Method to estimate the LAI for isolated trees and continuous canopy crops

Revista Brasileira de Engenharia Agrícola e Ambiental

Coelho Filho, Maurício A.³  Marin, Fábio R.¹  Villa-Nova, Nilson A.²  Angelocci, Luiz R.²  Righi, Ciro A.² 

[1]Embrapa Informática Agropecuária, Campinas

[2]ESALQ/USP, Piracicaba

[3]Embrapa Mandioca e Fruticultura Tropical, Cruz das Almas

关键词: Lai 2000;    luximeter;    citrus;    Hevea spp    INTRODUÇÃOO conhecimento da estrutura de um dossel vegetativo é importante para o maior entendimento das repostas vegetais a estímulos ambientais pois as inter-relações existentes entre vegetal e ambiente são governadas por essa variável (Norman & Campbell;    1989);   

DOI  :  10.1590/S1415-43662012000500009

学科分类：农业科学（综合）

来源: Universidade Federal de Campina Grande * Centro de Ciencias e Tecnologia

【 摘 要 】

This paper aimed to describe and evaluate a low-cost simplified method (IAF-LUX method) for leaf area index (LAI) estimation, in comparison with well-tested commercial equipment (LAI-2000, Li-Cor®), being both applied for a rubber tree plantation and for a 'Tahiti' acid lime orchard. Later, the results of the both methods were also compared with destructive measurements of leaf area carried out in other 'Tahiti' acid lime adult tree. Considering LAI-2000 as reference, the proposed IAF-LUX method showed deviations of 7.4% for rubber tree and 3.6% for acid lime 'Tahiti'. Comparing the IAF-LUX with destructive measurements, a deviation of 5.0% was observed in acid lime, while LAI-2000 showed deviation of 7.0%. Based on these results, it is concluded that the IAF-LUX method may be used for determining leaf area in the two species, replacing advantageously the other destructive or non-destructive techniques because it is of low cost, easily operated and non-destructive procedure.

【 授权许可】

CC BY-NC