4.7 Article

Changes in organic carbon to clay ratios in different soils and land uses in England and Wales over time

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SCIENTIFIC REPORTS
卷 12, 期 1, 页码 -

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NATURE PORTFOLIO
DOI: 10.1038/s41598-022-09101-3

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  1. Rothamsted-Cranfield Soil Agricultural Research and Innovation Accelerator
  2. BBSRC
  3. Lawes Agricultural Trust
  4. Rothamsted Research
  5. Cranfield University
  6. Biotechnology and Biological Sciences Research Council (BBSRC) of the United Kingdom [BBS/E/C/000I0310, BBS/E/C/000 J0300]

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The study suggests that normalizing for clay concentration can provide a more meaningful separation between land uses in terms of soil organic carbon levels. Results indicated significant degradation in SOC/clay ratios in arable soils compared to permanent grass and woodland soils, highlighting the importance of setting realistic long-term targets for different land uses.
Realistic targets for soil organic carbon (SOC) concentrations are needed, accounting for differences between soils and land uses. We assess the use of SOC/clay ratio for this purpose by comparing changes over time in (a) the National Soil Inventory of England and Wales, first sampled in 1978-1983 and resampled in 1994-2003, and (b) two long-term experiments under ley-arable rotations on contrasting soils in the East of England. The results showed that normalising for clay concentration provides a more meaningful separation between land uses than changes in SOC alone. Almost half of arable soils in the NSI had degraded SOC/clay ratios (< 1/13), compared with just 5% of permanent grass and woodland soils. Soils with initially large SOC/clay ratios (>= 1/8) were prone to greater losses of SOC between the two NSI samplings than those with smaller ratios. The results suggest realistic long-term targets for SOC/clay in arable, ley grass, permanent grass and woodland soils are 1/13, 1/10, and > 1/8, respectively. Given the wide range of soils and land uses across England and Wales in the datasets used to test these targets, they should apply across similar temperate regions globally, and at national to sub-regional scales.

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