scholarly journals Carbon Sequestration in Agroforestry Systems between Conservation Agriculture and Conventional Practice in The Asal Area of Machakos County, Kenya

2020 ◽  
Vol 4 (2) ◽  
pp. 118-133
Author(s):  
Vincent O Rabach ◽  
James Koske ◽  
Monicah Mucheru Muna ◽  
Jonathan Muriuki ◽  
Innocent Osoro Ngare
Keyword(s):  
Carbon Sequestration ◽  
Block Design ◽  
Conservation Agriculture ◽  
Agroforestry Systems ◽  
Carbon Stocks ◽  
Calliandra Calothyrsus ◽  
Low Carbon ◽  
Training Centre ◽  
Sequestration Potential ◽  
Conventional Practice

Dryland ecosystems have always been prone to relatively high vegetation and general environmental degradation; translating to changes in soil physical and chemical properties and massive carbon losses. Despite their vast surface area, Carbon sequestration therein still remains low. However, this low carbon means they are less saturated and therefore a tremendous potential therein to sequester more Carbon. Conservation agriculture with trees (CAWT) presents an opportunity to reduce the degradation and enhance the carbon stocks. This study was set to compare the biomass productivity and carbon sequestration potential of agroforestry between conventional and conservation agriculture practice. The  study was carried out as part of ongoing experimentation established in short rain (SR) season of 2012 by the World Agroforestry Centre in a trial site at the Agricultural Training Centre (ATC) in Machakos county, Kenya. The trials adopted a split plot arranged in a randomized complete block design with two farming systems (conventional and conservation agriculture) as the main blocks, 7 treatments and three replicates, summing to a total of 42 plots. In the fields, two shrub species (Calliandra calothyrsus Meissn. and Gliricidia sepium Jacq.) were planted in three different spacing (1.5x1 m, 3x1 m, 4.5x1 m) for maize-legume intercrops. Trees were harvested by coppicing, weighed and leaf/twig samples taken for determination of biomass, which was then converted to Carbon using a conversion factor 0.5. The data was statistically analyzed using ANOVA and means separated using LSD at p <0.05. Results showed significant increase in carbon sequestration under conservation agriculture (p <0.001), with a yearly sequestration potential of between 12.8 and 24 Mg C/ha/yr compared to 11.6-23 Mg C/ha/yr for conventional practice. Calliandra also sequestered more carbon than Gliricidia. CAWT is therefore concluded to be a feasible way of increasing carbon stocks in the drylands.

Quantifying carbon stocks and sequestration potential in agroforestry systems under divergent management scenarios relevant to India’s Nationally Determined Contribution

2021 ◽  
Vol 281 ◽  
pp. 124831
Author(s):  
Arun Jyoti Nath ◽  
Gudeta Weldesemayat Sileshi ◽  
Sabina Yasmin Laskar ◽  
Karabi Pathak ◽  
Demsai Reang ◽  
...  
Keyword(s):  
Agroforestry Systems ◽  
Carbon Stocks ◽  
Management Scenarios ◽  
Sequestration Potential

scholarly journals Carbon Sequestration Potential of Agroforestry Systems in the Indian Arid Zone

2019 ◽  
Vol 117 (12) ◽  
pp. 2014 ◽  
Author(s):  
S. P. S. Tanwar ◽  
Praveen Kumar ◽  
Archana Verma ◽  
R. K. Bhatt ◽  
Akath Singh ◽  
...  
Keyword(s):  
Carbon Sequestration ◽  
Arid Zone ◽  
Agroforestry Systems ◽  
Carbon Sequestration Potential ◽  
Sequestration Potential

Assessing the potential of urban soil for carbon sequestration by adding wheat straw pellets or wheat straw biochar

2020 ◽  
Author(s):  
Jiaqian Wang ◽  
David Werner ◽  
David Manning
Keyword(s):  
Carbon Sequestration ◽  
Wheat Straw ◽  
Urban Soil ◽  
Carbon Dioxide Emissions ◽  
Total Carbon ◽  
Limited Area ◽  
Low Carbon ◽  
Soil Environment ◽  
Sequestration Potential ◽  
Set Up

&lt;p&gt;Higher Education in England targets to reduce by an average 34% carbon dioxide emissions until 2020 based on the level in 1990. This project not only requires various departments of universities to improve their energy system by utilizing low carbon techniques but also challenges the academics and researchers to examine multiple approaches to sequester carbon as much as possible in the limited area. Land owned by universities contains a lot of carbon. The group SUCCESS (Sustainable Urban Carbon Capture Engineering Soils for Climate Change) in Newcastle University has observed that 10 ha of urban soil near Newcastle Science Central removed almost 80 T CO&lt;sub&gt;2&lt;/sub&gt; per hectare every month.&lt;/p&gt;&lt;p&gt;The project has set up two lysimeters in June 2018 to investigate the addition of wheat straw pellets (WP) versus biochar (BC) produced from this biomas as carbon sequestration strategies. Sensors were set up at different depths to collect information about the internal soil environment. The wheat straw biochar has 69.04% C content, and it was applied to the soil at a rate of 2% (w/w); the application rate of wheat straw pellets is based on the carbon weight of wheat straw biochar. Therefore, the amount of carbon added as wheat straw pellets, or as wheat straw biochar was 29.8&amp;#177;0.57 Kg in each lysimeter.&lt;/p&gt;&lt;p&gt;Cumulatively, 704.23&amp;#177;0.14 g and 697.17&amp;#177;0.1 g of total carbon were leached from the lysimeter BC and lysimeter WP, respectively, till the end of November 2019. Meanwhile, the total amount of CO2 carbon released via respiration of soil carbon was 9.65&amp;#177;0.35 Kg and 6.17&amp;#177;0.19 Kg for lysimeter BC and lysimeter WP, respectively, from August 2018 to November 2019. Moreover, the carbon mass fixed, measure as dried grass biomass in the two systems was 1.57 Kg for lysimeter BC and 1.75 Kg for lysimeter WP. The net C mass stored according to the mass balance for the lysimeter BC is 21.02 &amp;#177;0.67 Kg from the topsoil during the experiment period, and 24.68&amp;#177;0.6 Kg in lysimeter WP. Whereas, by measurement, the amount of carbon in the topsoil has shown an increase of 37.09&amp;#177;13.58 Kg and 19.51&amp;#177;3.36 Kg in lysimeter BC and lysimeter WP, respectively. Currently, the data obtained in this study indicate that the mixture of biochar and biomass amendment promotes carbon sequestration potential in the urban soil environment and further application details on land owned by the university can be explored.&lt;/p&gt;

scholarly journals Carbon sequestration potential through conservation agriculture in Africa has been largely overestimated

2020 ◽  
Vol 196 ◽  
pp. 104300 ◽  
Author(s):  
Marc Corbeels ◽  
Rémi Cardinael ◽  
David Powlson ◽  
Regis Chikowo ◽  
Bruno Gerard
Keyword(s):  
Carbon Sequestration ◽  
Conservation Agriculture ◽  
Carbon Sequestration Potential ◽  
Sequestration Potential
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