Effects of soil salinity and carbon availability from organic amendments on nitrous oxide emissions

Reddy, Namratha; Crohn, David M.

doi:10.1016/j.geoderma.2014.07.022

Cited by 60 publications

(33 citation statements)

References 42 publications

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Section: Discussionmentioning

confidence: 99%

“…There are several possible explanations for the increase in soil N 2 O emissions with increasing soil salinity. First, higher soil salinity can directly inhibit the last step of the denitrification chain of specific denitrifiers, including the reduction of N 2 O to N 2 , which is likely because osmotic stress induced by salinization can suppress the denitrifiers responsible for reducing N 2 O to N 2 (Reddy & Crohn, 2014). Similarly, Marton et al (2012) found that soil N 2 O emissions positively responded to elevated salinity in a tidal freshwater wetland of the Satilla River delta in southern Georgia (USA) because the enzyme N 2 O reductase was inhibited at higher salinity levels, which resulted in greater N 2 O emissions.…”

Section: N Lossmentioning

confidence: 99%

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A meta‐analysis of soil salinization effects on nitrogen pools, cycles and fluxes in coastal ecosystems

Zhou

Butterbach‐Bahl

Vereecken

et al. 2016

Global Change Biology

172

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Salinity intrusion caused by land subsidence resulting from increasing groundwater abstraction, decreasing river sediment loads and increasing sea level because of climate change has caused widespread soil salinization in coastal ecosystems. Soil salinization may greatly alter nitrogen (N) cycling in coastal ecosystems. However, a comprehensive understanding of the effects of soil salinization on ecosystem N pools, cycling processes and fluxes is not available for coastal ecosystems. Therefore, we compiled data from 551 observations from 21 peer-reviewed papers and conducted a meta-analysis of experimental soil salinization effects on 19 variables related to N pools, cycling processes and fluxes in coastal ecosystems. Our results showed that the effects of soil salinization varied across different ecosystem types and salinity levels. Soil salinization increased plant N content (18%), soil NH (12%) and soil total N (210%), although it decreased soil NO (2%) and soil microbial biomass N (74%). Increasing soil salinity stimulated soil N O fluxes as well as hydrological NH and NO fluxes more than threefold, although it decreased the hydrological dissolved organic nitrogen (DON) flux (59%). Soil salinization also increased the net N mineralization by 70%, although salinization effects were not observed on the net nitrification, denitrification and dissimilatory nitrate reduction to ammonium in this meta-analysis. Overall, this meta-analysis improves our understanding of the responses of ecosystem N cycling to soil salinization, identifies knowledge gaps and highlights the urgent need for studies on the effects of soil salinization on coastal agro-ecosystem and microbial N immobilization. Additional increases in knowledge are critical for designing sustainable adaptation measures to the predicted intrusion of salinity intrusion so that the productivity of coastal agro-ecosystems can be maintained or improved and the N losses and pollution of the natural environment can be minimized.

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Section: Discussionmentioning

confidence: 99%

Section: N Lossmentioning

confidence: 99%

A meta‐analysis of soil salinization effects on nitrogen pools, cycles and fluxes in coastal ecosystems

Zhou

Butterbach‐Bahl

Vereecken

et al. 2016

Global Change Biology

172

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“…Moisture contents were regularly monitored and maintained gravimetrically in all jars at 60% Water Filled Pore Space (WFPS). Gravimetric mass of water required to achieve a desired WFPS for soils packed at a known bulk density was calculated using the equation given by Reddy and Crohn (2014). Sterile water was used to adjust moisture in jars that contained pre-sterilized soil and amendment mixtures in order to maintain the sterile conditions all along the incubation.…”

Section: Soil Treatments and Incubationmentioning

confidence: 99%

Evaluating the relative contribution of physiochemical and biological factors in ameliorating a saline–sodic soil amended with composts and biochar and leached with reclaimed water

2015

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“…Elevated CO 2 emissions were also expected from the Gatton horticulture soil treated with raw feedlot manure, as other studies have shown increased CO 2 flux following the addition of organic amendments to soil (Reddy & Crohn 2014;Yang et al 2014). Emissions were also higher in the Gatton soil treated with composted chicken manure as compared to the control, and peak CO 2 emissions for all 3 treatments were under saturated soil conditions.…”

Section: Cosupporting

confidence: 53%

Soil active carbon as an indicator of nitrous oxide loss potential

McIntosh¹

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Improving nitrogen use efficiency in agriculture is crucial to mitigating the greenhouse gas emissions caused by the use of fertilisers whilst increasing production to support the needs of a growing population. Understanding nutrient cycling in agricultural soils informs better land management strategies to achieve these aims. To date, the measurement of key soil properties and estimation of process rates such as nitrogen mineralisation has involved a high cost of labour, equipment and laboratory analysis. A gap exists for simple methods which can be used in the field to quickly assess vital indicators of soil quality and processes.This study tested the viability of a field kit to measure the active or labile soil carbon fraction as permanganate oxidisable carbon and determine its relationship to key soil processes, including denitrification. Fifteen agricultural soils contrasted by land use history and management were incubated in the laboratory at three different water levels, with and without the addition of potassium nitrate, for 100 days.Carbon dioxide and nitrous oxide gas fluxes were calculated at eight intervals over the 100 days. Active carbon and mineral nitrogen availability was determined at days 0, 28 and 100. Resistant C and N were measured from the same composite samples using sodium hypochlorite to enable the fractionation of recalcitrant pools. iv

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Effects of soil salinity and carbon availability from organic amendments on nitrous oxide emissions

Cited by 60 publications

References 42 publications

A meta‐analysis of soil salinization effects on nitrogen pools, cycles and fluxes in coastal ecosystems

A meta‐analysis of soil salinization effects on nitrogen pools, cycles and fluxes in coastal ecosystems

Evaluating the relative contribution of physiochemical and biological factors in ameliorating a saline–sodic soil amended with composts and biochar and leached with reclaimed water

Soil active carbon as an indicator of nitrous oxide loss potential

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