Changes in Soil Organic Carbon Stock Under Different Land Use Types in Semiarid Borana Rangelands: Implications for CO2 Emission Mitigation in the Rangelands

Shiferaw, Addis; Yimer, Fantaw; Tuffa, Samuel

doi:10.35248/2593-9173.19.10.254

“…Te possible reason for the low BD at the higher elevation was associated with high organic carbon, organic matter, and higher clay content [65,66]. According to the study reported by Shiferaw et al [67], the low BD at a higher elevation resulted from fewer disturbances, higher litterfall, and organic matter accumulation, while the highest BD value recorded at the lower elevations was due to high sand content and compaction of soil by grazing [37,66,68,69]. Organic matter increased soil porosity and lowered bulk density [37,70].…”

Section: Soil Texture (Sand Silt and Clay Proportions (%))mentioning

confidence: 94%

Impact of Elevation Change on the Physicochemical Properties of Forest Soil in South Omo Zone, Southern Ethiopia

Hailemariam

¹

,

Woldu

²

,

Asfaw

³

et al. 2023

Applied and Environmental Soil Science

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The assessment of the distribution of soil physicochemical properties provides basic information for our understanding of the soils to grow crops and sustain forests and grasslands. The changes in soil physicochemical properties along elevational gradients were studied in a less accessible Sida Forest, southern Ethiopia. Hence, the present study was conducted to assess the distribution of soil physicochemical properties along the elevational gradients and to evaluate the fertility status of the soil. Data on soil physicochemical properties were collected from five points (four from each corner and one from the center) of the main plot. A pit of 20 cm × 20 cm was dug at a depth of 0–30 cm and a kilogram of composite soil samples was brought to the Wolkite Soil Testing Laboratory for physicochemical analysis. The results revealed that the physicochemical properties of the collected soil samples show a significant correlation with elevation changes. Sand had a significantly negative correlation and variation with elevation; it decreases as elevation increases with the rate of correlation (r = −0.44 ∗ ∗ , P ≤ 0.001 ). However, silt had a nonsignificantly positive (r = 0.20, P < 0.079 ) correlation to the elevation, while clay had a significantly positive correlation to elevation, and it increases as elevation increases with the rate of correlation coefficient (r = 0.40 ∗ ∗ , P ≤ 0.001 ). Soil OC, OM, TN, CEC, and exchangeable Mg2+ had significant positive correlation to the elevation; they increase as elevation increases with the rate of correlation coefficient (r = 0.42 ∗ ∗ , P ≤ 0.001 ), (r = 0.41 ∗ ∗ , P ≤ 0.001 ), (r = 0.44 ∗ ∗ , P ≤ 0.001 ), (r = 0.34 ∗ ∗ , P < 0.002 ), and (r = 0.27 ∗ , P < 0.014 ), respectively. While BD, pH, EC, Av. P, exchangeable Ca2+, and exchangeable K+ had a nonsignificant negative correlation to the elevation, they decrease as elevation increases with the rate of correlation (r = −0.70 ∗ ∗ , P < 0.134 ), (r = −0.20, P < 0.075 ), (r = −0.05, P < 0.683 ), (r = −0.04, P < 0.701 ), (r = −0.04, P < 0.693 ), and (r = −0.053, P < 0.693 ), respectively. This study attempted to provide information on the impact of elevation on soil’s physicochemical properties. Given that, the soil’s physicochemical properties exhibit variation with elevation changes.

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“…Indeed, the current results agree on the relationship between HC soil type biomass and the SOC content found in the same soil type. Moreover, good basal cover and high biomass of the rangeland will promote more storage of SOC ( Shiferaw, Yimer & Tuffa, 2019 ).…”

Section: Discussionmentioning

confidence: 99%

Physical and chemical properties of the soils in selected communal properties associations of South Africa

Ntalo

¹

,

Ravhuhali

²

,

Moyo³

et al. 2022

PeerJ

2

0

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Communal Property Associations (CPAs) rangeland users need more knowledge on the state of their respective grazing lands and also the interaction of soil properties with grazing management implemented. This study aimed to investigate the effect grazing has on the physical and chemical properties of four different soil types found in selected CPAs of the Bela-Bela municipality, they are as follows: Mawela (Hutton-clay loam: HCL), Bela-Bela (Hutton-clay: HC), Moretele (Hutton-loamy sand: HLS) and Ramorula (Ecca sand-clay loam: ESCL).The macro and micro minerals, pH, nitrate-nitrogen, ammonium-nitrogen, organic carbon, soil particle size distribution, acidity and resistance were all measured. All data were subjected to two-way factorial analysis of variance (SAS, 2010). The topsoil was sampled at a depth of 300 mm at an interval of 100 m (100 and 200 m) from the same transect used for woody species data collection resulting in a total of 18 samples per CPA. In each CPA, three camps were selected. In each camp, three transects 200 m apart at the length of 200 m were set. In each transect, soils were drawn at 0, 100 and 200 m making a total of nine soil samples per each camp. The highest (P < 0.05) pH (7.14) recorded on the sub-soil was in HLS. Nitrate nitrogen (2.4 mg/kg) concentration on the topsoil was high (P < 0.05) in HC soil type. Soil organic carbon for both topsoil (0.66%) and subsoil (0.41%) was significantly lower (P < 0.05) in HLS soil type and ESCL soil type respectively. Phosphorus concentration was significantly high (P < 0.05) in ESCL soil type for both topsoil (12.86 mg/kg) and sub-soil (1.59 mg/kg). Iron concentration was high in both topsoil (11.8 mg/kg) and sub-soil (7.3 mg/kg) in ESCL soil type. Sub-soil manganese concentration was found to be higher (P < 0.05) in ESCL soil type (7.58 mg/kg). Soil resistance (2880 Ω ) measured in topsoil was high (P < 0.05) in HCL soil type compared to other soil types. Moreover, for the sub-soil the highest (P < 0.05) resistance (least salts) (3640 Ω) was recorded in ESCL soil type. For most of the soil types, the mineral concentration was higher in topsoil than in sub-soil, this trend explains that the uptake of these minerals by plants took place due to the inconsistencies of grazing management employed in these selected CPA farms. It is of colossal significance to properly manage rangelands, to allow a fair-to-good herbaceous layer in the presence of minerals in the soils and farmer should prioritize having enclosures and keeping N-fixing tree species in the rangelands to achieve the above mentioned conditions.

