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| dc.contributor.author | Kebebush Mulat | |
| dc.date.accessioned | 2021-06-17T08:41:38Z | |
| dc.date.available | 2021-06-17T08:41:38Z | |
| dc.date.issued | 2021-06-17 | |
| dc.identifier.uri | http://ir.bdu.edu.et/handle/123456789/12115 | |
| dc.description.abstract | Sedimentation is a serious problem in LakeTana due to deforestation, poor soil management and improper farming techniques. Hydrological changes, trampling by human or cattle, high level of suspended solids, and increased external nutrient loading are factors that may affect either growth rate or reproductive success of macrophytes. The growth rate and mortality of Cyperus papyrus (L.) are influenced by the environmental conditions prevailing in the wetland. This study was conducted to investigate the effect of sediment loading on new shoots of papyrus, plant height, plant diameter, plant density and biomass. Knowing the growth dynamics of C. papyrus in relation to sediment depth two weeks interval measurement of cum length and girth was conducted between May and October 2020 at Bahir Dar University Maritime Academy Lake Tana Campus. Interrelationships between sediment load and new shoot, biomass, diameter and height of C. papyrus in constructed wetland 2m × 1m. Plants were provided with four sediment levels of 0 cm (no sediment added), 1cm, 5cm, 10 cm sediment per constructed wetland and replicated three times. C. papyrus was also grown experimentally under uncontrolled conditions (without a greenhouse). The plants were irrigated daily with Lake Water for six months. Growth data including shoot height, stem diameter, number of new shoots, shoot weights and root weights were recorded. The data were analyzed by analysis of variance (ANOVA) in the R and SPSS statistical packages. The sediment level significantly (P ≤ 0.05) influenced the growth parameters investigated in the treatments. There were no significant differences between 0cm, 1cm and 5cm, but the differences between 10cm varied significantly. In the different treatments, papyrus showed no significant differences in height, diameter and new shoots under different sediment levels except medium and high sediment. The high sediment treatment, on the other hand, tended to have a shorter height, small diameter and fewer new shoots at high sediment load compared to longer height, stout diameter and many new shoots under control/zero sediment. Whereas, the low and medium sediment had received medium height, diameter and new shoot development. Sediment levels did not significantly (P ≥ 0.05) influence the above and below- ground biomass production. Below ground biomass values for the control had a mean of 5063g dry weight per 2m2 and high sediment, 3191g dry weight per 2m2 constructed wetland. The aerial biomass of papyrus showed a negative response to higher sediment levels. In constructed wetland receiving low and medium sediment, the values ranged from 4890-5087g dry weight per 2m2 and wet below- ground biomass values were lower for high and medium sediment at 3800g and 6066g fresh weight per 2m2 respectively. Low sediment biomass 6266g wet weight per 2m2. Results from growth experiments showed that the values of above-and below-ground biomass for control were higher than those of high sedimentation. It was concluded that control sediment had a better potential for the growth performance of Cyperus papyrus. Generally sediment load affects the overall growth of C. papyrus. Key words; Biomass, constructed wetland, growth performance, sediment load | en_US |
| dc.language.iso | en | en_US |
| dc.subject | Fisheries and Wetlands Management | en_US |
| dc.title | AN INVESTIGATION ON IMPACT OF SEDIMENT ON CYPERUS PAPYRUS GROWTH: MICROCOSM EXPERIMENT | en_US |
| dc.type | Thesis | en_US |
