Landscape composition and configuration in the central highlands of Ethiopia

Tolessa, Terefe; Senbeta, Feyera; Kidane, Moges

doi:10.1002/ece3.2477

Cited by 56 publications

(24 citation statements)

References 67 publications

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“…This is because the growing pattern of land use is reflected by a large number of patches due to the diversification of land use activities within a given area. Based on this study results, it shows an agreement with the findings of Singh et al (2014) and Tolessa et al (2016). These study and some previous study results related to land use changes therefore proved the capability of remote sensing and GIS to quantify changes in natural resource over time.…”

Section: Fragmentation Analysissupporting

confidence: 89%

“…The study of LULC along with fragmentation at the landscape level can help improve understanding of the pace at which conversion of landscape elements is happening and the impacts on ecosystem services as studies of LULC are courser in nature and would not show how each land use is reducing in size, proximity and shape among other things that determine ecosystem services as result on study by Tolessa et al (2016). The study was conducted to examine composition and configuration of forested landscape in the central highlands of Ethiopia using satellite images of over a period of four decades, and FRAGSTAT raster dataset was used to analyze fragmentation.…”

Section: Introductionmentioning

confidence: 99%

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Analyzing Land Use Pattern Changes in Mukim Pengerang, Johor, Malaysia

Man

Salihin

2018

Geoplanning: Journal of Geomatics and Planning

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Urbanization and urban land-use transition have a competitive environment to ensure and provide good facilities for citizen benefit. The landscape patterns resulting from urbanization effect processes at local, regional, and global scales. Quantifying the spatiotemporal pattern of urbanization is important for understanding its ecological impacts and can provide basic information for appropriate decision-making. The growth of urbanization in Mukim Pengerang, Johor, has undergone rapid changes in agriculture, settlements, townships and various activities. The changes of land use take place in Mukim Pengerang due to the rapid economic development, especially in industrializations which are Refinery and Petrochemical Integrated Development (RAPID) project and Pengerang Integrated Petroleum Complex (PIPC). The industrialization boosts the growth in land property and commercial which progressing in rapid development since the year 2012, in resulting whether it can give good, bad or both impact to the human and surrounding. Therefore, the main aim of this paper is to quantify the changes in landscape pattern or land use pattern between the year 2008 and 2017 occurred in Mukim Pengerang. In monitoring the spatial pattern changes, and the changes of landscape structure, the metrics landscape were analyzed with determination of the Shanon Diversity Index (SHDI), the number of patches (NP), Edge Density (ED) and Total Edge (TE) in the period of 8 years. The results show that the changes occurred with the three types of land use showed significant changes in the types of land use which are forest, agricultural and built-up area. The result of SHDI analysis shows the increment value between the year 2008 and 2017. This situation illustrates that the higher value of SHDI for an area, resulting in the higher level of land use. This is because the growing pattern of land use is reflected by a large number of patches due to the diversification of land use activities in the area. As a result, from the metrics statistics test verifies there was a significant change in land use that took place within 8 years.

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Section: Fragmentation Analysissupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Analyzing Land Use Pattern Changes in Mukim Pengerang, Johor, Malaysia

Man

Salihin

2018

Geoplanning: Journal of Geomatics and Planning

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“…Riparian forest grids for each sampling site were extracted at three riparian scales, and then the selected fragmentation metrics were computed using FRAGSTATS 4.3, a spatial pattern metrics computing program [94]. The pattern metrics selected to quantify the degree of forest fragmentation included the largest patch index (LPI), the number of patches (NP), the proportion of forest (PLAND), and the division index (DI) at the class level [95][96][97][98][99][100].…”

Section: Measuring Forest Fragmentationmentioning

confidence: 99%

Multi-Scale Assessment of Relationships between Fragmentation of Riparian Forests and Biological Conditions in Streams

