Spatial variation in evapotranspiration and the influence of land use on catchment hydrology

Dunn, Sarah; Mackay, R.

doi:10.1016/0022-1694(95)02733-6

Cited by 169 publications

(92 citation statements)

References 9 publications

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“…The accuracy for the liquid and soil water isotope analysis result in a precision limit for lc-excess of about 1.1 and 3.4 ‰, respectively. To infer dynamics of potential evaporation rates, we estimated PET with the Penman-Monteith equation adjusted for the Scottish Highlands by Dunn and Mackay (1995). Note that we focus in our study on the PET dynamics and that the absolute values could vary depending on the aerodynamic and roughness parameter of different vegetation covers.…”

Section: Discussionmentioning

confidence: 99%

Soil water stable isotopes reveal evaporation dynamics at the soil–plant–atmosphere interface of the critical zone

Sprenger

Tetzlaff

Soulsby

2017

Hydrol. Earth Syst. Sci.

147

165

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Abstract. Understanding the influence of vegetation on water storage and flux in the upper soil is crucial in assessing the consequences of climate and land use change. We sampled the upper 20 cm of podzolic soils at 5 cm intervals in four sites differing in their vegetation (Scots Pine (Pinus sylvestris) and heather (Calluna sp. and Erica Sp)) and aspect. The sites were located within the Bruntland Burn longterm experimental catchment in the Scottish Highlands, a low energy, wet environment. Sampling took place on 11 occasions between September 2015 and September 2016 to capture seasonal variability in isotope dynamics. The pore waters of soil samples were analyzed for their isotopic composition (δ 2 H and δ 18 O) with the direct-equilibration method. Our results show that the soil waters in the top soil are, despite the low potential evaporation rates in such northern latitudes, kinetically fractionated compared to the precipitation input throughout the year. This fractionation signal decreases within the upper 15 cm resulting in the top 5 cm being isotopically differentiated to the soil at 15-20 cm soil depth. There are significant differences in the fractionation signal between soils beneath heather and soils beneath Scots pine, with the latter being more pronounced. But again, this difference diminishes within the upper 15 cm of soil. The enrichment in heavy isotopes in the topsoil follows a seasonal hysteresis pattern, indicating a lag time between the fractionation signal in the soil and the increase/decrease of soil evaporation in spring/autumn. Based on the kinetic enrichment of the soil water isotopes, we estimated the soil evaporation losses to be about 5 and 10 % of the infiltrating water for soils beneath heather and Scots pine, respectively. The high sampling frequency in time (monthly) and depth (5 cm intervals) revealed high temporal and spatial variability of the isotopic composition of soil waters, which can be critical, when using stable isotopes as tracers to assess plant water uptake patterns within the critical zone or applying them to calibrate traceraided hydrological models either at the plot to the catchment scale.

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Section: Discussionmentioning

confidence: 99%

Soil water stable isotopes reveal evaporation dynamics at the soil–plant–atmosphere interface of the critical zone

Sprenger

Tetzlaff

Soulsby

2017

Hydrol. Earth Syst. Sci.

147

165

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“…One site at Braemar situated 15 km from the catchment also had daily snow depth data, which we used. Potential evapotranspiration was estimated using a modified Penman-Monteith equation (Dunn and Mackay 1995).…”

Section: Hydrological and Biogeochemical Datamentioning

confidence: 99%

Modelling landscape controls on dissolved organic carbon sources and fluxes to streams

et al. 2014

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Catchment dissolved organic carbon (DOC) fluxes are governed by complex interactions, which control biogeochemical processes generating DOC and hydrological connectivity, facilitating transport through the landscape to streams. This paper presents the development of a coupled hydrologicalbiogeochemical model for a northern watershed with organic-rich soils, to simulate daily DOC concentrations. The parsimonious model design allows the relative importance of DOC fluxes from the major landscape units (e.g. hillslopes, groundwater and riparian saturation area) to be determined. The dynamic extent of the saturated riparian zone, which at maximum wetness comprised 40 % of the drainage area, contributed 84 % of DOC to the stream, of which 16 % was derived from the hillslope soils. This shows the disproportional riparian influence on stream water chemistry and the importance of the non-linearity in hydrological connectivity. The temporal connectivity of each of the landscape units was dependent on antecedent moisture conditions, with highly transient connections between the hillslope and valley bottom saturated area, which were entirely disconnected during the driest periods. The groundwater contribution remained constant, but its relative importance increased during the driest periods. The study emphasises the importance of conceptualising hydrological connectivity and its relation to hydroclimatic factors, as well soil biogeochemical processes, when modelling stream water DOC.

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“…An option often considered [Hibbert, 1983;Carlson et al, 1990;Jofre and Rambal, 1993;Davis, 1993] is to replace deep-rooted woody species, which may intercept a substantial amount of precipitation [Eddieman and Miller, 1991] and have high whole-plant transpiration rates due to high leaf areas [Angell and Miller, 1994;Owens, 1996], with shallow-rooted herbaceous vegetation that usually intercepts less precipitation and has less leaf area. The amount of increased water yields from these watersheds, if any, resulting from vegetation management depends upon vegetation type or land use [Dunn and Mackay, 1995], vegetation treatment type or soils [Richardson et al, 1979], and climate [Griffen and McCarl, 1989].…”

Section: Introductionmentioning

confidence: 99%

Effect of removal of Juniperus ashei on evapotranspiration and runoff in the Seco Creek Watershed

Dugas¹,

Hicks²,

Wright³

1998

Water Resources Research

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Spatial variation in evapotranspiration and the influence of land use on catchment hydrology

Cited by 169 publications

References 9 publications

Soil water stable isotopes reveal evaporation dynamics at the soil–plant–atmosphere interface of the critical zone

Soil water stable isotopes reveal evaporation dynamics at the soil–plant–atmosphere interface of the critical zone

Modelling landscape controls on dissolved organic carbon sources and fluxes to streams

Effect of removal of Juniperus ashei on evapotranspiration and runoff in the Seco Creek Watershed

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