NDLI: Effet des flux d’eau sur la capacité de rétention des marais Ciranga et Kabamba, Lac Kivu, République Démocratique du Congo

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Effet des flux d’eau sur la capacité de rétention des marais Ciranga et Kabamba, Lac Kivu, République Démocratique du Congo

Content Provider	Semantic Scholar
Author	Zirirane, Dieudonné Niganda Majaliwa, Gilbert-Jackson Mwanjalolo Mujigwa, Jean Berckmans Bahananga Karume, Katcho Bagalwa, Jean Jacques Mashimango
Copyright Year	2014
Abstract	Cette etude a ete conduite en vue d’examiner l’effet des flux d’eau sur l’apport des nutriments charries par les rivieres Lwiro et Cirhanyobwa et determiner ainsi son impact sur l’efficacite de retention des polluants par les marais Ciranga et Kabamba. Les echantillons d’eaux recoltes dans les rivieres et dans les marais ont ete analyses pour l’ammonium, les nitrates, les phosphates, l’azote total et le phosphore total suivant les methodes spectroscopiques standard. Il est ressorti que les variations de l’efficacite de retention etaient fonction des rivieres, des types de nutriments et de la periode d’echantillonnage. Dans la riviere Lwiro traversant le marais Ciranga, il a ete ainsi observe une variation de la concentration en phosphore total entre 0.45 - 1.1 μmol/L et de 9.36 - 10.58 μmol/L de l’azote total. Par ailleurs, dans la riviere Cirhanyobwa traversant le marais Kabamba, la concentration en phosphore total a varie entre 0.46 - 0.5 μmol/L contre 10.17 - 23.72 μmol/L d’azote total. Une variation du potentiel de retention des nutriments (phosphore et azote) en fonction du flux d’eau dans les marais de Ciranga et de Kabamba a ete observee. Lors du flux eleve (debit eleve), une reduction significative en concentration des nutriments a ete observee dans le marais de Ciranga non anthropogenise que dans le marais de Kabamba (-66.82 μmol/L en phosphore total et -40.97 μmol/L en azote total contre -44.321 μmol/L en Phosphore et un gain de 21.885 μmol/L d’azote total). Des mesures de restauration des marais seraient d’une grande importance pour la stabilite du Lac Kivu et d’autres ecosystemes importants de la region. Mots-cles: flux, retention, nutriment, marais, lac Kivu. Effect of water discharge on pollutant retention efficiency in Ciranga and Kabamba wetlands, Lake Kivu, Democratic Republic of Congo This study was conducted to examine the effect of water discharge on nutrients transported by Lwiro and Cirhanyobwa rivers and to determine its impact of the retention efficiency of pollutants by the Ciranga and Kabamba wetlands. Ammonium, nitrate, total nitrogen, phosphate and total phosphorus were analyzed using standards spectroscopic method. Results show that variations of the pollutant retention efficiency were function of rivers, nutrients types and the sampling period. In the river Lwiro crossing Ciranga wetland, total phosphorus concentration ranged between 0.45 and 1.1 μmol/L and between 9.36 and 10.58 μmole/L of total nitrogen. Moreover, in the river Cirhanyobwa crossing the Kabamba wetland, the total phosphorus concentration varied between 0.46 to 0.5 μmol/L against 10.17 to 23.72 μmol/L of total nitrogen. Pollutant retention efficiency varied with water discharge. During the high flux (high discharge flux), significant reduction of nutrients concentration was observed in Ciranga, a no intensively used for anthropogenic activities than in Kabamba wetland which is intensively used for anthropogenic activities (-66.82 μmol/L for total phosphorus and -40.97 μmol/L for total nitrogen for Ciranga against -44.321 μmol/L of total phosphorus and a increased of 21.885 μmole/L of total nitrogen for Kabamba). In order to stabilize Lake Kivu and other important ecosystems of the region, there is need some restoration measures of wetlands. Keywords : fluxes, retention, nutrient, wetlands, lake Kivu.
Starting Page	169
Ending Page	179
Page Count	11
File Format	PDF HTM / HTML
Volume Number	10
Alternate Webpage(s)	http://www.afriquescience.info/docannexe.php?id=4394
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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