The effect of the size of particles on mineralization of Oxycaryum cubense (Poepp. & Kunth) Lye

Brazilian Journal of Biology

I. Bianchini Jr.¹  M. B. Cunha-santino¹ 

[1] ,Universidade Federal de São CarlosSão Carlos SP ,Brasil

关键词: mineralization;    Oxycaryum cubense;    aquatic macrophytes;    detritus size;    mineralização;    Oxycaryum cubense;    macrófitas aquáticas;    tamanho do detrito;   

DOI  :  10.1590/S1519-69842006000400008

来源: SciELO

【 摘 要 】

Assays were carried out to evaluate effects of detritus size on the mineralization of an aquatic macrophyte, the Oxycaryum cubense. Samples of plant and water were collected from an oxbow lake, the Infernão lagoon (21° 35' S and 47° 51' W) located at Mogi Guaçu river floodplain. The plants were taken to the laboratory, washed under tap water, dried (50 °C) and fractioned into six groups according to their size, viz. 100, 10, 1.13, 0.78, 0.61 and 0.25 mm. Decomposition chambers were prepared by adding 1.0 g of plant fragments to 4.1 L of water lagoon. In sequence, the incubations were aerated and the concentrations of dissolved oxygen, the pH, the electric conductivity and the temperature were monitored for 120 days. The occurrence of anaerobic processes was avoided by reoxygenating the solutions. The experimental results were fitted to a first order kinetic model and the consumption of dissolved oxygen from mineralization processes was obtained. The physical process of fragmentation of O. cubense detritus is unlikely to promote the consumption of higher quantities of dissolved oxygen in mineralization processes meaning that fragmentation should not interfere in the balance of DO in this aquatic system, however fragmentation processes favored the acidification and increased the liberation of dissolved ions from the Infernão lagoon.

【 授权许可】

CC BY   
 All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License