Riparian protection and on‐farm best management practices for restoration of a lowland stream in an intensive dairy farming catchment: A case study

Autor:	Donald Shearman, D. A. Costall, Mike R. Scarsbrook, Bruce S. Thorrold, Chris R. Fowles, Robert J. Wilcock, Keith Betteridge
Rok vydání:	2009
Předmět:	Suspended solids geography Irrigation geography.geographical_feature_category Ecology Drainage basin Aquatic Science Agronomy Environmental science Water quality Effluent Dairy farming Stream load Ecology Evolution Behavior and Systematics Water Science and Technology Riparian zone
Zdroj:	New Zealand Journal of Marine and Freshwater Research. 43:803-818
ISSN:	1175-8805 0028-8330
DOI:	10.1080/00288330909510042
Popis:	Poor water quality (high concentrations of nitrogen (N), phosphorus (P), suspended solids (SS), and faecal bacteria) in Waiokura Stream, southern Taranaki, New Zealand, is attributed to diffuse and point source (PS) inputs from dairy farming. Trend analysis of concentration time‐series data (2001–2008) and annual yields (i.e., stream load divided by catchment area) showed that significant improvements occurring since 2001 may be attributed to changes in farming practices and riparian management. Yields of filterable reactive P, total P and SS declined by 25–40% as a result of increased riparian protection, a reduction in dairy shed effluent (DSE) pond discharges from 8 to 6 with conversion to land irrigation, and a 25% reduction in the average application rate of P fertiliser. Median annual Escherichia coli concentrations declined at a rate of 116 per 100 ml per year, as a result of fewer PS discharges and improved riparian management. Thus, improvements in stream water quality were attributed to...
Databáze:	OpenAIRE
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