2012 journal article
Relationships Between Nitrogen Transformation Rates and Gene Abundance in a Riparian Buffer Soil
ENVIRONMENTAL MANAGEMENT, 50(5), 861–874.
author keywords: Riparian buffer; Nitrogen; Denitrification; Quantitative PCR; Nitrous oxide; Nitrate
MeSH headings : Denitrification; Nitrates / analysis; Nitrates / metabolism; Nitrogen / analysis; Nitrogen / metabolism; Nitrous Oxide / analysis; Nitrous Oxide / metabolism; Polymerase Chain Reaction; Soil / analysis
TL;DR:
The results suggest that low-molecular mass organic species are more effective at promoting nitrogen transformations than large biopolymers or humic substances, and also help to link genetic potential to chemical reactivity.
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UN Sustainable Development Goal Categories
2. Zero Hunger
(OpenAlex)
6. Clean Water and Sanitation
(Web of Science)
Source: Web Of Science
Added: August 6, 2018
Denitrification is a critical biogeochemical process that results in the conversion of nitrate to volatile products, and thus is a major route of nitrogen loss from terrestrial environments. Riparian buffers are an important management tool that is widely utilized to protect water from non-point source pollution. However, riparian buffers vary in their nitrate removal effectiveness, and thus there is a need for mechanistic studies to explore nitrate dynamics in buffer soils. The objectives of this study were to examine the influence of specific types of soluble organic matter on nitrate loss and nitrous oxide production rates, and to elucidate the relationships between these rates and the abundances of functional genes in a riparian buffer soil. Continuous-flow soil column experiments were performed to investigate the effect of three types of soluble organic matter (citric acid, alginic acid, and Suwannee River dissolved organic carbon) on rates of nitrate loss and nitrous oxide production. We found that nitrate loss rates increased as citric acid concentrations increased; however, rates of nitrate loss were weakly affected or not affected by the addition of the other types of organic matter. In all experiments, rates of nitrous oxide production mirrored nitrate loss rates. In addition, quantitative polymerase chain reaction (qPCR) was utilized to quantify the number of genes known to encode enzymes that catalyze nitrite reduction (i.e., nirS and nirK) in soil that was collected at the conclusion of column experiments. Nitrate loss and nitrous oxide production rates trended with copy numbers of both nir and 16s rDNA genes. The results suggest that low-molecular mass organic species are more effective at promoting nitrogen transformations than large biopolymers or humic substances, and also help to link genetic potential to chemical reactivity.