Soil organic carbon and aggregation under poplar based agroforestry system in relation to tree age and soil type

Aggregate stability and carbon (C) sequestration in soils are closely related phenomena. However, high aggregate stability does not always ensure high carbon sequestration to some soil types since other binding agents could dominate other than carbon. Thus, this study aimed to determine the relationship between aggregate stability and carbon sequestration of different tropical soils which basically differ in geology, genesis, and possibly in their dominant aggregating agents. The study selected four representative soil types (Haplic Acrisol, Calcaric Cambisol, Silic Andosol and Haplic Ferralsol) found in Leyte and Samar that were characterized by previous workers. Soil Organic Carbon (SOC) and Aggregate Stability (AS) in dry and wet conditions were quantified using standard procedures. Some pertinent secondary data were also recorded as reference for each soil type. Results revealed that only Silic Andosol showed positive significant correlation (0.93) between aggregate stability and soil organic carbon (SOC). The other soil types showed weak and negative correlation between aggregate stability and SOC; however, their stability revealed a strong positive relationship with inorganic binding agents. Therefore, each soil type reflects a different relationship between aggregate stability in wet condition and SOC and that the variations could be attributed to the differences in the morpho-physical and geochemical nature of the soils. Moreover, SOC is found to greatly influence the aggregate stability in Silic Andosol, thus the soil carbon sequestration potential of this soil type is generally related to its aggregate stability. However, in other soil types like Haplic Acrisol, Calcaric Cambisol, and Haplic Ferralsol, other binding agents like Calcium (Ca) and iron oxides dominate and control the formation and stability of aggregates rather than SOC.

Download Full-text

An Integrated Model Approach for Quantifying Carbon Emissions From Residue-Based Biofuel Production

Volume 2A: 33rd Computers and Information in Engineering Conference ◽

10.1115/detc2013-13491 ◽

2013 ◽

Author(s):

Jared M. Abodeely ◽

David J. Muth ◽

Joshua Koch ◽

Kenneth M. Bryden

Keyword(s):

Organic Carbon ◽

Soil Organic Carbon ◽

Co2 Emissions ◽

Land Management ◽

Soil Type ◽

Co2 Emission ◽

Integrated Model ◽

Soil Types ◽

County Level ◽

Residue Removal

This paper presents an agricultural residue removal decision framework that couples the environmental process models WEPS, RUSLE2, SCI, and DAYCENT. One of the goals of this integrated model is to quantify the impacts of land management strategies on soil organic carbon and CO2 emissions. Soil, climate, and land management practices are considered in determining sustainable residue removal rates using wind- and water-induced soil erosion and qualitative soil organic carbon constraints and to quantify the long-term impacts of sustainable residue removal on soil organic carbon and greenhouse gas emissions. Using this integrated model sustainable residue removal for four crop rotations, three tillage regimes, and four soil types representing nearly 70% of the arable acres in Boone County, Iowa are examined. Each scenario was performed for a twenty-year period. Soil organic carbon and CO2 emission results are aggregated by soil type using crop rotation and tillage statistics. The soil type results are aggregated using a normalized percentage area to provide a county level estimate of soil organic carbon changes and CO2 emissions. Results show that for the largest sustainable residue removal rate that soil organic carbon increased 3.53–6.63 Mg/ha over the 20 year simulation and that CO2 emissions ranged from 3.50–4.23 Mg/ha across the four soil types resulting in an average increase of soil organic carbon of 4.85 Mg/ha and CO2 emission of 3.77 Mg/ha at the county level.

Download Full-text

Discrepancies in Karst Soil Organic Carbon in Southwest China for Different Land Use Patterns: A Case Study of Guizhou Province

International Journal of Environmental Research and Public Health ◽

10.3390/ijerph16214199 ◽

2019 ◽

Vol 16 (21) ◽

pp. 4199

Author(s):

Zhenming Zhang ◽

Xianfei Huang ◽

Yunchao Zhou ◽

Jiachun Zhang ◽

Xubo Zhang

Keyword(s):

