Influence of soil-water content on CO2
 efflux within the elevation transect heavily impacted by erosion

AbstractThe aim of the study was to describe the impact of the soil water content and sulfamethoxazole, SUL, (antibiotic) concentration in soil on the net CO2 efflux. Soil samples were taken from topsoils of a Haplic Fluvisol and Haplic Chernozem. Soil samples were packed into the steel cylinders. The net CO2 efflux was measured from these soil columns after application of fresh water or SUL solution at different soil water contents. The experiments were carried out in dark at 20°C. The trends in the net CO2 efflux varied for different treatments. While initially high values for water treatment exponentially decreased in time, values for solution treatment increased during the first 250–650 minutes and then decreased. The total net CO2 effluxes measured for 20 hours related to the soil water content followed the second order polynomial functions. The maximal values were measured for the soil water content of 0.15 cm3 cm−3 (Haplic Fluvisol with water or solution, Haplic Chernozem with solution) and 0.11 cm3 cm−3 (Haplic Chernozem with water). The ratios between values measured for solution and water at the same soil water contents exponentially increased with increasing SUL concentration in soils. This proved the increasing stimulative influence of SUL on soil microbial activity.

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Soil CO2 efflux in a beech forest: dependence on soil temperature and soil water content

Annales des Sciences Forestières ◽

10.1051/forest:19990304 ◽

1999 ◽

Vol 56 (3) ◽

pp. 221-226 ◽

Cited By ~ 146

Author(s):

Daniel Epron ◽

Lætitia Farque ◽

Éric Lucot ◽

Pierre-Marie Badot

Keyword(s):

Soil Temperature ◽

Water Content ◽

Soil Water ◽

Soil Water Content ◽

Beech Forest ◽

Soil Co2 Efflux ◽

Co2 Efflux ◽

Soil Co2 ◽

Forest Dependence

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Cropping Sequence Influenced Crop Yield, Soil Water Content, Residue Return, and CO2 Efflux in Wheat-Camelina Cropping System

Kansas Agricultural Experiment Station Research Reports ◽

10.4148/2378-5977.7429 ◽

2017 ◽

Vol 3 (6) ◽

Author(s):

E. Obeng ◽

A. Obour ◽

N. O. Nelson ◽

I. A. Ciampitti ◽

Donghai Wang ◽

...

Keyword(s):

Water Content ◽

Soil Water ◽

Soil Water Content ◽

Crop Yield ◽

Cropping System ◽

Co2 Efflux ◽

Cropping Sequence

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Soil carbon dioxide efflux determined from large undisturbed soil cores collected in different soil management systems

Biologia ◽

10.2478/s11756-009-0111-x ◽

2009 ◽

Vol 64 (3) ◽

Cited By ~ 2

Author(s):

Eszter Tóth ◽

Sándor Koós ◽

Csilla Farkas

Keyword(s):

Water Content ◽

Soil Water ◽

Soil Water Content ◽

Soil Management ◽

Measuring Method ◽

Soil Co2 Efflux ◽

Management Systems ◽

Co2 Efflux ◽

Soil Co2 ◽

Undisturbed Soil

AbstractThe aim of this study was to evaluate a measuring technique for determining soil CO2 efflux from large soil samples having undisturbed structure under controlled laboratory conditions. Further objectives were to use the developed measuring method for comparing soil CO2 efflux from samples, collected in three different soil management systems at various soil water content values. The experimental technique was tested and optimised for timing of sampling by taking air samples after 1, 3 and 6 hours of incubation. Based on the results, the incubation time was set to three hours. The CO2 efflux measured for different soil management systems was the highest in the no-till and the lowest in the ploughing treatment, which was in accordance with measurements on accessible organic carbon for microbes. An increase in CO2 efflux with increasing soil water content was found in the studied soil water content range. Our results indicate that soil respiration rates, measured directly after tillage operations, can highly differ from those measured long after.

