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Mr. Jean de Dieu Nambajimana
Key Laboratory of Mountain Surface Processes and Ecological Regulation, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, China.

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0 Land Use Planning
0 Remote Sensing
0 Soil and water conservation
0 land use and land cover
0 Geographic Information System (GIS)

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Journal article
Published: 07 June 2021 in Atmosphere
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Adoption of crop residue amendments has been increasingly recommended as an effective management practice for mitigating greenhouse gas emissions while enhancing soil fertility, thereby increasing crop production. However, the effect of biochar and straw on nitrous oxide (N2O) and methane (CH4) emissions in soils of differing pH remains poorly understood. Three treatments (control (i.e., no amendment), maize straw, and biochar derived from maize straw) were therefore established separately in soils with different pH levels, classified as follows: acidic, neutral, and alkaline. N2O and CH4 were investigated using a static chamber–gas chromatography system during 57 days of a mesocosm study. The results showed that cumulative N2O emissions were significantly higher in acidic soils than in other experimental soils, with the values ranging from 7.48 to 11.3 kg N ha−1, while CH4 fluxes ranged from 0.060 to 0.089 kg C ha−1, with inconclusive results. However, a weak negative correlation was observed between log N2O and log NO3-N in acidic soil with either biochar or straw, while the same parameters with CH4 showed a moderate negative correlation, suggesting a likelihood that these amendments could mitigate GHGs as a result of the NO3-N increase in acidic soils. It is also possible, given the alkaline nature of the biochar, that incorporation had a significant buffer effect on soil acidity, effectively increasing soil pH by >0.5 pH units. Our findings suggest that for the rates of application for biochar and straw used in this study, the magnitude of reductions in the emissions of N2O and CH4 are dependent in part on initial soil pH.

ACS Style

Tite Ntacyabukura; Ernest Uwiringiyimana; Minghua Zhou; Bowen Zhang; Bo Zhu; Barthelemy Harerimana; Jean Nambajimana; Gratien Nsabimana; Pascal Nsengumuremyi. Effect of Biochar and Straw Application on Nitrous Oxide and Methane Emissions from Eutric Regosols with Different pH in Sichuan Basin: A Mesocosm Study. Atmosphere 2021, 12, 729 .

AMA Style

Tite Ntacyabukura, Ernest Uwiringiyimana, Minghua Zhou, Bowen Zhang, Bo Zhu, Barthelemy Harerimana, Jean Nambajimana, Gratien Nsabimana, Pascal Nsengumuremyi. Effect of Biochar and Straw Application on Nitrous Oxide and Methane Emissions from Eutric Regosols with Different pH in Sichuan Basin: A Mesocosm Study. Atmosphere. 2021; 12 (6):729.

Chicago/Turabian Style

Tite Ntacyabukura; Ernest Uwiringiyimana; Minghua Zhou; Bowen Zhang; Bo Zhu; Barthelemy Harerimana; Jean Nambajimana; Gratien Nsabimana; Pascal Nsengumuremyi. 2021. "Effect of Biochar and Straw Application on Nitrous Oxide and Methane Emissions from Eutric Regosols with Different pH in Sichuan Basin: A Mesocosm Study." Atmosphere 12, no. 6: 729.

