Evaluation of impact of land use and landscape metrics on surface water quality in the northeastern part along Lake Tanganyika, Africa
As the second deepest lake in Africa, Lake Tanganyika plays an important role in supplying fish protein for the catchment’s residents and is irreplaceable in global biodiversity. However, the lake’s water environment is threatened by socioeconomic development and rapid population growth along the la...
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| Veröffentlicht in: | Environmental science and pollution research international 2024-01, Vol.31 (5), p.8134-8149 |
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| creator | Yu, Cheng Xia, Shiyu Chen, Sofia Shuang Gao, Qun Wang, Zhaode Shen, Qiushi Kimirei, Ismael Aaron |
| description | As the second deepest lake in Africa, Lake Tanganyika plays an important role in supplying fish protein for the catchment’s residents and is irreplaceable in global biodiversity. However, the lake’s water environment is threatened by socioeconomic development and rapid population growth along the lake. This study analyzed the spatial scale effects and seasonal dependence of land use types and landscape metrics on water quality in 16 sub-basins along northeastern Lake Tanganyika at different levels of urbanization. The results revealed that land use types had a higher influence on water quality in urban areas than that in rural areas; the explanatory variance in the urban area was 0.78–0.96, while it was 0.21–0.70 in the rural area. The explanatory ability of land use types on water quality was better at the buffer scale than at the sub-watershed scale, and the 500 m buffer scale had the highest explanatory ability in the urban area and rural area both in the rainy season and dry season, and artificial surface and arable land were the main contributing factors. And this phenomenon was more obvious in dry season than in rainy season. We identified that CONTAG was the key landscape metric in urban area and was positively correlated with nutrient variables, indicating that water quality degraded in less fragmented landscapes. The sub-watershed scale had the highest explained ability, while in rural area, the 1500 m buffer scale had the highest explained ability and IJI had the highest explanatory variance, which had a negative effect on water quality. Research on the relationship between land use and water quality would help assess the water quality in the unmonitored watershed as monitoring is expensive and time-consuming in low-income area. This knowledge would provide guideline to watershed managers and policymakers to prioritize the future land use development within Lake Tanganyika basin. |
| doi_str_mv | 10.1007/s11356-023-31701-3 |
| format | Article |
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However, the lake’s water environment is threatened by socioeconomic development and rapid population growth along the lake. This study analyzed the spatial scale effects and seasonal dependence of land use types and landscape metrics on water quality in 16 sub-basins along northeastern Lake Tanganyika at different levels of urbanization. The results revealed that land use types had a higher influence on water quality in urban areas than that in rural areas; the explanatory variance in the urban area was 0.78–0.96, while it was 0.21–0.70 in the rural area. The explanatory ability of land use types on water quality was better at the buffer scale than at the sub-watershed scale, and the 500 m buffer scale had the highest explanatory ability in the urban area and rural area both in the rainy season and dry season, and artificial surface and arable land were the main contributing factors. And this phenomenon was more obvious in dry season than in rainy season. We identified that CONTAG was the key landscape metric in urban area and was positively correlated with nutrient variables, indicating that water quality degraded in less fragmented landscapes. The sub-watershed scale had the highest explained ability, while in rural area, the 1500 m buffer scale had the highest explained ability and IJI had the highest explanatory variance, which had a negative effect on water quality. Research on the relationship between land use and water quality would help assess the water quality in the unmonitored watershed as monitoring is expensive and time-consuming in low-income area. 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We identified that CONTAG was the key landscape metric in urban area and was positively correlated with nutrient variables, indicating that water quality degraded in less fragmented landscapes. The sub-watershed scale had the highest explained ability, while in rural area, the 1500 m buffer scale had the highest explained ability and IJI had the highest explanatory variance, which had a negative effect on water quality. Research on the relationship between land use and water quality would help assess the water quality in the unmonitored watershed as monitoring is expensive and time-consuming in low-income area. 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| subjects | Agricultural land Aquatic Pollution Arable land Atmospheric Protection/Air Quality Control/Air Pollution Biodiversity Buffers Dry season Earth and Environmental Science Ecotoxicology Environment Environmental Chemistry Environmental degradation Environmental Health Lakes Land use Landscape Low income areas Population growth Quality assessment Rainy season Research Article Rural areas Seasons Surface water Urban areas Urbanization Variance Waste Water Technology Water Management Water Pollution Control Water quality Water quality assessments Watershed management Watersheds |
| title | Evaluation of impact of land use and landscape metrics on surface water quality in the northeastern part along Lake Tanganyika, Africa |
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