Contributions of soil biota to C sequestration varied with aggregate fractions under different tillage systems

Zhang, Shixiu; Li, Qi; Lü, Ying; Zhang, Xiaoping; Liang, Wenju

doi:10.1016/j.soilbio.2013.03.023

Cited by 183 publications

(100 citation statements)

References 73 publications

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“…However this analysis is only partial as it does not include Soil Organic Carbon (SOC) changes and N2O emissions. A more complete assessment would require consolidated data and models to become available for NT practices on: rate, level and duration of SOC sequestration, physical partitioning of SOC in soil aggregate fractions, evolution of soil aggregate stability, role of microorganisms on SOC humification and stabilization, N2O emission dynamics, appropriate nitrogen fertilization [65][66][67]. Early experimental results indicate that correct implementation of the NT agricultural system (above all, improved use of N fertilisers) can consolidate the benefits of soil C sequestration and minimize N2O emissions [68][69][70], potentially making the balance more favourable for the NT practices than what was found in this work.…”

Section: Discussionmentioning

confidence: 99%

Environmentally Sustainable Biogas? The Key Role of Manure Co-Digestion with Energy Crops

et al. 2015

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Abstract:We analysed the environmental impacts of three biogas systems based on dairy manure, sorghum and maize. The geographical scope of the analysis is the Po valley, in Italy. The anaerobic digestion of manure guarantees high GHG (Green House Gases) savings thanks to the avoided emissions from the traditional storage and management of raw manure as organic fertiliser. GHG emissions for maize and sorghum-based systems, on the other hand, are similar to those of the Italian electricity mix. In crop-based systems, the plants with open-tank storage of digestate emit 50% more GHG than those with gas-tight tanks. In all the environmental impact categories analysed (acidification, particulate matter emissions, and eutrophication), energy crops based systems have much higher impacts than the Italian electricity mix. Maize-based systems cause higher impacts than sorghum, due to more intensive cultivation. Manure-based pathways have always lower impacts than the energy crops based pathways, however, all biogas systems cause much higher impacts than the current Italian electricity mix. We conclude that manure digestion OPEN ACCESSEnergies 2015, 8 5235 is the most efficient way to reduce GHG emissions; although there are trade-offs with other local environmental impacts. Biogas production from crops; although not providing environmental benefits per se; may be regarded as an option to facilitate the deployment of manure digestion.

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Section: Discussionmentioning

confidence: 99%

Environmentally Sustainable Biogas? The Key Role of Manure Co-Digestion with Energy Crops

et al. 2015

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“…The relatively higher abundance of omnivores-carnivores in NT and RT (Fig. 1), compared with CT, indicates that soil food webs in conservation tillage may offer biological buffering capacity and prevent individual organisms (i.e., nematode pests) from becoming dominant through predation (Yeates and Wardle, 1996;DuPont et al, 2009;Zhang et al, 2013).…”

Section: Effects Of Tillage On Soil Microbial and Nematode Communitiesmentioning

confidence: 99%

Conservation tillage positively influences the microflora and microfauna in the black soil of Northeast China

Zhang

Lü

et al. 2015

Soil and Tillage Research

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“…In contrast, NT can promote soil surface macro-aggregation and improve structural stability due to lower soil disturbance and higher SOC, arbuscular mycorrhizal fungi, and microbial biomass and glomalin, which are more important driving factors for aggregate stability, and consequently enhance C retention (Castro et al, 1998;Blanco-Moure et al, 2012;Zhang et al, 2012Zhang et al, , 2013.…”

Section: Introductionmentioning

confidence: 99%

Water-Stable Aggregates and Associated Carbon in a Subtropical Rice Soil Under Variable Tillage

Liu

Chen

et al. 2016

Rev. Bras. Ciênc. Solo

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Tillage systems can influence C sequestration by changing aggregate formation and C distribution within the aggregate. This study was undertaken to explore the impact of no-tillage without straw (NT-S) and with straw (NT+S), and moldboard plow without straw (MP-S) and with straw (MP+S), on soil aggregation and aggregate-associated C after six years of double rice planting in a Hydragric Anthrosol in Guangxi, southwest of China. Soil samples of 0.00-0.05, 0.05-0.20 and 0.20-0.30 m layers were wet-sieved and divided into four aggregate-size classes, >2 mm, 2.00-0.25 mm, 0.25-0.053 and <0.053 mm, respectively, for measuring aggregate associated C and humic and fulvic acids. Results showed that the soil organic carbon (SOC) stock in bulk soil was 40.2-51.1 % higher in the 0.00-0.05 m layer and 11.3-17.0 % lower in the 0.05-0.20 m layer in NT system (NT+S and NT-S) compared to the MP system (MP+S and MP-S), respectively. However, no statistical difference was found across the whole 0.00-0.30 m layer. The NT system increased the proportion of >2 mm aggregate fraction and reduced the proportion of <0.053 mm aggregates in both 0.00-0.05 and 0.05-0.20 m layers. The SOC concentration, SOC stock and humic and fulvic acids within the >0.25 mm macroaggregate fraction also significantly increased in the 0.00-0.5 m layer in NT system. However, those within the 2.00-0.25 mm aggregate fraction were significantly reduced in the 0.05-0.200 m layer under NT system. Straw incorporation increased not only the SOC stock in bulk soil, but also the proportion of macroaggregate, aggregate associated with SOC and humic and fulvic acids concentration within the aggregate. The effect of straw on C sequestration might be dependent on the location of straw incorporation. In conclusion, the NT system increased the total SOC accumulation and humic and fulvic acids within macroaggregates, thus contributing to C sequestration in the 0.00-0.05 m layer.

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Contributions of soil biota to C sequestration varied with aggregate fractions under different tillage systems

Cited by 183 publications

References 73 publications

Environmentally Sustainable Biogas? The Key Role of Manure Co-Digestion with Energy Crops

Environmentally Sustainable Biogas? The Key Role of Manure Co-Digestion with Energy Crops

Conservation tillage positively influences the microflora and microfauna in the black soil of Northeast China

Water-Stable Aggregates and Associated Carbon in a Subtropical Rice Soil Under Variable Tillage

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