Journal article
Published: 16 January 2021 in Sustainability
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The Kenya Great Rift Valley (KGRV) region unique landscape comprises of mountainous terrain, large valley-floor lakes, and agricultural lands bordered by extensive Arid and Semi-Arid Lands (ASALs). The East Africa (EA) region has received high amounts of rainfall in the recent past as evidenced by the rising lake levels in the GRV lakes. In Kenya, few studies have quantified soil loss at national scales and erosion rates information on these GRV lakes’ regional basins within the ASALs is lacking. This study used the Revised Universal Soil Loss Equation (RUSLE) model to estimate soil erosion rates between 1990 and 2015 in the Great Rift Valley region of Kenya which is approximately 84.5% ASAL. The mean erosion rates for both periods was estimated to be tolerable (6.26 t ha−1 yr−1 and 7.14 t ha−1 yr−1 in 1990 and 2015 respectively) resulting in total soil loss of 116 Mt yr−1 and 132 Mt yr−1 in 1990 and 2015 respectively. Approximately 83% and 81% of the erosive lands in KGRV fell under the low risk category (−1 yr−1) in 1990 and 2015 respectively while about 10% were classified under the top three conservation priority levels in 2015. Lake Nakuru basin had the highest erosion rate net change (4.19 t ha−1 yr−1) among the GRV lake basins with Lake Bogoria-Baringo recording annual soil loss rates >10 t ha−1 yr−1 in both years. The mountainous central parts of the KGRV with Andosol/Nitisols soils and high rainfall experienced a large change of land uses to croplands thus had highest soil loss net change (4.34 t ha−1 yr−1). In both years, forests recorded the lowest annual soil loss rates (−1 yr−1) while most of the ASAL districts presented erosion rates (−1 yr−1). Only 34% of all the protected areas were found to have erosion rates −1 yr−1 highlighting the need for effective anti-erosive measures.

ACS Style

George Watene; Lijun Yu; Yueping Nie; Jianfeng Zhu; Thomas Ngigi; Jean De Dieu Nambajimana; Benson Kenduiywo. Water Erosion Risk Assessment in the Kenya Great Rift Valley Region. Sustainability 2021, 13, 844 .

AMA Style

George Watene, Lijun Yu, Yueping Nie, Jianfeng Zhu, Thomas Ngigi, Jean De Dieu Nambajimana, Benson Kenduiywo. Water Erosion Risk Assessment in the Kenya Great Rift Valley Region. Sustainability. 2021; 13 (2):844.

Chicago/Turabian Style

George Watene; Lijun Yu; Yueping Nie; Jianfeng Zhu; Thomas Ngigi; Jean De Dieu Nambajimana; Benson Kenduiywo. 2021. "Water Erosion Risk Assessment in the Kenya Great Rift Valley Region." Sustainability 13, no. 2: 844.

Journal article
Published: 24 December 2020 in International Journal of Sediment Research
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The Three Gorges Reservoir (TGR) in China is the largest hydroelectric project in the world, but the threat of sediment affecting ecological sustainability of the reservoir is a topic of concern. Sediment particle-size distribution (PSD) is informative in understanding sediment transport dynamics and biochemical functions. It is, therefore, important to quantitatively characterize the distribution of sediment particles. In the current study, fractal theory is applied to determine the PSD of suspended sediment in the TGR. The results show that the volumetric fractal dimension (Dv) exhibits a significant seasonal difference (p < 0.05), reflecting sediment source and hydrodynamic sorting control the granularity of suspended sediment in the TGR. More specifically, suspended sediment particles are coarser in the wet season than in the dry season for the Yangtze River, and the opposite is true for the Ruxi River, an important tributary. The generalized dimension spectrum, D(q)–q, and multifractal singularity spectrum, f[α(q)]–α(q), were calculated for each suspended sediment sample. Thereafter, the parameters, D(0), D(1), D(2), α(0), Δα(q), and Δf[α(q)], were determined to characterize the PSD. As a result, the coarser suspended sediment during the wet season is characterised by a more complex PSD pattern, with a wider range of particle sizes, greater heterogeneity, and greater homogeneity of distribution over the measurement interval. However, the multifractal structure of the PSD of suspended sediment is more complex during the dry season than during the wet season, with higher local dispersion and variability. The findings of the current study highlight that multifractal analysis provides important insight for understanding the PSD of suspended sediment in the TGR.

ACS Style

Jinlin Li; Xiubin He; Jie Wei; Yuhai Bao; Qiang Tang; Jean De Dieu Nambajimana; Gratien Nsabimana; Dil Khurram. Multifractal features of the particle-size distribution of suspended sediment in the Three Gorges Reservoir, China. International Journal of Sediment Research 2020, 36, 489 -500.

AMA Style

Jinlin Li, Xiubin He, Jie Wei, Yuhai Bao, Qiang Tang, Jean De Dieu Nambajimana, Gratien Nsabimana, Dil Khurram. Multifractal features of the particle-size distribution of suspended sediment in the Three Gorges Reservoir, China. International Journal of Sediment Research. 2020; 36 (4):489-500.

