A new method for evaluating Net Aboveground Primary Production (NAPP) of Scirpus giganteus (Kunth)
In this work, we propose a new tagging technique to evaluate NAPP in Scirpus giganteus (bulrush), a species commonly found in freshwater marshes of South America. Through this method, a total mean NAPP of 1514.12 ± 305.11 g m-2 year-1 (C.V.= 20%) was obtained by a combination of tagging and harvesti...
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| Autores principales: | , , , |
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| Formato: | JOUR |
| Materias: | |
| Acceso en línea: | http://hdl.handle.net/20.500.12110/paper_02775212_v25_n1_p228_Pratolongo |
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| Sumario: | In this work, we propose a new tagging technique to evaluate NAPP in Scirpus giganteus (bulrush), a species commonly found in freshwater marshes of South America. Through this method, a total mean NAPP of 1514.12 ± 305.11 g m-2 year-1 (C.V.= 20%) was obtained by a combination of tagging and harvesting entire mats. A maximum living biomass of 1063.60 ± 362.06 g m-2 (C.V.= 34%) was registered in February (late summer), which would be the estimation of the total annual NAPP using the traditional peak standing crop method and gives an underestimation of NAPP because it neither considers mortality before the peak biomass is attained, nor does it include any production after peak. As there are no statistically significant changes in the mean living biomass on different sampling dates (df=9, F=2.22, p>0.10), which is an expected situation in a species that grows through the whole year, methods based on changes in living and dead biomass are difficult to apply. The proposed tagging method gives an estimate of NAPP for a species on which more widely used procedures cannot be applied. Moreover, the tagging technique may be applicable for a great number of emergent wetland plants showing similar growth forms. © 2005, The Society of Wetland Scientists. |
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