Use of virtual 3D maize canopies to assess the effect of plot heterogeneity on radiation interception

Citation
B. Pommel et al., Use of virtual 3D maize canopies to assess the effect of plot heterogeneity on radiation interception, AGR FOR MET, 110(1), 2001, pp. 55-67
Citations number
24
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Agriculture/Agronomy
Journal title
AGRICULTURAL AND FOREST METEOROLOGY
ISSN journal
0168-1923 → ACNP
Volume
110
Issue
1
Year of publication
2001
Pages
55 - 67
Database
ISI
SICI code
0168-1923(200112)110:1<55:UOV3MC>2.0.ZU;2-R
Abstract
Plants neighbouring gaps in the stand have a better grain yield because the y intercept a larger amount of light. The question arises which part of thi s increase is due to larger incident radiation and which part to changes in plant morphology. Reproducible within-row and between-row variations in maize plant spacing r elevant to agricultural practice were established in the field, by suppress ing some seedlings just after the stand was establish. Virtual plots, with the same plant arrangement, were simulated with the ADEL-Maize model. The m odel, based on L-system formalism, simulated 3D canopies and a projection m ethod was used to calculate intercepted radiation. Two types of simulation were performed, that is with or without the adaptations in plant morphology that had been observed in the field for plants adjacent to gaps. The accum ulated radiation intercepted by individual plants calculated on models with unchanged leaf size is only from 89 to 98% of that corresponding with obse rved leaf size. We calculated the grain yield for each plant location, base d on the radiation intercepted (calculated for virtual plants with observed leaf sizes, and for virtual plants with unchanged leaf sizes). Leaf size a daptation increases grain production by 0.6-11.7%. We calculated the cumulative radiation intercepted by three regular canopie s, presenting a regular distribution at three different plant population de nsities. They consisted of the same plant number, on the same surface area. as the irregular treatments in the neighbouring of the gaps. The irregular ity of plant spacing resulted in an interception about 10% less than at con stant plant population density. (C) 2001 Elsevier Science B.V All rights re served.