The hydrological response of heavy clay grassland soils to rainfall in south-west England using δ2H
Granger, Steven J.; Bol, Roland; Meier-Augenstein, Wolfram; Leng, Melanie J. 
ORCID: https://orcid.org/0000-0003-1115-5166; Kemp, Helen F.; Heaton, Tim H.E.; White, Sue M..
2010
The hydrological response of heavy clay grassland soils to rainfall in south-west England using δ2H.
Rapid Communications in Mass Spectrometry, 24 (5).
475-482.
10.1002/rcm.4281
Abstract/Summary
Stable isotopes of water have been previously used in catchment studies to separate rain-event water from pre-event groundwater. However, there are a lack of studies at the smaller scale looking at the separation of event water from pre-event water. This is particularly relevant for heavy clay soil systems through which the movement of water is uncertain but is thought to be rainwater-dominated. The data presented here were collected at a rural site in the south-west of England. The historic rainfall at the site was isotopically varied but similar to the global meteoric water line, with annual weighted means of -37 for 2H and -5.7 for 18O and with no seasonal variation. Drainage was sampled from the inter-flow (surface runoff + lateral through-flow) and drain-flow (55 cm deep mole drains) pathways of two 1 ha lysimeters during two rainfall events, which had 2H values of -68 and -92 , respectively. The 2H values of the lysimeter drainage water suggest that there was no contribution of event water during the first, small discharge (Q) event; however, the second larger event did show isotopic variation in 2H values negatively related to Q indicating that rainwater was contributing to Q. A hydrograph separation indicated that only 49-58% of the inter-flow and 18-25% of the drain-flow consisted of event water. This was surprising given that these soil types are considered retentive of soil water.
| Item Type: | Publication - Article |
|---|---|
| Digital Object Identifier (DOI): | 10.1002/rcm.4281 |
| Programmes: | BGS Programmes 2010 > NERC Isotope Geoscience Laboratory |
| ISSN: | 0951-4198 |
| NORA Subject Terms: | Agriculture and Soil Science |
| Date made live: | 15 Apr 2010 08:56 +0 (UTC) |
| URI: | https://nora.nerc.ac.uk/id/eprint/9601 |
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