Microbial mediation of biogeochemical cycles revealed by simulation of global changes with soil transplant and cropping.

The ISME journal (2014-04-04)
Mengxin Zhao, Kai Xue, Feng Wang, Shanshan Liu, Shijie Bai, Bo Sun, Jizhong Zhou, Yunfeng Yang
RESUMEN

Despite microbes' key roles in driving biogeochemical cycles, the mechanism of microbe-mediated feedbacks to global changes remains elusive. Recently, soil transplant has been successfully established as a proxy to simulate climate changes, as the current trend of global warming coherently causes range shifts toward higher latitudes. Four years after southward soil transplant over large transects in China, we found that microbial functional diversity was increased, in addition to concurrent changes in microbial biomass, soil nutrient content and functional processes involved in the nitrogen cycle. However, soil transplant effects could be overridden by maize cropping, which was attributed to a negative interaction. Strikingly, abundances of nitrogen and carbon cycle genes were increased by these field experiments simulating global change, coinciding with higher soil nitrification potential and carbon dioxide (CO2) efflux. Further investigation revealed strong correlations between carbon cycle genes and CO2 efflux in bare soil but not cropped soil, and between nitrogen cycle genes and nitrification. These findings suggest that changes of soil carbon and nitrogen cycles by soil transplant and cropping were predictable by measuring microbial functional potentials, contributing to a better mechanistic understanding of these soil functional processes and suggesting a potential to incorporate microbial communities in greenhouse gas emission modeling.

MATERIALES
Referencia del producto
Marca
Descripción del producto

Sigma-Aldrich
Activated charcoal, DARCO®, −100 mesh particle size, powder
Supelco
Activated charcoal, powder
Sigma-Aldrich
Activated charcoal, powder, -100 particle size (mesh), decolorizing
Sigma-Aldrich
Activated charcoal, suitable for cell culture, suitable for plant cell culture
Sigma-Aldrich
Activated charcoal, DARCO®, 20-40 mesh particle size, granular
Supelco
Activated charcoal, puriss. p.a., powder
Sigma-Aldrich
Carbon, glassy, spherical powder, 2-12 μm, 99.95% trace metals basis
Sigma-Aldrich
Carbon, nanopowder, <100 nm particle size (TEM)
Sigma-Aldrich
Activated charcoal, untreated, granular, ≤5 mm
Sigma-Aldrich
Activated charcoal, DARCO®, 4-12 mesh particle size, granular
Sigma-Aldrich
Activated Charcoal Norit®, Norit® CA1, wood, chemically activated, powder
Sigma-Aldrich
Activated charcoal, untreated, granular, 8-20 mesh
Sigma-Aldrich
Activated charcoal, acid-washed with hydrochloric acid
Sigma-Aldrich
Activated charcoal, DARCO®, 12-20 mesh, granular
Sigma-Aldrich
Activated Charcoal Norit®, Norit® GAC 1240W, from coal, for potable water processing, steam activated, granular
Sigma-Aldrich
Activated Charcoal Norit®, Norit® SX2, powder, from peat, multi-purpose activated charcoal, steam activated and acid washed
Supelco
Activated Charcoal Norit®, Norit® RBAA-3, rod
Sigma-Aldrich
Activated Charcoal Norit®, Norit® PK 1-3, from peat, steam activated, granular
Supelco
Activated charcoal, for the determination of AOX, 50-150 μm particle size
Sigma-Aldrich
Activated Charcoal Norit®, Norit® RB3, for gas purification, steam activated, rod
Sigma-Aldrich
Activated Charcoal, meets USP testing specifications
Sigma-Aldrich
Activated charcoal, untreated, granular, 20-60 mesh
Carbon, foil, 100x100mm, thickness 0.5mm, flexible graphite, 99.8%
Supelco
Activated charcoal, suitable for GC
Carbon, foil, 5x5mm, thickness 2.0mm, hOpg
Carbon - Vitreous, foam, 150x150mm, thickness 2.5mm, bulk density 0.05g/cm3, porosity 96.5%
Carbon, foil, 10x10mm, thickness 2.0mm, hOpg
Carbon - Vitreous, foil, 25x25mm, thickness 0.5mm, glassy carbon
Carbon, foil, 100x100mm, thickness 0.35mm, flexible graphite, 99.8%
Carbon, tube, graphite, 50mm, outside diameter 12.7mm, inside diameter 9.5mm, wall thickness 1.6mm, 99.95%