Chicago/Turabian Style

Jinlin Li; Xiubin He; Jie Wei; Yuhai Bao; Qiang Tang; Jean De Dieu Nambajimana; Gratien Nsabimana; Dil Khurram. 2020. "Multifractal features of the particle-size distribution of suspended sediment in the Three Gorges Reservoir, China." International Journal of Sediment Research 36, no. 4: 489-500.

Journal article
Published: 02 November 2020 in Sustainability
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Aggregate is the basic unit of soil structure, which is crucial to the sustainability of soil system functions such as structural stability and Fertility Maintenance. Three Gorges Dam (TGD) has extensively led to a dramatic hydrological regime alteration, which may consequently affect various soil physical properties. The aim of this study was to investigate the long-run temporal variation of soil aggregate stability as induced by water-level fluctuations in the riparian zone of the Three Gorges Reservoir (TGR). Sampling plots were established along different elevations considering the interval of 5 m, starting from 150 m to 175 m. A Laser Diffraction based analysis that allows the measurement of soil aggregate stability after the removal of soil organic matter helped to particularly study the effect of external factors on soil aggregate stability of the study area. In addition, wet-sieving method considering the effect of chemical binding agents was used to quantify aggregate stability. The present results indicated a significant increase of Mean Volume Diameter, MVD (p < 0.05) within the study period. Continuous drying-wetting cycles mended soil aggregate stability with a 14.25% increase of the MVD from 2012 to 2016. In the Water-Level Fluctuation Zone (WLFZ), the lower land has predominantly contributed to the increase of soil aggregate stability compared to upper land, with an increase of 62.19% and 37.81% for MVD, 60.88% and 39.12% for D10, 95.34% and 4.66% for D90 at lower and upper elevations, respectively. Sediment deposition below 165 m has precluded a direct effect of water stress on soil aggregates, which certainly declined soil disaggregation. The removal of SOM while analyzing aggregate stability by LD may explain the contradiction between the resulted MVD, and the MWD and GMD. The increase of MWD and GMD was mainly attributed to the increase of SOM with r2 = 0.89 (p < 0.01) and r2 = 0.90 (p < 0.01), while the increase of MVD was highly predicted by the decrease of SOM with r2 = 0.88 (p < 0.01). Since this study presents a remarkable change of soil in the riparian area due to dry-wet cycles, our results may help to deeply understand the soil ecology and environmental changes in the WLFZ.

ACS Style

Gratien Nsabimana; Yuhai Bao; Xiubin He; Jean Nambajimana; Mingfeng Wang; Ling Yang; Jinlin Li; Shujuan Zhang; Dil Khurram. Impacts of Water Level Fluctuations on Soil Aggregate Stability in the Three Gorges Reservoir, China. Sustainability 2020, 12, 9107 .

AMA Style

Gratien Nsabimana, Yuhai Bao, Xiubin He, Jean Nambajimana, Mingfeng Wang, Ling Yang, Jinlin Li, Shujuan Zhang, Dil Khurram. Impacts of Water Level Fluctuations on Soil Aggregate Stability in the Three Gorges Reservoir, China. Sustainability. 2020; 12 (21):9107.

Chicago/Turabian Style

Gratien Nsabimana; Yuhai Bao; Xiubin He; Jean Nambajimana; Mingfeng Wang; Ling Yang; Jinlin Li; Shujuan Zhang; Dil Khurram. 2020. "Impacts of Water Level Fluctuations on Soil Aggregate Stability in the Three Gorges Reservoir, China." Sustainability 12, no. 21: 9107.

