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Not all water becomes wine: Sulfur inputs as an opportune tracer of hydrochemical losses from vineyards

Water Resources Research

By:
, ,
DOI: 10.1029/2007WR006672

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Abstract

California's widespread and economically important vineyards offer substantial opportunities to understand the interface between hydrology and biogeochemistry in agricultural soils. The common use of native sulfur (S) as a fumigant or soil additive provides a novel way to isotopically differentiate among sulfate (SO2-4) pools, allowing the estimation of water and SO2-4 budgets. The objectives of this study were (1) to characterize the near-surface hydrological flow paths in a vineyard during irrigation and storm events and (2) to determine how those flow paths affect the fate and transport of SO2-4 across seasons. Integrating hydrological theory with measurements of SO2-4concentration and sulfate-S isotopic ratios (expressed as [SO 2-4] and ??34S, respectively) in inputs, soil water, and leachate provided a means of determining flow paths. Low [S04-] and ??34S in leachate during 4-h irrigation events reflect minimal engagement of the soil matrix, indicating that preferential flow was the dominant path for water in the near surface. In contrast, high [SO 2-4] and ??34S values during 8-h irrigation and storm events reflect near-complete engagement of the soil matrix, indicating that lateral flow was the dominant pathway. Because hydrologic response and SO2-4 mobility are tightly coupled in these soils, the magnitude of water fluxes through the near surface controls S cycling both on and off site. These results indicate that preferential flow is an important loss pathway to consider in managing both water resources and water quality (reactive elements) in vineyard land use systems. ?? 2008 by the American Geophysical Union.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Not all water becomes wine: Sulfur inputs as an opportune tracer of hydrochemical losses from vineyards
Series title:
Water Resources Research
DOI:
10.1029/2007WR006672
Volume
45
Issue:
7
Year Published:
2009
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article