Carbon stock potential of scattered trees on farmland along an altitudinal gradient in Tigray, Northern Ethiopia

Gebrewahid, Yikunoamlak; Gebre-Egziabhier, Tewolde-Berhan; Teka, Kassa; Birhane, Emiru

doi:10.1186/s13717-018-0152-6

Cited by 33 publications

(38 citation statements)

References 42 publications

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“…In this respect, Ethiopia is facing severe degradation in both the highlands and the lowlands. Particularly, the Ethiopian grazing land ecosystems were faced challenges of intense degradation due to deforestation, agricultural land expansion, and continuous and heavy grazing (Lemenih et al., 2005; Mengistu et al., 2005a; Gebrewahid et al., 2018). Overgrazing is one of the major factors aggravated ecosystem degradation, which causes an increase in unpalatable species by destroying the most palatable species and reduce plant cover and biomass, thereby increase erosion hazard and reduce the overall productivity of the land (O'Connor et al., 2001; Bot and Benites, 2005; Pulido et al., 2018).…”

Section: Introductionmentioning

confidence: 99%

Carbon sequestration potential of natural vegetation under grazing influence in Southern Tigray, Ethiopia: implication for climate change mitigation

Atsbha¹,

Desta

Zewdu

2019

Heliyon

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The management influence on carbon sequestration potential of different land use types are least known at the national level. This research was conducted to assess the impact of area exclusion on carbon sequestration potential in the two land use systems: protected natural vegetation (PNV) and communal grazing land (CGL). Data of vegetation, litter, and soils were collected using systematic sampling methods, laying 19 transects and 62 quadrats each with 20 m × 20 m for trees, 5 m × 5 m sub-quadrats for shrubs, and 1 m × 1m sub-quadrats for herbs/grasses, litter biomass, and soil sample. Aboveground biomass carbon (AGC), belowground biomass carbon (BGC), soil organic carbon (SOC), and total carbon stock (TC) were estimated using allometric equations. The mean difference level of carbon stocks (P < 0.05) of the two land use systems was tested through unequal variance t-test using R-software. The mean above ground and below ground carbon stock of PNV, 21.05 ton/ha, 10.39 ton/ha, was higher than CGL, 15.31 ton/ha, 7.65 ton/ha, respectively. The average values of SOC was 16.60 ton/ha from PNV and 13.76 ton/ha from CGL. The mean value of SOC was higher at the PNV than CGL and significantly different (P < 0.05). The total carbon stock estimate of PNV and CGL were 50.74 ton/ha and 37.11 ton/ha, respectively, which is significantly different (P < 0.05). We concluded that, establishment of PNV as the best practice of restoration programs through exclusion of livestock from free grazing and human interference provides cost effective mechanism that yields a high carbon sequestration potential with multiple benefits for biodiversity conservation, livelihood support, and climate change mitigation.

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Section: Introductionmentioning

confidence: 99%

Carbon sequestration potential of natural vegetation under grazing influence in Southern Tigray, Ethiopia: implication for climate change mitigation

Atsbha¹,

Desta

Zewdu

2019

Heliyon

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“…Sesame (Sesamum indicum), sorghum (Sorghum bicolor), and cotton (Gossypium) are the commonly grown cereal crops in the area. The common type of agroforestry practice noticed in the study area is parkland agroforestry that is known for retaining indigenous trees on farmlands (Gebrewahid et al 2018). The dominant tree species grown on farmlands include Pterocarpus leucens, Oxytenanthera abyssinica, Ziziphus spinachristi, Dalbergia melanoxylon, and Combretum spp.…”

Section: Study Area Descriptionmentioning

confidence: 99%

Dispersed trees on smallholder farms enhance soil fertility in semi-arid Ethiopia