Journal article
Published: 17 April 2020 in Journal of Geophysical Research: Biogeosciences
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Although substantial information had been generated on the effects of land use change on soil organic carbon (SOC) and total nitrogen (TN) storage, studies are absent on multifactorial effects of land use types, land use age, and elevation on SOC and TN storage. SOC and TN were therefore investigated in 30 field sites comprising natural forests, planted forests, shrub, and grasslands. SOC and TN stocks differed and correlated significantly with land use age; the C stocks correlates significantly with land use change compared the TN stocks. However, there was no relation between the C and N stocks with elevation, implying that SOC and TN are solely dependent on land use age. SOC sequestration potentials of the sampled ecosystems were 345.86, 293.19, 266.45, and 251.23 t ha−1 for the natural forests, planted forests, shrub, and grasslands with total mean value of 289.18 t·ha−1 (1,060.42 t·ha−1 CO2−eq). A significant SOC stock loss (17.96%, 29.80%, and 37.66%) occurred in converting natural forests to planted forests, shrub, and grasslands, whereas gains (27.36%, 14.31%, and 5.71%) would occur in reconverting grassland to natural forests, planted forests, and shrublands. Therefore, the C that was lost during deforestation and conversion of natural forests into other land use types could not match the carbon gains thereafter. Our results suggest that land use change and land use age have influenced soil C and N stocks. Moreover, natural forests are better in ecological conservation and restoration of degraded lands. This study provides baseline information for C and N management in ecologically restored and degraded lands.

ACS Style

Meta Francis Justine; Kaiwen Pan; Nambajimana Jean De Dieu; Fidele Karamage; Zebene Tadesse; Bikram Pandey; Wanqin Yang; Fuzhong Wu; Olusanya Olatunji; Nirdesh Nepal; Friday Uchenna Ochege; Akash Tariq; Lin Zhang; XiaoMing Sun; Pan Kaiwen; Yang Wanqin; Wu Fuzhong; Friday Uchege. Does Land Use Age Influence Carbon Cycling in the Tibetan Plateau? Journal of Geophysical Research: Biogeosciences 2020, 125, 1 .

AMA Style

Meta Francis Justine, Kaiwen Pan, Nambajimana Jean De Dieu, Fidele Karamage, Zebene Tadesse, Bikram Pandey, Wanqin Yang, Fuzhong Wu, Olusanya Olatunji, Nirdesh Nepal, Friday Uchenna Ochege, Akash Tariq, Lin Zhang, XiaoMing Sun, Pan Kaiwen, Yang Wanqin, Wu Fuzhong, Friday Uchege. Does Land Use Age Influence Carbon Cycling in the Tibetan Plateau? Journal of Geophysical Research: Biogeosciences. 2020; 125 (4):1.

Chicago/Turabian Style

Meta Francis Justine; Kaiwen Pan; Nambajimana Jean De Dieu; Fidele Karamage; Zebene Tadesse; Bikram Pandey; Wanqin Yang; Fuzhong Wu; Olusanya Olatunji; Nirdesh Nepal; Friday Uchenna Ochege; Akash Tariq; Lin Zhang; XiaoMing Sun; Pan Kaiwen; Yang Wanqin; Wu Fuzhong; Friday Uchege. 2020. "Does Land Use Age Influence Carbon Cycling in the Tibetan Plateau?" Journal of Geophysical Research: Biogeosciences 125, no. 4: 1.

Journal article
Published: 19 December 2019 in Sustainability
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Rwanda has experienced accelerated soil erosion as a result of unsustainable human activities and changes in land use. Therefore, this study aimed at applying the RUSLE (Revised Universal Soil Loss Equation) model using GIS (Geographical Information System) and remote sensing to assess water erosion in Rwanda, focusing on the erosion-prone lands for the time span 2000 to 2015. The estimated mean annual soil losses were 48.6 t ha−1 y−1 and 39.2 t ha−1 y−1 in 2000 and 2015, respectively, resulting in total nationwide losses of approximately 110 and 89 million tons. Over the 15 years, 34.6% of the total area of evaluated LULC (land use/land cover) types have undergone changes. The highest mean soil loss of 91.6 t ha−1 y−1 occurred in the area changing from grassland to forestland (0.5%) while a mean soil loss of 10.0 t ha−1 y−1 was observed for grassland converting to cropland (4.4%). An attempt has been made to identify the embedded driving forces of soil erosion in Rwanda. As a result, we found that mean soil loss for Rwanda’s districts in 2015 was significantly correlated with poverty (r = 0.45, p = 0.013), increased use of chemical fertilizers (r = 0.77, p = 0.005), and especially was related to extreme poverty (r = 0.77, p = 0.000). The soil conservation scenario analysis for Rwanda’s cropland in 2015 revealed that terracing could reduce the soil loss by 24.8% (from 14.6 t ha−1 y−1 to 11.7 t ha−1 y−1). Most importantly, the study suggests that (1) terracing integrated with mulching and cover crops could effectively control water erosion while ameliorating soil quality and fertility, and (2) reforestation schemes targeting the rapid-growing tree species are therefore recommended as an important feature for erosion control in the study area.

