How good is the turbid medium-based approach for accounting for light partitioning in contrasted grass-legume intercropping systems?

被引:44
作者
Barillot, Romain [1 ]
Louarn, Gaetan [2 ]
Escobar-Gutierrez, Abraham J. [1 ,2 ]
Huynh, Pierre [1 ]
Combes, Didier [2 ]
机构
[1] LUNAM Univ, Grp Ecole Super Agr, UPSP Lab Ecophysiol Vegetale & Agroecol, F-49007 Angers 01, France
[2] INRA, UR4 P3F, Equipe Ecophysiol Plantes Fourrageres, F-86600 Lusignan, France
关键词
Turbid medium-based models; functional-structural plant models; light interception efficiency; light partitioning; intercropping systems; grass-legume mixtures; canopy structure; Festuca arundinacea; Medicago sativa; Pisum sativum; Trifolium repens; Triticum aestivum; RADIATION INTERCEPTION; THEORETICAL-ANALYSIS; GAP FRACTION; MODEL; SIMULATION; CANOPY;
D O I
10.1093/aob/mcr199
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
Background and Aims Most studies dealing with light partitioning in intercropping systems have used statistical models based on the turbid medium approach, thus assuming homogeneous canopies. However, these models could not be directly validated although spatial heterogeneities could arise in such canopies. The aim of the present study was to assess the ability of the turbid medium approach to accurately estimate light partitioning within grass-legume mixed canopies. Methods Three contrasted mixtures of wheat-pea,tall fescue-alfalfa and tall fescue-clover were sown according to various patterns and densities. Three-dimensional plant mock-ups were derived from magnetic digitizations carried out at different stages of development. The benchmarks for light interception efficiency (LIE) estimates were provided by the combination of a light projective model and plant mock-ups, which also provided the inputs of a turbid medium model (SIRASCA), i.e. leaf area index and inclination. SIRASCA was set to gradually account for vertical heterogeneity of the foliage, i.e. the canopy was described as one, two or ten horizontal layers of leaves. Key Results Mixtures exhibited various and heterogeneous profiles of foliar distribution, leaf inclination and component species height. Nevertheless, most of the LIE was satisfactorily predicted by SIRASCA. Biased estimations were, however, observed for (1) grass species and (2) tall fescue-alfalfa mixtures grown at high density. Most of the discrepancies were due to vertical heterogeneities and were corrected by increasing the vertical description of canopies although, in practice, this would require time-consuming measurements. Conclusions The turbid medium analogy could be successfully used in a wide range of canopies. However, a more detailed description of the canopy is required for mixtures exhibiting vertical stratifications and inter-/intra-species foliage overlapping. Architectural models remain a relevant tool for studying light partitioning in intercropping systems that exhibit strong vertical heterogeneities. Moreover, these models offer the possibility to integrate the effects of microclimate variations on plant growth.
引用
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页码:1013 / 1024
页数:12
相关论文
共 52 条
  • [1] Adam B., 2002, VegeSTAR-Software to Compute Light Interception and Canopy Photosynthesis from Images of 3D Digitised Plants
  • [2] ADAM B, 1999, 3A SOFTWARE ACQUISIT
  • [3] EVALUATION OF STRUCTURE DESCRIPTION REQUIREMENTS FOR PREDICTING GAP FRACTION OF VEGETATION CANOPIES
    ANDRIEU, B
    SINOQUET, H
    [J]. AGRICULTURAL AND FOREST METEOROLOGY, 1993, 65 (3-4) : 207 - 227
  • [4] [Anonymous], [No title captured]
  • [5] Radiation interception and use by maize/peanut intercrop canopy
    Awal, M. A.
    Koshi, H.
    Ikeda, T.
    [J]. AGRICULTURAL AND FOREST METEOROLOGY, 2006, 139 (1-2) : 74 - 83
  • [6] Chamblee D. S., 1988, Alfalfa and alfalfa improvement, P439
  • [7] Phylloclimate or the climate perceived by individual plant organs: What is it? How to model it? What for?
    Chelle, M
    [J]. NEW PHYTOLOGIST, 2005, 166 (03) : 781 - 790
  • [8] Radiative models for architectural modeling
    Chelle, M
    Andrieu, B
    [J]. AGRONOMIE, 1999, 19 (3-4): : 225 - 240
  • [9] MEASUREMENT OF GAP FRACTION OF FRACTAL GENERATED CANOPIES USING DIGITALIZED IMAGE-ANALYSIS
    CHEN, SG
    IMPENS, I
    CEULEMANS, R
    KOCKELBERGH, F
    [J]. AGRICULTURAL AND FOREST METEOROLOGY, 1993, 65 (3-4) : 245 - 259
  • [10] A canopy architectural model to study the competitive ability of chickpea with sowthistle
    Cici, S-Zahra-Hosseini
    Adkins, Steve
    Hanan, Jim
    [J]. ANNALS OF BOTANY, 2008, 101 (09) : 1311 - 1318