM are lacking. Here we report a novel ¹⁵N isotope pool dilution approach using la...
Article
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Microorganisms are critical in mediating carbon (C) and nitrogen (N) cycling processes in soils. Yet, it has long been debated whether the processes underlying biogeochemical cycles are affected by the composition and diversity of the soil microbial community or not. The composition and diversity of soil microbial communities can be influenced by v...
Article
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Microbial nitrogen use efficiency (NUE) is the efficiency by which microbes allocate organic N acquired to biomass formation relative to the N in excess of microbial demand released through N mineralization. Microbial NUE thus is critical to estimate the capacity of soil microbes to retain N in soils and thereby affects inorganic N availability to...
Article
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Proteins constitute the single largest soil organic nitrogen (SON) reservoir and its decomposition drives terrestrial N availability. Protein cleavage by extracellular enzymes is the rate limiting step in the soil organic N cycle and can be controlled by extracellular enzyme production or protein availability/stabilization in soil. Both controls ca...
Article
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Plant roots release recent photosynthates into the rhizosphere, accelerating decomposition of organic matter by saprotrophic soil microbes ("rhizosphere priming effect") which consequently increases nutrient availability for plants. However, about 90% of all higher plant species are mycorrhizal, transferring a significant fraction of their photosyn...
Article
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The ratio of carbon (C) that is invested into microbial growth to organic C taken up is known as microbial carbon use efficiency (CUE), which is influenced by environmental factors such as soil temperature and soil moisture. How microbes will physiologically react to short-term environmental changes is not well understood, primarily due to methodol...
Article
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Amino sugars and D-amino acid enantiomers are major components of bacterial and fungal cell walls (i.e. peptidoglycan and chitin) and are often used as biomarkers of microbial residue turnover in soils. However, little is known about the in situ decomposition rates of microbial cell wall residues and how soil physicochemical properties affect this...
Article
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Soil fluxomics analysis can provide pivotal information for understanding diverse soil biochemical pathways and their regulation, but direct measurement methods are very rare. In this work, we describe an approach to measure soil extracellular metabolite (amino sugar and amino acid) fluxes based on the ¹⁵N isotope pool dilution technique via liquid...
Poster
ncreasing N deposition, land use change, elevated atmospheric CO2 concentrations and global warming have altered soil nitrogen (N) cycling during the last decades. Those changes affected ecosystem services, such as C and N sequestration in soils, which calls for a better understanding of soil N transformation processes. The cleavage of macromolecul...

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