Scientific challenges and biophysical knowledge gaps for implementing nutrient offset projects

Lü, Junchang; Burton, Joanne; Garzon‐Garcia, Alexandra; Jackson, Christopher J.; Newham, Michael; Bloesch, P. M.; Ramsay, Ian; Rogers, Jenny; Griffith, Merran; Saeck, Emily; Burford, Michele A.

doi:10.1016/j.jenvman.2023.117902

Cited by 3 publications

(1 citation statement)

References 128 publications

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“…The high P export is likely due to erodible fertile soils that contain higher P than N, and the application of sulphur phosphate fertilizers on horticultural land in the Lockyer Creek catchment (Dickson & Asher, 1974;Sarker et al, 2008). Our data indicate that the relative increase in TN concentrations between low flow and high flow was less than for TP, as the high-flow events contributed sediment from the catchment that was enriched in phosphorus compared with nitrogen (see Lu et al, 2023). A study by Alvarez-Cobelas et al In-stream processes, such as nutrient processing (e.g., uptake and denitrification), can significantly affect water quality under low flow (Cunha et al, 2018;Hensley et al, 2014).…”

Section: Unbalanced Nutrient Exports From the Lockyer Creek Catchmentmentioning

confidence: 76%

Groundwater levels, climate and anthropogenic factors affect the hydrology and water quality of an intermittent and a regulated subtropical stream

Kim,

Lu,

Roberts

et al. 2024

Hydrological Processes

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Stream hydrology and water quality are highly interconnected and impacted by climate, land use and geology. We examined this connection using monitoring data from 2000 to 2019 for two streams with contrasting hydrological regimes—intermittent and regulated perennial—in subtropical Queensland, Australia. Our main objective was to evaluate relationships between groundwater levels, climate and flow regulation on the hydrology and water quality of an intermittent and a regulated subtropical stream. In intermittently flowing Lockyer Creek, flow was highly dependent on groundwater levels and occurred when the aquifer was recharged to elevations exceeding the upper 90‐percentile value. With 9.4% of the catchment area in irrigated horticulture, flow in Lockyer Creek was also likely to be reduced by drawdown of the aquifer for irrigation, with no flow for 30% to 81% of days over the observation period for stations in Lockyer Creek. In contrast, flow in the mid‐Brisbane River was continuous, regulated by discharge from a large upstream dam. Nutrient and suspended sediment concentrations in Lockyer Creek were generally higher than in the mid‐Brisbane River, likely associated with runoff from agricultural areas adjacent to the stream, while the upstream dam likely reduced the concentration and variability of nutrients and suspended sediment in the mid‐Brisbane River. During periods of low flow in the mid‐Brisbane River, longitudinal changes in nutrient and suspended sediment concentrations occurred, notably a significant decrease in total and dissolved inorganic nitrogen concentrations downstream (p < 0.05), indicating a possible effect of in‐stream algal uptake and denitrification. This study highlights the impact of human modifications on stream hydrology and water quality in the face of climate change. The findings can inform decision‐making on groundwater irrigation or dam release control for water security.

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Section: Unbalanced Nutrient Exports From the Lockyer Creek Catchmentmentioning

confidence: 76%

Groundwater levels, climate and anthropogenic factors affect the hydrology and water quality of an intermittent and a regulated subtropical stream

Kim,

Lu,

Roberts

et al. 2024

Hydrological Processes

Self Cite

View full text Add to dashboard Cite

show abstract

Nutrient metrics to compare algal photosynthetic responses to point and non-point sources of nitrogen pollution

Lu,

Garzon-Garcia,

Chuang

et al. 2024

Ecological Indicators

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Temporal and spatial water quality impacts of point-source versus catchment-derived nitrogen loads in an urbanised estuary

Newham,

Olley,

Orr

et al. 2024

Science of The Total Environment

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Scientific challenges and biophysical knowledge gaps for implementing nutrient offset projects

Cited by 3 publications

References 128 publications

Groundwater levels, climate and anthropogenic factors affect the hydrology and water quality of an intermittent and a regulated subtropical stream

Groundwater levels, climate and anthropogenic factors affect the hydrology and water quality of an intermittent and a regulated subtropical stream

Nutrient metrics to compare algal photosynthetic responses to point and non-point sources of nitrogen pollution

Temporal and spatial water quality impacts of point-source versus catchment-derived nitrogen loads in an urbanised estuary

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