Application of the pipe model theory to non-destructive estimation of leaf biomass and leaf area of pruned agroforestry trees |
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| Authors: | P Nygren S Rebottaro R Chavarría |
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| Institution: | (1) Forestry Field Station, University of Helsinki, SF-35500 Korkeakoski, Finland;(2) Facultad de Agronomía, Catedra de Dasonomía, Universidad de Buenos Aires, Av. San Martín 4453, 1417, Capital Federal, Argentina;(3) Departmento de Investigación Forestal, Instituto Nicaragüense de Recursos Naturales y del Ambiente (IRENA), Apdo. 5123, Managua, Nicaragua |
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| Abstract: | The relationship of branch cross sectional area (CS) to leaf biomass (LM) and leaf area (LA) was studied in three agroforestry tree species,Calliandra calothyrsus Maissn.,Erythrina berteroana Urban andErythrina poeppigiana (Walpers) O.F. Cook, to develop a non-destructive method for the estimation of LM and LA for trees managed with periodic pruning. Variation in these relationships was observed according to the bifurcation level and, in theErythrina spp., by clone. All the relationships were linear except the CS-LM relation in small branches ofE. poeppigiana, where it was initially exponential. At main branch level the relationship of CS to LM and LA was linear in all cases but the regression parameter values varied between species and clones, with determination coefficient (R2) 0.88–0.99. It was concluded that the ratio of main branch CS to LM and LA can be used for non-destructive estimation of the latter variables. The method has the additional benefit that the regression parameter value reflects the allocation of dry matter within a tree and, consequently, may give indications about its possible uses in different agroforestry systems.Work carried out at the Centro Agronómico Tropical de Investigación y Enseñanza (CATIE), Turrialba, Costa Rica. |
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| Keywords: | Calliandra calothyrsus Erythrina berteroana Erythrina poeppigiana branch architecture branch cross sectional area branch diameter dry matter allocation |
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