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| Article Title | WaNuLCAS, a model of water, nutrient and light capture in agroforestry systems | | Author | Meine van Noordwijk and Betha Lusiana | | Year | 1998/1999 | | Journal Title | Agroforestry Systems | | Institution | Kluwer Academic Publishers | | Volume | 43 | | Issue | 1-3 | | Pages | 217-242 | | Call Number | JA0139-04 | | Keywords | Agroforestry systems, Alley cropping, Trees, Soil, Crops, Soil water, Mathematical models, Plant water relations, Nitrogen, Soil water balance, Nutrient uptake |
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| Abstract: |
| Models of tree-soil-crop interactions in agroforestry should maintain a balance between dynamic processes and spatial patterns of interactions for common resources. An outline is given of, and major assumptions discussed, underlying the WaNuLCAS [Water, Nutrient and Light Capture in Agroforestry Systems] model of water, nitrogen and light interactions in agroforestry systems; this is a prototype model now at the testing stage. It uses the Stella Research modelling shell linked to Excel spreadsheets for data input and output, and represents a 4-layer (vertical) soil profile, and water and nutrient (at this stage only N) balance and uptake by a crop and a tree. The model was developed to deal with a wide range of agroforestry systems - hedgerow intercropping on flat or sloping land, fallow-crop mosaics, or isolated trees in parklands - with a minimum of parameter adjustments. Examples are presented for simulation runs of hedgerow intercropping systems at different hedgerow spacings and pruning regimes, a test of the safety-net function of deep tree roots, lateral interactions in crop-fallow mosaics and a first exploration for parkland systems with a circular geometry |
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