Soil degradation and recovery – changes in organic matter fractions and structural stability

A - Papers appearing in refereed journals

Jensen, J. L., Schjonning, P., Watts, C. W., Christensen, B. T, Obour, P. B. and Munkholm, L. J. 2020. Soil degradation and recovery – changes in organic matter fractions and structural stability . Geoderma. 364, p. 114181.

AuthorsJensen, J. L., Schjonning, P., Watts, C. W., Christensen, B. T, Obour, P. B. and Munkholm, L. J.
Abstract

The combination of concurrent soil degradation and restoration scenarios in a long-term experiment with contrasting treatments under steady-state conditions, similar soil texture and climate make the Highfield land-use change experiment at Rothamsted Research unique. We used soil from this experiment to quantify rates of change in organic matter (OM) fractions and soil structural stability (SSS) six years after the management changed. Soil degradation included the conversion of grassland to arable and bare fallow management, while soil restoration comprised introduction of grassland in arable and bare fallow soil. Soils were tested for clay dispersibility measured on two macro-aggregate sizes (DispClay 1-2 mm and DispClay 8-16 mm) and clay-SOM disintegration (DI, the ratio between clay particles retrieved without and with SOM removal). The SSS tests were related to soil organic carbon (SOC), permanganate oxidizable C (POXC) and hot water-extractable C (HWC). The decrease in SOC after termination of grassland was greater than the increase in SOC when introducing grassland. In contrast, it was faster to restore degraded soil than to degrade grassland soil with respect to SSS at macro-aggregate scale. The effect of management changes was more pronounced for 8-16 mm than 1-2 mm aggregates indicating a larger sensitivity towards tillage-induced breakdown of binding agents in larger aggregates. At microscale, SSS depended on SOC content regardless of management. Soil management affected macroscale structural stability beyond what is revealed from measuring changes in OM fractions, underlining the need to include both bonding and binding mechanisms in the interpretation of changes in SSS induced by management.

KeywordsSoil restoration; Soil degradation; Rate of change; Soil structural stability; Soil organic carbon; Soil management
Year of Publication2020
JournalGeoderma
Journal citation364, p. 114181
Digital Object Identifier (DOI)doi:10.1016/j.geoderma.2020.114181
Web address (URL)https://authors.elsevier.com/sd/article/S0016706119310572
Open accessPublished as ‘gold’ (paid) open access
FunderBiotechnology and Biological Sciences Research Council
Lawes Agricultural Trust
Funder project or codeBBS/E/C00J0300
The Rothamsted Long Term Experiments [2017-2022]
Publisher's version
Output statusE-publication ahead of print
Publication dates
Online20 Jan 2020
Publication process dates
Accepted12 Jan 2020
PublisherElsevier Science Bv
ISSN0016-7061

Permalink - https://repository.rothamsted.ac.uk/item/97101/soil-degradation-and-recovery-changes-in-organic-matter-fractions-and-structural-stability

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