Reduction of soil carbon formation by tropospheric ozone under increased carbon dioxide levels

Nature ◽  
2003 ◽  
Vol 425 (6959) ◽  
pp. 705-707 ◽  
Author(s):  
Wendy M. Loya ◽  
Kurt S. Pregitzer ◽  
Noah J. Karberg ◽  
John S. King ◽  
Christian P. Giardina
Keyword(s):  
Carbon Dioxide ◽  
Soil Carbon ◽  
Tropospheric Ozone ◽  
Carbon Formation ◽  
Soil Carbon Formation ◽  
Carbon Dioxide Levels

How drought modulates carbon-use efficiency and soil carbon formation in rhizosphere, detritusphere, and bulk soils

2020 ◽  
Author(s):  
Noah Sokol ◽  
Steve Blazewicz ◽  
Megan Foley ◽  
Alex Greenlon ◽  
Jennifer Pett-Ridge
Keyword(s):  
Soil Moisture ◽  
Soil Carbon ◽  
Soil Microbial Communities ◽  
Bulk Soil ◽  
Carbon Pools ◽  
Carbon Formation ◽  
Soil Microbial ◽  
Carbon Use Efficiency ◽  
Use Efficiency ◽  
Soil Carbon Formation

<p>Carbon use efficiency (CUE) is theorized to be positively associated with the formation of microbially-derived, mineral-associated soil carbon.  Yet few empirical studies have directly tested this relationship. Moreover, it is unclear: (1) how differences between distinct soil microbial communities (for example, differences in competitive interactions and/or growth rate among rhizosphere, detritusphere, and bulk soil communities) may yield different relationships between carbon-use efficiency and soil carbon formation, and (2) how microbial ecophysiology – such as physiological changes induced by drought – may modulate the strength and/or direction of the CUE-soil carbon relationship.</p><p>To investigate these questions, we conducted a 12-week <sup>13</sup>C tracer study to track the movement of two dominant sources of plant carbon – rhizodeposition and root detritus – into soil microbial communities and carbon pools under normal moisture vs drought conditions. Using a continuous <sup>13</sup>CO<sub>2</sub>-labeling system, we grew the Mediterranean annual grass <em>Avena barbata</em> in controlled growth chambers and measured the formation of organic matter from <sup>13</sup>C-enriched rhizodeposition. As the plants grew, we harvested rhizosphere and bulk soil at three time points (4, 8, and 12 weeks) to capture changes in soil carbon pools and microbial community dynamics. In parallel microcosms, we tracked the formation of soil carbon derived from <sup>13</sup>C-enriched <em>A. barbata</em> root detritus during 12 weeks of decomposition; harvesting detritusphere and bulk soil at 4,8, and 12 weeks. In all microcosms, we manipulated soil moisture to generate drought (7.8 ± 2.1 % soil moisture) and ‘normal moisture’ (15.1 ± 4.2 % soil moisture) treatments.</p><p>In all samples (over 150 observations), we measured CUE via the <sup>18</sup>O-H<sub>2</sub>O method, and quantified the formation of different <sup>13</sup>C-soil organic carbon pools via density fractionation. Here we will present data on how soil moisture influences CUE in rhizosphere, detritusphere, and bulk soil communities, and whether differences in CUE are correlated with the formation of mineral-associated soil organic carbon. These results will help to illustrate whether CUE acts as a lynchpin variable with predictive power for stable soil carbon formation, or whether other microbial traits may require consideration.</p><p> </p><p> </p>

Empirical evidence that soil carbon formation from plant inputs is positively related to microbial growth

2013 ◽  
Vol 113 (1-3) ◽  
pp. 271-281 ◽  
Author(s):  
Mark A. Bradford ◽  
Ashley D. Keiser ◽  
Christian A. Davies ◽  
Calley A. Mersmann ◽  
Michael S. Strickland
Keyword(s):  
Soil Carbon ◽  
Empirical Evidence ◽  
Microbial Growth ◽  
Carbon Formation ◽  
Soil Carbon Formation

scholarly journals Plant growth, biomass partitioning and soil carbon formation in response to altered lignin biosynthesis inPopulus tremuloides

2007 ◽  
Vol 173 (4) ◽  
pp. 732-742 ◽  
Author(s):  
Jessica E. Hancock ◽  
Wendy M. Loya ◽  
Christian P. Giardina ◽  
Laigeng Li ◽  
Vincent L. Chiang ◽  
...  
Keyword(s):  
Plant Growth ◽  
Soil Carbon ◽  
Lignin Biosynthesis ◽  
Biomass Partitioning ◽  
Carbon Formation ◽  
Soil Carbon Formation

Substrate identity and amount overwhelm temperature effects on soil carbon formation

2018 ◽  
Vol 124 ◽  
pp. 218-226 ◽  
Author(s):  
Emily E. Oldfield ◽  
Thomas W. Crowther ◽  
Mark A. Bradford
Keyword(s):  
Soil Carbon ◽  
Temperature Effects ◽  
Carbon Formation ◽  
Soil Carbon Formation
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