Deficit irrigation drives maize root distribution and soil microbial communities with implications for soil carbon dynamics

2020 ◽  
Author(s):  
Nora E. Flynn ◽  
Catherine E. Stewart ◽  
Louise H. Comas ◽  
Steven J. Fonte
Keyword(s):  
Microbial Communities ◽  
Soil Carbon ◽  
Root Distribution ◽  
Deficit Irrigation ◽  
Soil Microbial Communities ◽  
Carbon Dynamics ◽  
Maize Root ◽  
Soil Carbon Dynamics ◽  
Soil Microbial

scholarly journals Long-Term Warming Alters Carbohydrate Degradation Potential in Temperate Forest Soils

2016 ◽  
Vol 82 (22) ◽  
pp. 6518-6530 ◽  
Author(s):  
Grace Pold ◽  
Andrew F. Billings ◽  
Jeff L. Blanchard ◽  
Daniel B. Burkhardt ◽  
Serita D. Frey ◽  
...  
Keyword(s):  
Climate Change ◽  
Microbial Communities ◽  
Soil Carbon ◽  
Carbon Cycling ◽  
Temperate Forest ◽  
Mineral Soil ◽  
Soil Microbial Communities ◽  
Organic Horizon ◽  
Soil Microbial ◽  
Carbohydrate Degradation

ABSTRACTAs Earth's climate warms, soil carbon pools and the microbial communities that process them may change, altering the way in which carbon is recycled in soil. In this study, we used a combination of metagenomics and bacterial cultivation to evaluate the hypothesis that experimentally raising soil temperatures by 5°C for 5, 8, or 20 years increased the potential for temperate forest soil microbial communities to degrade carbohydrates. Warming decreased the proportion of carbohydrate-degrading genes in the organic horizon derived from eukaryotes and increased the fraction of genes in the mineral soil associated withActinobacteriain all studies. Genes associated with carbohydrate degradation increased in the organic horizon after 5 years of warming but had decreased in the organic horizon after warming the soil continuously for 20 years. However, a greater proportion of the 295 bacteria from 6 phyla (10 classes, 14 orders, and 34 families) isolated from heated plots in the 20-year experiment were able to depolymerize cellulose and xylan than bacterial isolates from control soils. Together, these findings indicate that the enrichment of bacteria capable of degrading carbohydrates could be important for accelerated carbon cycling in a warmer world.IMPORTANCEThe massive carbon stocks currently held in soils have been built up over millennia, and while numerous lines of evidence indicate that climate change will accelerate the processing of this carbon, it is unclear whether the genetic repertoire of the microbes responsible for this elevated activity will also change. In this study, we showed that bacteria isolated from plots subject to 20 years of 5°C of warming were more likely to depolymerize the plant polymers xylan and cellulose, but that carbohydrate degradation capacity is not uniformly enriched by warming treatment in the metagenomes of soil microbial communities. This study illustrates the utility of combining culture-dependent and culture-independent surveys of microbial communities to improve our understanding of the role changing microbial communities may play in soil carbon cycling under climate change.

scholarly journals Effects of arbuscular mycorrhizae on tomato yield, nutrient uptake, water relations, and soil carbon dynamics under deficit irrigation in field conditions

2016 ◽  
Vol 566-567 ◽  
pp. 1223-1234 ◽  
Author(s):  
Timothy M. Bowles ◽  
Felipe H. Barrios-Masias ◽  
Eli A. Carlisle ◽  
Timothy R. Cavagnaro ◽  
Louise E. Jackson
Keyword(s):  
Soil Carbon ◽  
Nutrient Uptake ◽  
Water Relations ◽  
Deficit Irrigation ◽  
Arbuscular Mycorrhizae ◽  
Carbon Dynamics ◽  
Field Conditions ◽  
Soil Carbon Dynamics ◽  
Tomato Yield

scholarly journals Does the chemical nature of soil carbon drive the structure and functioning of soil microbial communities?

2014 ◽  
Vol 70 ◽  
pp. 54-61 ◽  
Author(s):  
E.-L. Ng ◽  
A.F. Patti ◽  
M.T. Rose ◽  
C.R. Schefe ◽  
K. Wilkinson ◽  
...  
Keyword(s):  
Microbial Communities ◽  
Soil Carbon ◽  
Chemical Nature ◽  
Soil Microbial Communities ◽  
Soil Microbial
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