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Greenhouse gas emissions from cultivated organic soils

effect of cropping system, soil type and drainage

Norberg, Lisbet (2017). Greenhouse gas emissions from cultivated organic soils. Diss. (sammanfattning/summary) Uppsala : Sveriges lantbruksuniv., Acta Universitatis agriculturae Sueciae, 1652-6880 ; 2017:30
ISBN 978-91-576-8833-0
eISBN 978-91-576-8834-7
[Doctoral thesis]

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Abstract

Pristine peatlands are accumulators of organic material and large stores of carbon. During the past two centuries, large peatland areas in Sweden have been drained for agricultural purposes. Drainage of peatlands leads to an increase in soil carbon and nitrogen turnover rate, accompanied by release of the greenhouse gases (GHG), carbon dioxide (CO2) and nitrous oxide (N2O). Fluxes of methane (CH4) also change following drainage. Therefore, on-farm management and mitigation strategies are important.

This thesis investigated whether choice of cropping system (grassland, cereals or row crops) can be used as a mitigation option for GHG emissions, whether differences in soil properties can explain emissions of GHG, how changes in drainage intensity influence CO2 emissions and whether different peat soil types respond differently to drainage. Effects of different cropping systems were studied by on-site measurements of GHG emissions from soil under two different crops grown adjacent to each other, and hence with the same soil type, drainage intensity and environmental conditions. The study was performed on 11 different sites representing different types of organic soils. The influence of drainage and chemical and physical soil properties was investigated in a laboratory study where 13 different organic soils were drained to different soil water suctions (near water-saturated to 1.5 m water column) and emissions of CO2 were measured at each suction step.

The results show that no specific cropping system can be recommended as a better option for limiting GHG emissions from cultivated organic soils. The cropping system did not influence the fluxes of N2O and CH4, while the differences regarding carbon dioxide emissions were not conclusive. The laboratory soil samples represented a wide range of soil properties, but none of the measured properties was correlated with CO2 emissions. When peat soils were drained to 0.5 m water column, CO2 production was already at its highest level, so increasing the drainage intensity (to 0.75 or 1 m water column) did not result in higher CO2 emissions. The variations in GHG emissions were large between sites, within sites and over time. Soil properties, e.g. pH and carbon content, varied widely between soils. The peat soils studied responded differently to drainage, as was evident from the shape of the emissions-drainage curves.

Authors/Creators:Norberg, Lisbet
Title:Greenhouse gas emissions from cultivated organic soils
Subtitle:effect of cropping system, soil type and drainage
Series/Journal:Acta Universitatis agriculturae Sueciae (1652-6880)
Year of publishing :2017
Depositing date:27 April 2017
Volume:2017:30
Number of Pages:62
Papers/manuscripts:
NumberReferences
INorberg, L., Berglund, Ö. & Berglund, K. (2016). Seasonal CO2 emissions under different cropping systems on Histosols in southern Sweden. Geoderma Regional 7, 338-345.
IINorberg, L., Berglund, Ö. & Berglund, K. (2016). Nitrous oxide and methane fluxes during the growing season from cultivated peat soils, peaty marl and gyttja clay under different cropping systems. Acta Agriculturae Scandinavica, Section B – Soil and Plant Science 66, 602-612.
IIINorberg, L., Berglund, Ö. & Berglund, K. Impact of soil properties and drainage on carbon dioxide emissions from undisturbed soil cores of cultivated peatland soils (submitted to Soil Biology and Biochemistry).
Place of Publication:Uppsala
Publisher:Department of Soil and Environment, Swedish University of Agricultural Sciences
ISBN for printed version:978-91-576-8833-0
ISBN for electronic version:978-91-576-8834-7
ISSN:1652-6880
Language:English
Publication Type:Doctoral thesis
Full Text Status:Public
Agris subject categories.:F Plant production > F08 Cropping patterns and systems
P Natural resources > P30 Soil science and management
Subjects:(A) Swedish standard research categories 2011 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Soil Science
Agrovoc terms:carbon dioxide, peat soils, peatlands, organic soils, greenhouse gases, cropping systems, drainage, nitrogen oxides, sweden
Keywords:carbon dioxide, peat, greenhouse gas, cropping system, drainage, nitrous oxide, marl
URN:NBN:urn:nbn:se:slu:epsilon-e-4135
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-e-4135
ID Code:14284
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(NL, NJ) > Dept. of Soil and Environment
(S) > Dept. of Soil and Environment
Deposited By: Mrs Lisbet/L Norberg
Deposited On:27 Apr 2017 14:01
Metadata Last Modified:27 Apr 2017 14:01

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