WWO biophysical susceptibility to N leaching and runoff
Description
Geospatial representation of monthly susceptibility of loss of nutrients either horizontally or vertically based on the soil and climate at each pixel.
Note: this does not take into account land use or actual nutrient inputs onto the land. Also known as Whitiwhiti Ora (WWO) Transport Factors for MfE's Risk Index Tool.
Date: October 2023 Version: v1
Owner: MWLR; PFR; NIWA
Contact:
- National Science Challenge Our Land and Water: Richard McDowell
- Manaaki Whenua Landcare Research: Linda Lilburne (spatial representation)
- Plant and Food Research: Rogerio Cichota (underlying modelling)
- AgResearch: Robyn Dynes (project lead)
Preview Image
Dataset attributes
| Spatial extent | All New Zealand excluding the conservation estate and Stewart and the Chatham Islands |
|---|---|
| Spatial resolution | 5km climate grid; FSl and S-map soil polygons |
| Temporal extent | Longterm/steady state |
| Temporal resolution | Monthly |
| Evaluation method (Validation) | Expert assessment |
| Evaluation result (Numeric) | N/A |
| Evaluation result (Categorical) | N/A |
| Uncertainty method | N/A |
| Uncertainty data format (Numeric) | N/A |
| Uncertainty data format (Categorical) | N/A |
Methodology
The monthly susceptibility surfaces were derived from tracing the nitrogen lost from a simulated urine patch using the Agricultural Production Systems Simulator (APSIM) model.
Simulations were set up in APSIM to describe a continuous ryegrass/white clover mixed pasture.
The simulation setup included the possibility of applying irrigation driven by soil moisture status, and nitrogen fertiliser.
Fitness for purpose / limitations
This table indicates whether the dataset is suitable for different types of questions at different scales.
Note: Users should carefully consider their purpose as this dataset may not be suitable.
| Operational | Absolute | Relative | Screening/scoping | |
|---|---|---|---|---|
| Block/farm | No | No | Maybe | Maybe |
| Multi-farms(5+) | No | No | Maybe | Maybe |
| Catchment | No | No | Maybe | Yes |
| National/regional | No | No | Yes | Yes | Caveat(s) | The modelling is preliminary and uses coarse scale climate and soil data.It assumes that the simulated loses from a urine patch under pasture are representative of any actual land use |
Data and Resources
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WWO biophysical susceptibility to nutrient lossGDB
License: CC BY 4.0 Attribute to: Whitiwhiti Ora, Our Land and Water. This...
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WWO biophysical susceptibility to nutrient loss (March 2024 v2)_PREVIEW.pngPNG
License: CC BY 4.0 Description This is the data preview image for the...