Combretum-Terminalia vegetation accumulates more carbon stocks in the soil than the biomass along the elevation ranges of dryland ecosystem in Southern Ethiopia

Tesfaye, Musse; Negash, Mesele

doi:10.1016/j.jaridenv.2018.02.004

Cited by 10 publications

(6 citation statements)

References 38 publications

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“…The SOC (0–60 cm) to total biomass C stock ratio averaged 13.9 for the home garden, 9.2 for parkland, 3.1 for woodlot and 8.4 for boundary planting AF practices. The SOC stock to biomass C ratio in AF practices is affected by several factors including the age of the AF system that has been being practiced [ 47 ], types of tree species included and rotation age [ 12 , 35 ], soil type [ 35 ], elevation, climatic condition [ 48 , 49 ], and silvicultural management [ 45 , 50 ].…”

Section: Discussionmentioning

confidence: 99%

Tree diversity and carbon stocks in agroforestry systems in northern Ethiopia

Manaye

Tesfamariam

Tesfaye

et al. 2021

Carbon Balance Manage

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Background Agroforestry (AF) is an ancient tradition in Ethiopian dryland farming system. Several studies have examined system design, soil fertility management and system interactions, but the biodiversity and mitigation aspects of climate change have received less focus. We assessed the diversity of woody species, biomass carbon (C), and soil organic carbon (SOC) stock associated with indigenous dryland AF practices. A total of 197 smallholder farmers representing four AF practices (home garden, parkland, boundary plantation, and woodlot) from lowland, midland, and highland areas were systematically selected. The inventory of woody species was carried out on each farm's randomly formed plot. Results We identified a total of 59 woody species representing 48 genera and 32 families. Shannon diversity index (H') was highest in home garden and parkland AF, while woodlots had the highest mean total stock of biomass C (31 Mg C ha−1). C stocks for smallholding systems (total biomass C and SOC 0–60 cm) ranged from 77–135 Mg ha−1. Total biomass C stocks were significantly correlated with abundance (Spearman r = 0.333; p = 0.002) but biomass components were not significantly correlated with H'. SOC soil depth stock (0–60 cm) was positively and significantly associated with H' (Spearman r = 0.291 & 0.351; p < 0.01). Conclusions We report greater species richness in home garden and parkland AF systems than in woodlots. While parkland AF produce lower biomass and SOC stock relative to other AF systems. The strategic use of home gardens and boundary planting can improve tree diversity and carbon storage in Ethiopian dryland ecosystems.

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Section: Discussionmentioning

confidence: 99%

Tree diversity and carbon stocks in agroforestry systems in northern Ethiopia

Manaye

Tesfamariam

Tesfaye

et al. 2021

Carbon Balance Manage

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“…On the other hand, cropland at Dibatie is a new land-use type, having been converted from woodlands (Combretum-Terminalia) recently. In southern Ethiopia, [71] reported that soil under Combretum-Terminalia vegetation stored higher carbon stock than the aboveground biomass.…”

Section: Effect Of Agro-ecosystem On Soc and Tn Contents And Stocksmentioning

confidence: 99%

Effects of Land Use and Topographic Position on Soil Organic Carbon and Total Nitrogen Stocks in Different Agro-Ecosystems of the Upper Blue Nile Basin

et al. 2020

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Soil organic carbon (SOC) and total nitrogen (TN) are key ecological indicators of soil quality in a given landscape. Their status, especially in drought-prone landscapes, is associated mainly with the land-use type and topographic position. This study aimed to clarify the effect of land use and topographic position on SOC and TN stocks to further clarify the ecological processes occurring in the landscape. To analyze the status of SOC and TN, we collected 352 composite soil samples from three depths in the uppermost soil (0–50 cm) in four major land-use types (bushland, cropland, grazing land, and plantation) and three topographic positions (upper, middle, and lower) at three sites: Dibatie (lowland), Aba Gerima (midland), and Guder (highland). Both SOC and TN stocks varied significantly across the land uses, topographic positions, and agro-ecosystems. SOC and TN stocks were significantly higher in bushland (166.22 Mg ha−1) and grazing lands (13.11 Mg ha−1) at Guder. The lowest SOC and TN stocks were observed in cropland (25.97 and 2.14 Mg ha−1) at Aba Gerima, which was mainly attributed to frequent and unmanaged plowing and extensive biomass removal. Compared to other land uses, plantations exhibited lower SOC and TN stocks due to poor undergrowth and overexploitation for charcoal and firewood production. Each of the three sites showed distinct characteristics in both stocks, as indicated by variations in the C/N ratios (11–13 at Guder, 10–21 at Aba Gerima, and 15–18 at Dibatie). Overall, land use was shown to be an important factor influencing the SOC and TN stocks, both within and across agro-ecosystems, whereas the effect of topographic position was more pronounced across agro-ecosystems than within them. Specifically, Aba Gerima had lower SOC and TN stocks due to prolonged cultivation and unsustainable human activities, thus revealing the need for immediate land management interventions, particularly targeting croplands. In a heterogeneous environment such as the Upper Blue Nile basin, proper understanding of the interactions between land use and topographic position and their effect on SOC and TN stock is needed to design proper soil management practices.

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“…Selection of specific study sites Twelve years old exclosures with their adjacent DOGL as control were selected purposively. The study sites had two replications (Tesfaye and Negash 2018), with an area of 26.3 ha EXs for May Chilchalo and 12.5 ha for MekabirFenih) and adjacent DOGL (36.5 ha and 16.9 ha, respectively). Based on local informants, the study sites had existed under similar soil type, vegetation type, and topography before the establishment of EXs.…”

Section: Data Collection and Samplingmentioning

confidence: 99%

Effect of degraded land rehabilitation on carbon stocks and biodiversity in semi-arid region of Northern Ethiopia

Manaye

Negash

Alebachew

2019

Forest Science and Technology

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This study evaluated the effects of exclsoures (EXs) on restoring woody species diversity and carbon stocks over the adjacent degraded open grazing land (DOGL). Two proximate sites were purposively selected. Then, systematic sampling method was employed. A total of sixty plots were surveyed for both tree/shrub inventory and soil sampling purposes. Overall, 49 woody species belonging to 45 genera and 28 families were identified, it comprising 46 woody species in the EX and 26 woody species in the DOGL. Species richness, Shannon and Simpson diversity indices were significantly higher in the EXs than DOGL. The total carbon stock was significantly higher in EXs (61.3 Mg C ha À1 , it ranged from 54.3 to 68.3 Mg C ha À1) than DOGL (40.4 Mg C ha À1 , it ranged from 35.1 to 45.7 Mg C ha À1). The conversion of the DOGL to EXs enhanced soil organic carbon and aboveground biomass carbon stock by 38 and 197% at the age of 12 years, respectively. Woody species diversity, abundance and richness were positively correlated with biomass and soil organic carbon stocks. This study revealed that EXs assisted with enrichment planting can be considered as a viable woody species recovery and carbon sequestration strategy.

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Combretum-Terminalia vegetation accumulates more carbon stocks in the soil than the biomass along the elevation ranges of dryland ecosystem in Southern Ethiopia

Cited by 10 publications

References 38 publications

Tree diversity and carbon stocks in agroforestry systems in northern Ethiopia

Tree diversity and carbon stocks in agroforestry systems in northern Ethiopia

Effects of Land Use and Topographic Position on Soil Organic Carbon and Total Nitrogen Stocks in Different Agro-Ecosystems of the Upper Blue Nile Basin

Effect of degraded land rehabilitation on carbon stocks and biodiversity in semi-arid region of Northern Ethiopia

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