Evidence details

01 Sep 2020

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Citation: Giling, D. P., Grace, M. R., Thomson, J. R., Mac Nally, R., & Thompson, R. M. (2013). Effect of Native Vegetation Loss on Stream Ecosystem Processes: Dissolved Organic Matter Composition and Export in Agricultural Landscapes. Ecosystems.
Study description: Giling et al. 2014 investigated how catchment land-use, hydrology, topography, and soil characteristics affected the quantity and composition of dissolved organic carbon (DOC) exported from agricultural streams in south-eastern Australia.

Cause term/trajectory: Land use/land cover - agriculture (Increase)
Cause description: Percentage of catchment used for pasture (grazing) ranging from 1 to 83%
Effect term/trajectory: Water quality - organic matter (Increase)
Effect description: Fluorescence Index (FI), which indicates the source of DOM. Generally, lower values indicate terrestrial sources and higher values indicate in-stream sources.
Response measure type: Slope coefficient (beta)
Response measure value: 0.052
Statistical significance: Yes (but assessed in a Bayesian analysis, so no p-value)
Documentation: Pg 90 and Figure 5 top left

Source data: Field
Study type: Observation
Study design: Spatial gradient
Number of independent control or reference sampling units: 10
Sample size used in analysis: 80
Design description: Duplicate filtered samples were collected from the sites seasonally for 1 year at baseflow conditions.