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Soil CO<sub>2</sub> efflux in an old-growth southern conifer forests (<i>Agathis australis</i>) – magnitude, components, and controls

10.5194/soil-2016-21 ◽

2016 ◽

Author(s):

Luitgard Schwendenmann ◽

Cate Macinnis-Ng

Keyword(s):

Regression Analysis ◽

Soil Temperature ◽

Water Content ◽

Soil Water ◽

Soil Water Content ◽

Root Biomass ◽

Soil Co2 Efflux ◽

Co2 Efflux ◽

Soil Co2 ◽

Total Soil

Abstract. Total soil CO2 efflux and its component fluxes, autotrophic and heterotrophic respiration, were measured in a native forest in northern Aotearoa-New Zealand. The forest is dominated by Agathis australis (kauri) and is on an acidic, clay rich soil. Soil CO2 efflux, volumentric soil water content and soil temperature were measured bi-weekly to monthly at 42 locations over 18 months. Trenching and regression analysis was used to partition the total soil CO2 efflux. The effect of tree structure was investigated by calculating an index of local contribution (Ic, based on tree size and distance to the measurement location) followed by correlation analysis between Ic and soil CO2 efflux, root biomass, litterfall and soil characteristics. The mean total soil CO2 efflux was 3.47 μmol m−2 s−1. Using uni- and bivariate models showed that soil temperature (< 40 %) and volumetric soil water content (< 20 %) were poor predictors of the temporal variation in total soil CO2 efflux. In contrast, a stronger temperature sensitivity (around 57 %) was found for heterotrophic respiration. Autotrophic respiration accounted for 25 (trenching) or 28 % (regression analysis) of total soil CO2 efflux. We found significant positive relationships between kauri tree size distribution (Ic) and soil CO2 efflux, root biomass and mineral soil CN ratio within 5–6 m of the measurement points. Using multiple regression analysis revealed that 97 % of the spatial variability in soil CO2 efflux in this kauri dominated stand was explained by root biomass and soil temperature. Our findings highlight the need to consider tree species effects and spatial patterns in soil carbon related studies.

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SOIL WATER CONTENT AFFECTS THE AVAILABILITY OF PHOSPHATE

Proceedings of the New Zealand Grassland Association ◽

10.33584/jnzg.1985.46.1696 ◽

1985 ◽

pp. 185-189

Author(s):

M.C.H.Mouat Pieter Nes

Keyword(s):

Water Content ◽

Soil Water ◽

Soil Water Content ◽

Soil Solution ◽

Equivalent Reduction

Reduction in water content of a soil increased the concentration of ammonium and nitrate in solution, but had no effect on the concentration of phosphate. The corresponding reduction in the quantity of phosphate in solution caused an equivalent reduction in the response of ryegrass to applied phosphate. Keywords: soil solution, soil water content, phosphate, ryegrass, nutrition.

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Effect of inter-row cultivation on soil carbon dioxide emission in a peach plantation

Agrokémia és Talajtan ◽

10.1556/agrokem.59.2010.1.19 ◽

2010 ◽

Vol 59 (1) ◽

pp. 157-164 ◽

Cited By ~ 1

Author(s):

E. Tóth ◽

Cs. Farkas

Keyword(s):

Water Content ◽

Soil Water ◽

Soil Water Content ◽

Carbon Dioxide Emission ◽

Nutrient Content ◽

Soil Disturbance ◽

Biological Properties ◽

Soil Tillage ◽

Favourable Effect ◽

Volumetric Soil Water Content

Soil biological properties and CO2emission were compared in undisturbed grass and regularly disked rows of a peach plantation. Higher nutrient content and biological activity were found in the undisturbed, grass-covered rows. Significantly higher CO2fluxes were measured in this treatment at almost all the measurement times, in all the soil water content ranges, except the one in which the volumetric soil water content was higher than 45%. The obtained results indicated that in addition to the favourable effect of soil tillage on soil aeration, regular soil disturbance reduces soil microbial activity and soil CO2emission.

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