Reference : Effect of different tillage systems on aggregate structure and inner distribution of ...
Scientific journals : Article
Life sciences : Agriculture & agronomy
Engineering, computing & technology : Civil engineering
http://hdl.handle.net/2268/203457
Effect of different tillage systems on aggregate structure and inner distribution of organic carbon
English
Gao, Lili mailto [Université de Liège - ULg > > > Form. doct. sc. agro. & ingé. biol. (paysage)]
Beckers, Eléonore mailto [Université de Liège > Ingénierie des biosystèmes (Biose) > Echanges Eau-Sol-Plantes >]
Liang, Guopeng [> >]
Houssou, Assa Albert [> >]
Huijun, Wu [> >]
Wu, Xiueping [> >]
Cai, Dianxiong [> >]
Degré, Aurore mailto [Université de Liège > Ingénierie des biosystèmes (Biose) > Echanges Eau-Sol-Plantes >]
15-Feb-2017
Geoderma
Elsevier Science
288
97-104
Yes (verified by ORBi)
International
0016-7061
[en] Marco-aggregate ; Soil organic carbon ; X- ray micro tomography
[en] Tillage is a common agricultural practice affecting soil structure and biogeochemistry. Pore network geometries are crucial to oxygen concentration, gas diffusivity, water location and water movement. Soil aggregates, 4–6 mm in diameter and collected from silty loam in Belgium and sandy loam in China, were scanned using a micro-computed tomography scanner. Images with a pixel size of 6.9 μm were then processed with ImageJ software for pore network analysis. The treatments were no tillage (C-NT) and conventional tillage (C-CT) in China, and shallow tillage (G-ST) and conventional tillage (G-CT) in Belgium. The results showed that aggregates in conservational tillage (G-ST and C-NT) had numerous connected pores compared with conventional tillage (G-CT and C-CT). The Euler number (Ev) was significantly lower and visible total porosity and surface area (SA) were significantly higher in conservational tillage (G-ST and C-NT) than in conventional tillage (G-CT and C-CT) in both studied locations.

The predominant size of pores was significantly higher in conservational tillage (G-ST and C-NT) than in conventional tillage (G-CT and C-CT) (> 150 μm vs 90–120 μm). Pore location within the aggregates also showed differences, with porosity being evenly distributed in the aggregates under conventional tillage (G-CT and C-CT). Under conservational tillage (G-ST and C-NT), the aggregates were heterogeneous, showing higher porosity at the center of the aggregates. There was a higher soil organic carbon (SOC) content in the external layer than in the internal layer in conservational tillage in Belgium (G-ST). In no tillage in China (C-NT), the SOC in the external and internal layers, however, showed similar results.

Overall, conventional tillage (G-CT and C-CT) reduced the proportion of the largest pores within soil aggregates, whereas there was no significant relationship between pore morphologies and SOC content. Further investigation is required to measure the active and slow carbon pool distribution in the different layers and under different tillage practices.
TERRA Research Centre - TERRA
http://hdl.handle.net/2268/203457
10.1016/j.geoderma.2016.11.005

File(s) associated to this reference

Fulltext file(s):

FileCommentaryVersionSizeAccess
Restricted access
Geoderma_20161116.pdfPublisher postprint1.75 MBRequest copy

Bookmark and Share SFX Query

All documents in ORBi are protected by a user license.