Flooding effect on inicial growing of Tabebuia heptaphylla (Vell.) Toledo (Ipê-rosa)
Abstract
The riparian zones are any plant formations near the waterways, no matter their area or region of occurrence and its floristic composition, and so, being subject to temporary or permanent flooding. Those plants are extremely important in ecological terms, and they are essential for maintaining the water quality of rivers and ictiological fauna. Many species grow naturally in areas of riparian forest, but these plants should regularly adapt their metabolism and life cycle of changing the airway in order to support the changes between aerobic and hypoxic, or even anoxic conditions, imposed by the flooding. Despite its undeniable importance environment, the riparian zones have been suffering a strong human pressure in many areas of Brazil. This study aimed to evaluate the effect of the flood on the initial growth of Tabebuia heptaphylla (Vell). Toledo (Ipê rosa) and examine the possibility of using this kind of plant on recovery programs in the riparian zones. Therefore, the plants remained under simulated conditions of flooding for three months, when they were withdrawn the conditions of flooding and submitted to more than two months of treatment in soil in the ability of field. They were used 120 plants, divided into four treatments that included: stopped water flood (AP), with current flood water (AC), ground in the ability of field, (CC) and control with daily watering (C). Monthly were measured the height and diameter of the aerial part of the collect. At the beginning and end of the experiment were obtained from the masses of dry air and part of the root, thereby calculating the ratio of total mass and root / air part. Those results, it was found that the effect of the flood was higher in plants subjected to (AP) and (AC) conditions, where both growth of the air part as the diameter showed total and partial inhibition respectively. Both also showed zero values for the mass of the dry air part, rooting and total mass. Unlike the results described, plants subjected to treatment (C) and (CC) showed a significant increase in the figures for the growth in height, diameter and mass collect the drought. Thus, the results indicate that the species Tabebuia heptaphylla does not tolerate periods of permanent flood.
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References
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