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RESEARCH ARTICLE

Sensitivity analysis of soil parameters in the Agricultural Production Systems sIMulator (APSIM)

Iris Vogeler https://orcid.org/0000-0003-2512-7668 A * , Joanna Sharp B , Rogerio Cichota B and Linda Lilburne C
+ Author Affiliations
- Author Affiliations

A Department of Agroecology, Aarhus University, Blichers Alle 20, Tjele 8830, Denmark.

B The New Zealand Institute for Plant and Food Research Limited, Lincoln, New Zealand.

C Manaaki Whenua – Landcare Research, Lincoln, New Zealand.

* Correspondence to: iris.vogeler@agro.au.dk

Handling Editor: Gavan McGrath

Soil Research 61(2) 176-186 https://doi.org/10.1071/SR22110
Submitted: 12 May 2022  Accepted: 2 September 2022   Published: 20 September 2022

© 2023 The Author(s) (or their employer(s)). Published by CSIRO Publishing

Abstract

Context: The performance of process-based agroecosystem simulation models is highly sensitive to the numerous input parameters, many associated with high variability and uncertainty.

Aims: Our aims were to: (1) test the accuracy of the Agricultural Production Systems sIMulator (APSIM) model regarding the prediction of soil water storage and movement in a pasture system with a free draining pumice soil based on site-specific soil hydraulic properties; (2) identify sensitive soil hydraulic properties on model outputs; and (3) identify the influence of uncertainty in the description of soil properties on various model outputs.

Methods: We carried out a sensitivity analysis (SA) to identify sensitive soil hydraulic parameters. We set up APSIM to simulate a pasture system on a free-draining pumice soil in New Zealand. The model was first established with site-specific soil hydraulic properties and outputs were compared with measured soil moisture status and drainage. Next, the model’s sensitivity to the soil hydraulic parameters was assessed for various outputs linked to production and environmental outcomes.

Key results: Varying the various hydraulic parameters affected soil moisture status, but it had generally little effect on drainage, N leaching, and pasture production in this system.

Conclusions: The results suggest that for well-drained soils in a high precipitation zone with no water limitation, the model has low sensitivity to soil hydraulic parameters. Further analysis is required for different soils and for drier conditions.

Implications: For well-drained soils and under non-limiting water conditions the use of general data from databases, rather than site specific measurement of hydraulic properties is justified.

Keywords: crop modelling, environmental modelling, nitrate leaching, pasture dry matter production, soil databases, soil hydraulic properties, soil variability.


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