期刊
EUROPEAN JOURNAL OF SOIL SCIENCE
卷 72, 期 2, 页码 829-841出版社
WILEY
DOI: 10.1111/ejss.13037
关键词
3D pore characteristics; agricultural management practices; porosity; soil structure; X-ray computed tomography
类别
资金
- BBSRC [BBS/E/C/000I0310]
- Biotechnology and Biological Sciences Research Council [BBS/E/C/000J0300]
- Natural Environment Research Council
- Achieving Sustainable Agricultural Systems research programme [NE/N018125/1 LTS-M]
- BBSRC [BBS/E/C/000J0300, BBS/E/C/00004881, BBS/E/C/000I0310] Funding Source: UKRI
Agricultural practices can significantly influence the physical and biological properties of soil, with conversion to grassland leading to notable changes in soil structure over a period of at least a decade post-conversion. Conversion to arable land, on the other hand, did not show a significant impact on soil structural evolution.
Agricultural practices can have significant effects on the physical and biological properties of soil. The aim of this study was to understand how the physical structure of a compromised soil, arising from long-term bare-fallow management, was modified by adopting different field management practices. We hypothesized that changing agricultural practices from bare-fallow to arable or grassland would influence the modification of pore structure via an increase in porosity and pore connectivity, and a more homogenous distribution of pore sizes, and that this change exerts a rapid evolution of soil structure following conversion. Soil aggregates (<2 mm) collected in successive years from field plots subjected to three contrasting managements were studied: bare-fallow, bare-fallow converted to arable, and bare-fallow converted to grassland. Soil structure was assessed by X-ray computed tomography on the aggregates at 1.5 mu m resolution, capturing detail relevant to soil biophysical processes. The grassland system increased porosity, diversity of pore sizes, pore connectivity and pore-surface density significantly over the decade following conversion. However, measured at this resolution, the evolution of most of these metrics of soil structure required approximately 10 years post-conversion to show a significant effect. The arable system did not influence soil structural evolution significantly. Only pore size distribution was modified in grassland in a shorter time frame (2 years post-conversion). Hence, evolution of soil structural characteristics appears to require at least a decadal timescale following conversion to grassland. Highlights The physical structure of a compromised soil was modified by adopting plant-based field management practices. Conversion to grassland increased pore size diversity after 2 years. Porosity, pore connectivity and pore surface density showed a significant modification between 7 and 10 years after conversion.
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