Landuse and landcover change assessment in the Upper Runde sub-catchment, Zimbabwe and possible impacts on reservoir sedimentation

Kusena, Winmore; Chemura, Abel; Dube, Timothy; Nicolau, Melanie; Marambanyika, Thomas

doi:10.1016/j.pce.2021.103105

Cited by 5 publications

(3 citation statements)

References 41 publications

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“…Vegetation cover was stable within the National Park but in adjacent lands forest cover actually increased by approximately 7% which the authors attribute to agricultural land being left fallow and regenerating as people left the country in response to the FTLRP. A concern with tree loss is the associated increase in soil erosion and sediment yield, as documented by Kusena et al [36] in the Upper Runde subcatchment.…”

Section: Discussionmentioning

confidence: 97%

Assessing Trends in Tree Cover, Wildfire and Population Growth in Zimbabwe since 2000

Underwood,

Hollander,

Hahn

2024

Land

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Zimbabwe’s woodland and forests have experienced substantial change over the last two decades. In this study, our objective was to assess national-scale spatio-temporal changes in tree loss, wildfire, and population growth since 2000 using global data. Our results showed rates of tree loss were highest in the urbanized Harare and Bulawayo provinces between 2000–2004, followed by Masvingo and Manicaland provinces. We found agricultural versus non-agricultural land type classes had higher tree loss, with the highest rates in small resettlement farms (‘A1’ farms, averaging 5 ha in size) between 2000–2008. The findings from our analysis of wildfire showed burning peaked in 2010, impacting 12% of the country. In the peak fire years of 2008–2012, 30% of A2 self-contained resettlement farms (‘A2’ farms, averaging 318 ha in size) burned, along with 19% of A1 resettlement farms. Analysis of global population data showed increases across all provinces, particularly in large-scale commercial farming areas, with gradual increases seen in A1 and A2 farms. Understanding the trends over two decades and the patterns in three key pressures—tree loss, population change, and fire—provides an important contribution to help guide regional assistance efforts in Zimbabwe.

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Section: Discussionmentioning

confidence: 97%

Assessing Trends in Tree Cover, Wildfire and Population Growth in Zimbabwe since 2000

Underwood,

Hollander,

Hahn

2024

Land

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“…Hal ini karena lahan tegal memiliki kerapatan antar tanaman yang kurang rapat sehingga tanah mudah dihancurkan oleh daya perusak hujan (Sitorus et al, 2023). Disamping itu, perubahan tutupan lahan dari hutan dan padang rumput menjadi lahan pertanian dan tegalan menyebabkan endapan sedimen sebesar 6272 mg L -1 dari maksimum beban sedimen yang diharapkan sebesar 3.000 mg L -1 (Kusena et al, 2022). Sedimen yang terkikis ini terbawa ke aliran sungai, menurunkan kualitas air, menyumbat saluran air, dan menggangu kehidupan akuatik.…”

Section: Kondisi Indikator Kesehatan Hidrologi Dasunclassified

Analisis Hubungan Tutupan Lahan Dan Indikator Kesehatan Hidrologi Das Rejoso, Jawa Timur

Wariunsora,

Kusuma,

Suprayogo

2024

JTSL

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With increasing concerns regarding water resource management and environmental sustainability, understanding land use change and the hydrological health of watersheds is critical for informed decision-making. This study aimed to explore the effect of land use changes on hydrological health resilience in the Rejoso watershed, East Java, using remote sensing techniques and geographic information system tools to characterize the various land cover types. Landsat ETM 7+ satellite imagery was used to describe land cover classes. Hydrological health indicators such as water transmission, water availability during the dry season, and peak rainfall buffer events were systematically analyzed in relation to land cover change conditions. Regression statistical methods were used to measure the impact of land cover changes on hydrological parameters. The study results showed that the area of forest land in the Rejoso watershed tended to increase from 2011 to 2021; on the other hand, the area of agroforestry land tended to decrease along with the increase in upland land. In general, the hydrological health of the Rejoso watershed is decreasing from year to year. The increase in forest area, agroforestry, settlements, and ponds provides a positive response to the hydrological health of the watershed. On the other hand, the increase in moorland and rice fields has a negative impact on the hydrological health of the watershed.

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“…Si bien la capacidad bruta de almacenamiento de los embalses a nivel mundial es actualmente de 6.1×10 12 m 3 , aproximadamente 2×10 12 m 3 (32.8%) de esta capacidad se ha perdido por sedimentación (Ren et al, 2021). Se estima que, anualmente, casi el uno por ciento de la capacidad de almacenamiento de los embalses a nivel mundial se pierde debido a la sedimentación (Ghassemi y White, 2007;Kusena et al, 2022). Sin tener en consideración los nuevos proyectos de grandes presas, Sumi (2018) estimó que la mitad de la capacidad mundial de almacenamiento de los embalses se perdería para el año 2050.…”

Section: Introductionunclassified

Estado trófico y características morfométricas como factores reguladores de las tasas de sedimentación en embalses mediterráneos

2022

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En este trabajo se ha medido la tasa de sedimentación de material particulado, como peso seco (DW) así como de carbono (C), nitrógeno (N) y fósforo (P) en seis embalses mediterráneos de características muy contrastadas. Nuestro principal objetivo ha sido determinar: (1) las relaciones entre: DW, la razón molar (C:N:P) del seston, el fósforo total (PT), la razón entre el área de la cuenca de captación y el área superficial de los embalses (Ac:Ar) y la resuspensión del sedimento (razón dinámica); y (2) la relación entre la fracción de la producción primaria que sedimenta desde la zona trófica (razón de exportación) y el estado trófico. Los resultados muestran relaciones positivas y significativas de DW con Ac:Ar, y relaciones positivas pero no significativas con PT y con la razón dinámica. La estequiometría sestónica mostró grandes diferencias con la relación de Redfield. Finalmente, la razón de exportación y el estado trófico muestra una relación inversa, aunque no significativa, indicando posiblemente que el plancton de los embalses menos eutrofizados es menos eficiente reteniendo nutrientes en la columna de agua.

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Landuse and landcover change assessment in the Upper Runde sub-catchment, Zimbabwe and possible impacts on reservoir sedimentation

Cited by 5 publications

References 41 publications

Assessing Trends in Tree Cover, Wildfire and Population Growth in Zimbabwe since 2000

Assessing Trends in Tree Cover, Wildfire and Population Growth in Zimbabwe since 2000

Analisis Hubungan Tutupan Lahan Dan Indikator Kesehatan Hidrologi Das Rejoso, Jawa Timur

Estado trófico y características morfométricas como factores reguladores de las tasas de sedimentación en embalses mediterráneos

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