et al. 2019

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Introduction: Dispersed trees such as Oxytenanthera abyssinica (A. Rich.) and Dalbergia melanoxylon (Guill. & Perr.) which are objectively maintained or planted on farmland provide a significant contribution to soil fertility improvement. However, there was no quantitative information on the level of soil nutrient additions of these trees to the soil system. Methods: This study was conducted on the farmers' fields in Kafta Humera district, Tigray region (northern Ethiopia), where mature stands of O. abyssinica and D. melanoxylon trees exist. Radial distance-based soil sampling (under the canopy, near to canopy, and far from canopy) was adopted to quantify the role of these trees on soil fertility improvement. Soil parameters tested were soil reaction (pH), total nitrogen (TN), available phosphorus (AvP), electrical conductivity (EC), cation exchange capacity (CEC), and organic carbon (OC). Results: There was a negative linear relationship between the radial distance of the O. abyssinica tree trunk and soil TN, OC, CEC, and AvP contents but not for pH. Similarly, negative linear relationship between distance from D. melanoxylon and TN, OC, and AvP was obtained. The average total nitrogen (0.26% and 0.13%), available phosphorus (7.21 ppm and 6.37 ppm), and organic carbon (1.73% and 1.02%) contents were respectively higher under the tree canopies of O. abyssinica and D. melanoxylon compared with the adjacent open canopies. The amount of soil OC, TN, AvP, and CEC under O. abyssinica tree species was also significantly higher by 69%, 100%, 13%, and 42% compared to that of D. melanoxylon tree species. However, the amount of EC and soil pH was significantly lower by 57% and 19%, respectively. Conclusion: In general, O. abyssinica and D. melanoxylon added a significant amount of nutrients to the soil. Thus, retaining these important tree species on farmland played a positive role in replenishing soil fertility for resource-constrained households so as to reduce chemical fertilizer amendments.

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“…The increasing tendency of carbon density with decreasing altitude may be because of soil leaching, better mineralization and stabilization of SOC at lower altitudes(Mawer et al, 2018). The range of SOC that in the study that was carried out in Tigray, was 2.28 and 40.5 Mg C ha −1(Gebrewahid et al, 2018). The mean soil organic carbon of PLAP in the study area was 51.31 Mg C ha −1 .…”

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confidence: 93%

Assessment of Carbon Stock Potential of Parkland Agroforestry Practice: The Case of Minjar Shenkora; North Shewa, Ethiopia

Eshetu¹,

Muhie²,

Mulu³

2020

Preprint

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Background: The anthropogenic global climate change has negative impacts on various sectors and communities who particularly rely on rain-fed agriculture. Parkland agroforestry practice can contribute to mitigate and adapt to the forthcoming climate change through carbon sequestration. However, empirical studies on carbon stocks potential of parklands agroforestry practices are scarce in different localities. This study assessed carbon stocks of parkland agroforestry practice at Minjar Shenkora woreda. Methodology: By using two-stage stratified random sampling technique, 4 kebeles from two agro ecology were selected and 8 farms/plots/ of 40 m*40 m sample size were selected from each kebele for the vegetation inventory. Tree species-specific allometric equations were used to determine carbon stock potential of parkland agroforestry practice. Results: The result reveal that, AGC, BGC, SOC and Total Carbon have significant variation (p<0.05) across kebeles. The mean total carbon stock of Bolo Giorgis, Bolo Slase, Agirat and Korma Agere is 48.87 Mg C ha-1, 58.21 Mg C ha-1, 57.81 Mg C ha-1and 73.71 Mg C ha-1; respectively. On average, carbon stock of parklands practice in Minjar shenkora was 59.65 Mg C ha-1. Conclusions: The parkland agroforestry practice has a large potential to deliver regulating ecosystem services like opportunities to mitigate the impending climate-changing through carbon sequestration and increasing the resilience of the agricultural system at Minjar shenkora woreda. To enhance the multiple ecosystem services of the parkland agroforestry practices in sustainable way: local by-laws should be strengthened to avoid illegal tree cutting and free grazing.

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Carbon stock potential of scattered trees on farmland along an altitudinal gradient in Tigray, Northern Ethiopia

Cited by 33 publications

References 42 publications

Carbon sequestration potential of natural vegetation under grazing influence in Southern Tigray, Ethiopia: implication for climate change mitigation

Carbon sequestration potential of natural vegetation under grazing influence in Southern Tigray, Ethiopia: implication for climate change mitigation

Dispersed trees on smallholder farms enhance soil fertility in semi-arid Ethiopia

Assessment of Carbon Stock Potential of Parkland Agroforestry Practice: The Case of Minjar Shenkora; North Shewa, Ethiopia

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