Details
| Original language | English |
|---|---|
| Pages (from-to) | 102-112 |
| Number of pages | 11 |
| Journal | Soil and Tillage Research |
| Volume | 185 |
| Publication status | Published - Jan 2019 |
| Externally published | Yes |
Abstract
In this study, structural recovery of degraded cropland, which was converted to permanent grassland and managed under no-till and no-renovation condition, was evaluated. We combined hydrostructural parameters with shrinkage characteristics and X-ray computed microtomography (μCT) analysis at three depths, to determine the mechanism for soil structural recovery over a 19-year period. The results showed that the total porosity and hydraulic properties were improved, with the age of the regenerating grassland, due to a better rearrangement of soil particles which in combination with the shrinkage induced realignment of pores in the soil matrix, resulted in better pore continuity. Changes in hydraulic stresses were most pronounced in the intensely rooted soil layers with further enhancement of the soil structure during restoration. This was similarly observed in the reconstructed images, which further highlight the strong contribution from the root development and organic matter conversion to the improved pore networks. Our result also showed that ignoring the depth and time dependent shrinkage behaviour of within the soil matrix resulted in overestimation of water retention potential in the first 8 years since the commencement of the restoration programme, and in the underestimation of water retention in the structurally stable soil beyond this period The results from these combined analyses; allowed a more methodical, detailed, quantitative and qualitative assessment of temporal soil structural recovery in naturally recovering grassland soil.
Keywords
- Amelioration, Hydraulic properties, Permanent grassland, Shrinkage, X-ray computed microtomography (μCT)
ASJC Scopus subject areas
- Agricultural and Biological Sciences(all)
- Agronomy and Crop Science
- Agricultural and Biological Sciences(all)
- Soil Science
- Earth and Planetary Sciences(all)
- Earth-Surface Processes
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In: Soil and Tillage Research, Vol. 185, 01.2019, p. 102-112.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Evaluation of temporal changes in hydrostructural properties of regenerating permanent grassland soils based on shrinkage properties and μCT analysis
AU - Ajayi, A. E.
AU - Horn, R.
AU - Rostek, Jens
AU - Uteau, D.
AU - Peth, S.
N1 - Funding information: The first author appreciates the Alexander von Humboldt Fellowship for the George Foster Research Fellowship. Special thanks for the colleagues in the Institute for assistance in sampling. Very special thanks to the 2 anonymous reviewers, whose detailed and constructive criticism of the original draft, assisted greatly in improving the final manuscript.
PY - 2019/1
Y1 - 2019/1
N2 - In this study, structural recovery of degraded cropland, which was converted to permanent grassland and managed under no-till and no-renovation condition, was evaluated. We combined hydrostructural parameters with shrinkage characteristics and X-ray computed microtomography (μCT) analysis at three depths, to determine the mechanism for soil structural recovery over a 19-year period. The results showed that the total porosity and hydraulic properties were improved, with the age of the regenerating grassland, due to a better rearrangement of soil particles which in combination with the shrinkage induced realignment of pores in the soil matrix, resulted in better pore continuity. Changes in hydraulic stresses were most pronounced in the intensely rooted soil layers with further enhancement of the soil structure during restoration. This was similarly observed in the reconstructed images, which further highlight the strong contribution from the root development and organic matter conversion to the improved pore networks. Our result also showed that ignoring the depth and time dependent shrinkage behaviour of within the soil matrix resulted in overestimation of water retention potential in the first 8 years since the commencement of the restoration programme, and in the underestimation of water retention in the structurally stable soil beyond this period The results from these combined analyses; allowed a more methodical, detailed, quantitative and qualitative assessment of temporal soil structural recovery in naturally recovering grassland soil.
AB - In this study, structural recovery of degraded cropland, which was converted to permanent grassland and managed under no-till and no-renovation condition, was evaluated. We combined hydrostructural parameters with shrinkage characteristics and X-ray computed microtomography (μCT) analysis at three depths, to determine the mechanism for soil structural recovery over a 19-year period. The results showed that the total porosity and hydraulic properties were improved, with the age of the regenerating grassland, due to a better rearrangement of soil particles which in combination with the shrinkage induced realignment of pores in the soil matrix, resulted in better pore continuity. Changes in hydraulic stresses were most pronounced in the intensely rooted soil layers with further enhancement of the soil structure during restoration. This was similarly observed in the reconstructed images, which further highlight the strong contribution from the root development and organic matter conversion to the improved pore networks. Our result also showed that ignoring the depth and time dependent shrinkage behaviour of within the soil matrix resulted in overestimation of water retention potential in the first 8 years since the commencement of the restoration programme, and in the underestimation of water retention in the structurally stable soil beyond this period The results from these combined analyses; allowed a more methodical, detailed, quantitative and qualitative assessment of temporal soil structural recovery in naturally recovering grassland soil.
KW - Amelioration
KW - Hydraulic properties
KW - Permanent grassland
KW - Shrinkage
KW - X-ray computed microtomography (μCT)
UR - http://www.scopus.com/inward/record.url?scp=85053464803&partnerID=8YFLogxK
U2 - 10.1016/j.still.2018.09.005
DO - 10.1016/j.still.2018.09.005
M3 - Article
AN - SCOPUS:85053464803
VL - 185
SP - 102
EP - 112
JO - Soil and Tillage Research
JF - Soil and Tillage Research
SN - 0167-1987
ER -