ACS Style

Jean De Dieu Nambajimana; Xiubin He; Ji Zhou; Meta Francis Justine; Jinlin Li; Dil Khurram; Richard Mind’Je; Gratien Nsabimana. Land Use Change Impacts on Water Erosion in Rwanda. Sustainability 2019, 12, 50 .

AMA Style

Jean De Dieu Nambajimana, Xiubin He, Ji Zhou, Meta Francis Justine, Jinlin Li, Dil Khurram, Richard Mind’Je, Gratien Nsabimana. Land Use Change Impacts on Water Erosion in Rwanda. Sustainability. 2019; 12 (1):50.

Chicago/Turabian Style

Jean De Dieu Nambajimana; Xiubin He; Ji Zhou; Meta Francis Justine; Jinlin Li; Dil Khurram; Richard Mind’Je; Gratien Nsabimana. 2019. "Land Use Change Impacts on Water Erosion in Rwanda." Sustainability 12, no. 1: 50.

Article
Published: 01 August 2019 in Journal of Mountain Science
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The combined effect of periodic water impoundment and seasonal natural flood events has created a 30 m high water-level fluctuation zone (WLFZ) around the Three Gorges Reservoir (TGR), China, forming a unique eco-landscape. Siltation, eutrophication, enrichment of heavy metals, and methane emissions in the WLFZ have been widely associated with sediment and soil particles generated from the upstream catchment or upland slopes. However, little attention has been paid to the complexity of sediment particle-size distributions in the WLFZ. In the present study, core samples (from a 345 cm thick sediment core from the base of the WLFZ), slope transect surface samples (across/up a WLFZ slope), and along-river/longitudinal surface samples (from the reservoir reaches) were collected. Laser granulometry and a volume-based fractal model were used to reveal the characteristics of sediment particle-size distributions. Results indicate that the alternation of coarse and fine particles in the sedimentary core profile is represented as a fluctuation of low and high values of fractal dimension (D), ranging from 2.59 to 2.77. On the WLFZ slope transect, surface sediment particles coarsen with increasing elevation, sand content increases from 3.3% to 78.5%, and D decreases from 2.76 to 2.53. Longitudinally, surface sediments demonstrate a downstream-fining trend, and D increases gradually downstream. D is significantly positively correlated with the fine particle content. We conclude that D is a useful measure for evaluating sediment particle-size distribution.

ACS Style

Jin-Lin Li; Yu-Hai Bao; Jie Wei; Xiu-Bin He; Qiang Tang; Jean De Dieu Nambajimana. Fractal characterization of sediment particle size distribution in the water-level fluctuation zone of the Three Gorges Reservoir, China. Journal of Mountain Science 2019, 16, 2028 -2038.

AMA Style

Jin-Lin Li, Yu-Hai Bao, Jie Wei, Xiu-Bin He, Qiang Tang, Jean De Dieu Nambajimana. Fractal characterization of sediment particle size distribution in the water-level fluctuation zone of the Three Gorges Reservoir, China. Journal of Mountain Science. 2019; 16 (9):2028-2038.

Chicago/Turabian Style

Jin-Lin Li; Yu-Hai Bao; Jie Wei; Xiu-Bin He; Qiang Tang; Jean De Dieu Nambajimana. 2019. "Fractal characterization of sediment particle size distribution in the water-level fluctuation zone of the Three Gorges Reservoir, China." Journal of Mountain Science 16, no. 9: 2028-2038.