NON-DESTRUCTIVE METHOD FOR ESTIMATING ABOVEGROUND BIOMASS OF EMERGENT AQUATIC MACROPHYTES

Laís Nunes, Antonio Camargo

Resumo


The aim of this study was to test the relationship between different morphological variables with the biomass of the emergent aquatic macrophytes Crinum americanum and Spartina alterniflora. We obtained the "individual" aboveground area and the "individual" height of the plants specimens of different sizes and development stages, collected in the Itanhaém River Estuary (SP, Brazil). The plants were dried in a laboratory oven and weighed to obtain their dry mass. Simple linear regression analysis were applied between the morphological variables and the "individual" dry mass to obtain equations and mathematical models. For C. americanum the model obtained between the biomass and aboveground fraction area showed higher adjustment than the "individual" height one. For S. alterniflora both models showed very similar adjustment values. To the development of the models involving the "individual" height we used only one morphological measure for each "individual" while for the models involving the "individual" aboveground area were necessary to obtain numerous morphological measurements by "individual". The chosen morphological variables are valuable plant traits to estimate the aboveground biomass of the emergent aquatic macrophytes C. americanum and S. alterniflora. However, considering the models adjustment and the time consuming the "individual" height is a more efficient metric to estimate the biomass for the species in question.


Palavras-chave


Dry mass; Plant traits; Morphological variables; Crinum americanum; Spartina alterniflora.

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