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“…This tilling could remove the protective residues from the soil, which makes it prone to anthropogenic and natural forces (Gebresamuel et al 2020). Low soil disturbance (Shiferaw et al 2019) in lower horizons in grasslands, woodlands, and bare land could have contributed to their homogeneity in bulk density. Lower bulk densities in other land uses at the lower horizon than farmlands could be due to no-tillage and improved microporosity (Kurgat, 2011) due to microclimate in woodland and grasslands and aeration by termites in bare lands.…”

Section: The Impact Of Land Use and Depth On Soil Bulk Densitymentioning

confidence: 99%

“…Due to government policies on agricultural diversification, population pressure, sedentarization policies (Wurzinger et al, 2009), and frequent animal diseases, land tilling, crop cultivation practices have been intensified in Sanga rangeland. This practice could have increased the net loss of carbon in the soil to the atmosphere since converting grassland into farmland can elevate atmospheric carbon dioxide (Shiferaw et al, 2019). These practices threaten the rangeland ecosystems that support pastoralists' livelihoods (Shiferaw et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

“…This practice could have increased the net loss of carbon in the soil to the atmosphere since converting grassland into farmland can elevate atmospheric carbon dioxide (Shiferaw et al, 2019). These practices threaten the rangeland ecosystems that support pastoralists' livelihoods (Shiferaw et al, 2019). Agricultural practices affect SOC content, particularly on topsoil, by directly altering the carbon inputs and environmental modification for microbes .…”

Section: Introductionmentioning

confidence: 99%

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Land use and land cover change influence on soil organic carbon content for a pastoral area: use of geographical information system

Shadrack M. NJAGI,

Julius Lejju,

John Bosco Nkurunungi

2022

EAJSTI

0

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Data on land use and cover change and soil organic carbon (SOC) in rangelands are essential. This is because rangelands ecosystems are fragile, and poor land-use practices can significantly threaten their sustainability by depleting SOC and increasing atmospheric carbon dioxide. This study investigated soil organic carbon variations as influenced by land use/land cover changes in the unprotected area of the Sanga agropastoral ecosystem, southwestern Uganda. Landsat images provided data for land use and cover for 1987 and 2020. Soil organic carbon contents were investigated in farmland (FL), grassland (GL), woodland (WL), and bare land (BL) as control at 0-15 cm and 15-30 cm depths. Soil samples were analyzed for organic carbon and bulk density using the colorimetric and core ring methods, respectively. Total soil organic carbon content was significantly high in grassland (31.55 Mg C ha-1), p=0.005, and woodland (27.89 Mg C ha-1), p=0.028 compared to bare land (16.17 Mg C ha-1). Additionally, total soil organic carbon concentration in grassland (2.10%) was higher than SOC concentration in farmland (1.39%) p=0.001 and bare land (1.00%), p<0.001, respectively. Similarly, woodlands soil organic carbon concentration (1.98%) was higher than soil organic concentrations in bare lands, p=0.003 and farmlands, p=0.028. Bulk density was significantly different at lower horizons, with farmland having a higher bulk density than other land use types, p=0.013. Roots and litter inputs in woodlands and grasslands contributed to higher organic carbon than farmland and eroded/bare lands. Cultivation also increased the soil bulk density. This study concludes that land use and the land cover change affected soil organic carbon sequestration and bulk density. Therefore, farmers need to increase farm management practices to avoid an increase in bulk density. Further study to compare the effects of grazing intensity on SOC and modeling future SOC content in the study area is recommended.

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Changes in Soil Organic Carbon Stock Under Different Land Use Types in Semiarid Borana Rangelands: Implications for CO2 Emission Mitigation in the Rangelands

Cited by 6 publications

References 30 publications

Impact of Elevation Change on the Physicochemical Properties of Forest Soil in South Omo Zone, Southern Ethiopia

Impact of Elevation Change on the Physicochemical Properties of Forest Soil in South Omo Zone, Southern Ethiopia

Physical and chemical properties of the soils in selected communal properties associations of South Africa

Land use and land cover change influence on soil organic carbon content for a pastoral area: use of geographical information system

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