Measurement and simulation of solar radiation availability in relation to the growth of coffee plants in an agroforestry system with rubber trees

Revista Árvore

Ciro Abbud Righi²  Marcos Silveira Bernardes¹  Aureny Maria Pereira Lunz¹  Carlos Rodrigues Pereira¹  Durval Dourado Neto¹  José Laercio Favarin¹ 

[1] ,Universidade de São Paulo Centro de Energia Nuclear na Agricultura

关键词: Solar radiation;    attenuation;    coffee;    rubber tree;    model;    Radiação solar;    atenuação;    café;    seringueira;    modelo;   

DOI  :  10.1590/S0100-67622007000200002

来源: SciELO

【 摘 要 】

Solar radiation is an important factor for plant growth, being its availability to understory crops strongly modified by trees in an Agroforestry System (AFS). Coffee trees (Coffea arabica - cv. Obatã IAC 1669-20) were planted at a 3.4 x 0.9 m spacing inside and aside rows of monocrops of 12 year-old rubber trees (Hevea spp.), in Piracicaba-SP, Brazil (22º42'30" S, 47º38'00" W - altitude: 546m). One-year-old coffee plants exposed to 25; 30; 35; 40; 45; 80; 90; 95 and 100% of the total solar radiation were evaluated according to its biophysical parameters of solar radiation interception and capture. The Goudriaan (1977) adapted by Bernardes et al. (1998) model for radiation attenuation fit well to the measured data. Coffee plants tolerate a decrease in solar radiation availability to 50% without undergoing a reduction on growth and LAI, which was approximately 2m².m-2 under this condition. Further reductions on the availability of solar radiation caused a reduction in LAI (1.5m².m-2), thus poor land cover and solar radiation interception, resulting in growth reduction.

【 授权许可】

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