Application of non-linear mathematics and stochastic modelling to complex biological systems

Lead Research Organisation: Rothamsted Research
Department Name: UNLISTED

Abstract

Abstracts are not currently available in GtR for all funded research. This is normally because the abstract was not required at the time of proposal submission, but may be because it included sensitive information such as personal details.

Technical Summary

This project aims to develop novel mathematical approaches, based on non-linear mathematics and stochastic modelling, to analyse and predict the behaviour of complex agricultural and biological systems underpinning predictive systems biology. Key objectives of the project are:

1. Modelling impact of climate change
The probability and the magnitude of extreme events and impacts on crops are likely to increase under climate change. We will develop methodology and computational tools to analyse extreme impacts on crops and plant communities under climate change. Specifically:
a) to develop local-scale climate scenarios, based on the LARS-WG Weather Generator, a multi-model ensemble of global and regional climate models
b) to develop a dataset of LARS-WG baseline parameters for Europe with a 25 km grid.

2. Crop modelling
Crop models provide a consistent framework for integrating our understanding of plant processes as influenced by environments. Specifically:
a) to use crop simulation models to deconvolute complex traits, such as nitrogen use efficiency (NUE) or water use efficiency (WUE);
b) to develop computational tools for evaluating performance of new genotypes in diverse environments.

3. Individual-based modelling
The development of resistance in pest insects to insecticides is a significant barrier to sustainable farming. The evolution of resistance is affected by many factors limiting applications of classical modelling approaches. We will develop an individual-based model (IbM) that includes genetic status, individual behaviours, multitrophic interactions and environmental heterogeneity. Specifically:
a) to develop a predictive high-performance IbM;
b) to develop approaches for analysis of stochastic high-dimensional IbM output;
c) to predict of the evolution of resistance in model systems.

Planned Impact

unavailable

Publications

10 25 50

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Butterworth MH (2010) North-South divide: contrasting impacts of climate change on crop yields in Scotland and England. in Journal of the Royal Society, Interface

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Iizumi T (2012) ELPIS-JP: a dataset of local-scale daily climate change scenarios for Japan. in Philosophical transactions. Series A, Mathematical, physical, and engineering sciences

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Kauserud H (2010) Climate change and spring-fruiting fungi. in Proceedings. Biological sciences

 
Description A wheat simulation model, Sirius, has been developed and tested. This model was used in the impact assessment of climate change on wheat in the UK and Europe. Downscaling methodology for generation of local-scale climate scenarios has been developed. It was based on the LARS-WG weather generator and climate projections from the CMIP3 ensemble of global climate models.
Exploitation Route Local-scale climate scenarios has been already used in many impact studies in the UK, and worldwide. Sirius wheat model has been used in international model intercomparison and improvements such as AgMIP and MACSUR.
Sectors Agriculture

Food and Drink

Environment

URL http://www.rothamsted.ac.uk/mas-models/sirius
 
Description Results and publications were used in the IPCC Assessment Report 5 to advise governments on climate change adaptation and mitigation.
First Year Of Impact 2014
Sector Agriculture, Food and Drink,Environment
Impact Types Policy & public services

 
Description Modelling resistance using IbM
Amount £150,000 (GBP)
Organisation Syngenta International AG 
Sector Private
Country Switzerland
Start 05/2016 
End 05/2017
 
Title ELPIS 
Description ELPIS is a dataset of site parameters for the LARS-WG weather generator for Europe. 
Type Of Material Database/Collection of data 
Year Produced 2012 
Provided To Others? Yes  
Impact ELPIS has been used to generate local-scale climate scenarios for Europe using LARS-WG and climate projections from the CMIP5 ensemble. These scenarios have been used in many projects including MACSUR. 
URL http://www.rothamsted.ac.uk/mas-models/larswg
 
Title LARS-WG stochastic weather generator 
Description LARS-WG is a model simulating time-series of daily weather at a single site. It can be used: 1. to generate long time-series suitable for the assessment of agricultural and hydrological risk; 2. to provide the means of extending the simulation of weather to unobserved locations; 3. to serve as a computationally inexpensive tool to produce daily site-specific climate scenarios for impact assessments of climate change. LARS-WG version 5.0 includes climate scenarios based on 15 Global Climate Models (GCMs) which have been used in the IPCC 4AR (2007). This large dataset of future climate projections was produced by leading modelling groups worldwide who performed a set of coordinated climate experiments in which GCMs have been run for a common set of experiments and emission scenarios. Multi-model ensembles allow to explore the uncertainty in climate predictions resulting from structural differences in the global climate model design as well as uncertainty in variations of initial conditions or model parameters. The new version also improves simulation of extreme weather events, such as extreme daily precipitation, long dry spells and heat waves. LARS-WG has been well validated in diverse climates around the world. 
Type Of Technology Software 
Year Produced 2015 
Impact LARS-WG has been used in more than 65 countries for research and in several Universities as an educational tool. Climate scenarios generated by LARS-WG have been used in the impact assessments of climate change for the IPCC Assessment Report 5. 
URL http://www.rothamsted.ac.uk/mas-models/larswg
 
Title SIRIUS wheat simulation model 
Description Sirius is a wheat simulation model that calculates biomass from intercepted photosynthetically active radiation and grain growth from simple partitioning rules. Leaf area index (LAI) is developed from a simple thermal time sub-model. Phenological development is calculated from the mainstem leaf appearance rate and final leaf number, with the latter determined by responses to daylength and vernalisation. Effects of water and N deficits are calculated through their influences on LAI development and radiation-use efficiency. Sirius has been calibrated for several modern wheat cultivars and was able to simulate crop growth accurately in a wide range of conditions, including Europe, NZ/Australia and USA and under climate change 
Type Of Technology Software 
Year Produced 2015 
Impact Sirius is used in research by many scientists to understand crop responses to environmental variations, and in practice by farmers to optimize water and N management. 
URL http://www.rothamsted.ac.uk/mas-models/sirius