2019

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Due to anthropogenic activities within watersheds and riparian areas, stream water quality and ecological communities have been significantly affected by degradation of watershed and stream environments. One critical indicator of anthropogenic activities within watersheds and riparian areas is forest fragmentation, which has been directly linked to poor water quality and ecosystem health in streams. However, the true nature of the relationship between forest fragmentation and stream ecosystem health has not been fully elucidated due to its complex underlying mechanism. The purpose of this study was to examine the relationships of riparian fragmented forest with biological indicators including diatoms, macroinvertebrates, and fish. In addition, we investigated variations in these relationships over multiple riparian scales. Fragmentation metrics, including the number of forest patches (NP), proportion of riparian forest (PLAND), largest riparian forest patch ratio (LPI), and spatial proximity of riparian forest patches (DIVISION), were used to quantify the degree of fragmentation of riparian forests, and the trophic diatom index (TDI), benthic macroinvertebrates index (BMI), and fish assessment index (FAI) were used to represent the biological condition of diatoms, macroinvertebrates, and fish in streams. PLAND and LPI showed positive relationships with TDI, BMI, and FAI, whereas NP and DIVISION were negatively associated with biological indicators at multiple scales. Biological conditions in streams were clearly better when riparian forests were less fragmented. The relationships of NP and PLAND with biological indicators were stronger at a larger riparian scale, whereas relationships of LPI and DIVISION with biological indicators were weaker at a large scale. These results suggest that a much larger spatial range of riparian forests should be considered in forest management and restoration to enhance the biological condition of streams.

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“…The variation in soil properties particularly SOC and TN could be related to the levels of disturbances, and such level of disturbances is very difficult to estimate as each fragments separated from the continuous forest of Jibat and Chillimo took place at different period of time with various levels of interferences. What we surely know from our observation during data collection and LU/LC analysis is that these forest fragments were slowly separated from the continuous forests within four to five decades (Tolessa et al 2016;Tolessa et al 2017) and the open access nature for cattle grazing, firewood collection, and timber extraction made these fragments poorly stocked. So, forest degradation affected SOC and TN within the soils although we found difference between fragments in terms of their soil properties.…”

Section: Soc and Tn Stocks For Different Fragmentsmentioning

confidence: 99%

The extent of soil organic carbon and total nitrogen in forest fragments of the central highlands of Ethiopia

Tolessa

Senbeta

2018

j ecology environ

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Background: Deforestation and degradation are currently affecting the ecosystem services of forests. Among the ecosystem services affected by deforestation and degradation are the amount of soil organic carbon (SOC) and total nitrogen (TN) stored in forest soils which have greater impacts in global climate change. This study aimed at examining the amount of SOC and TN in the forest fragments which were separated from the continuous tracts of forests of Jibat and Chillimo through fragmentation processes over four decades. Methods: We have sampled soils from 15 forest fragments of Chillimo and Jibat in the central highlands of Ethiopia. The soil samples obtained in two separate soil depths (0-30 and 30-60 cm) were bulked, dried, and sieved for analysis. Results: Our results have shown that the two sites (Jibat and Chillimo forest fragments) differed in their SOC and TN contents. While the values for Jibat were found to be 29.89 Mg/ha of SOC and 2.84 Mg/ha for TN, it was 14. 06 Mg/ha of SOC and 1.40 Mg/ha for TN for Chillimo. When all forest fragment soil samples were bulked together, Jibat site had twice the value of SOC and TN than Chillimo. When disaggregated on the basis of each fragments, there existed differences in SOC (1.86 Mg/ha and 42.15 Mg/ha) and TN (0.24 Mg/ha and 4.23 Mg/ha) values. Among the forest fragments, fragment four (F 4) had the highest Relative Soil Improvement Index (RSII) value of 3826.82% and fragment fifteen (F 15) had the lowest RSII value (726.87%) which indicated that the former had a better quality of soil properties than the latter. Conclusion: SOC and TN differed across sampled fragments and sites. Variations in soil properties are the reflections of inherent soil parent material, aboveground vegetation, human interferences, and other physical factors. Such differences could be very important for identifying intervention measures for restoration and enhancing ecosystem services of those fragments.

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Landscape composition and configuration in the central highlands of Ethiopia

Cited by 56 publications

References 67 publications

Analyzing Land Use Pattern Changes in Mukim Pengerang, Johor, Malaysia

Analyzing Land Use Pattern Changes in Mukim Pengerang, Johor, Malaysia

Multi-Scale Assessment of Relationships between Fragmentation of Riparian Forests and Biological Conditions in Streams

The extent of soil organic carbon and total nitrogen in forest fragments of the central highlands of Ethiopia

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