Land Use ◽

Organic Carbon ◽

Soil Organic Carbon ◽

Soil Type ◽

Southwest China ◽

Potassium Dichromate ◽

Soil Samples ◽

Guizhou Province ◽

Land Uses ◽

Karst Areas

The assessment of soil organic carbon (SOC) in mountainous karst areas is very challenging, due to the high spatial heterogeneity in SOC content and soil type. To study and assess the SOC storage in mountainous karst areas, a total of 22,786 soil samples were collected from 2,854 soil profiles in Guizhou Province in Southwest China. The SOC content in the soil samples was determined by the oxidation of potassium dichromate (K2Cr2O7), followed by titration with iron (II) sulfate (FeSO4). The SOC storage was assessed based on different land uses. The results suggested that the average SOC density in the top 1.00 m of soil associated with different land uses decreased in the following order: Croplands (9.58 kg m−2) > garden lands (9.07 kg m−2) > grasslands (8.07 kg m−2) > forestlands (7.35 kg m−2) > uncultivated lands (6.94 kg m−2). The SOC storage values in the 0.00–0.10 m, 0.00–0.20 m, 0.00–0.30 m and 0.00–1.00 m soil layers of Guizhou Province were 0.50, 0.87, 1.11 and 1.58 Pg, respectively. The SOC in the top 0.30 m of soil accounted for 70.25% of the total within the 0.00–1.00 m layer in Guizhou Province. It was concluded that assessing SOC storage in mountainous karst areas was more accurate when using land use rather than soil type. This result can supply a scientific reference for the accurate assessment of the SOC storage in the karst areas of southwestern China, the islands of Java, northern and central Vietnam, Indonesia, Kampot Province in Cambodia and in the general area of what used to be Yugoslavia, along with other karst areas with similar ecological backgrounds.

Download Full-text

Effect of size and altitude on soil organic carbon stock in homegarden agroforestry system in Central Himalaya, India

Acta Ecologica Sinica ◽

10.1016/j.chnaes.2020.10.002 ◽

2020 ◽

Vol 40 (6) ◽

pp. 483-491

Author(s):

K. Bargali ◽

S.S. Bargali

Keyword(s):

Organic Carbon ◽

Soil Organic Carbon ◽

Carbon Stock ◽

Agroforestry System ◽

Central Himalaya ◽

Soil Organic Carbon Stock ◽

Organic Carbon Stock

Download Full-text

Soil organic carbon under a linear simultaneous agroforestry system in Uganda

Agroforestry Systems ◽

10.1007/s10457-011-9448-6 ◽

2011 ◽

Vol 84 (1) ◽

pp. 11-23 ◽

Cited By ~ 9

Author(s):

Susan Balaba Tumwebaze ◽

Eddie Bevilacqua ◽

Russell Briggs ◽

Timothy Volk

Keyword(s):

Organic Carbon ◽

Soil Organic Carbon ◽

Agroforestry System

Download Full-text

Capacity for increasing soil organic carbon stocks in dryland agricultural systems

Soil Research ◽

10.1071/sr12373 ◽

2013 ◽

Vol 51 (8) ◽

pp. 657 ◽

Cited By ~ 39

Author(s):

F. C. Hoyle ◽

M. D'Antuono ◽

T. Overheu ◽

D. V. Murphy

Keyword(s):

Land Use ◽

Organic Carbon ◽

Soil Organic Carbon ◽

Western Australia ◽

Soil Type ◽

Storage Capacity ◽

Soil Depth ◽

Continuous Cropping ◽

Agricultural Systems ◽

Soc Stock

Assessment of the potential for soil carbon sequestration based on soil type, land use, and climate scenarios is crucial for determining which agricultural regions can be used to help mitigate increasing atmospheric CO2 concentrations. In semi-arid and Mediterranean-type environments, soil organic carbon (SOC) storage capacity is rarely achieved under dryland agricultural systems. We aimed to assess both actual (measured) and attainable (modelled) SOC stock values for the dryland agricultural production zone of Western Australia. We measured actual SOC storage (0–0.3 m) and known constraints to plant growth for a range of soils types (3–27% clay) and land uses (continuous cropping, mixed cropping, annual and perennial pastures) on the Albany sand plain in Western Australia (n = 261 sites), spanning a rainfall gradient of 421–747 mm. Average actual SOC stocks for land use–soil type combinations ranged from 33 to 128 t C/ha (0–0.3 m). Up to 89% of the variability in actual SOC stock was explained by soil depth, rainfall, land use, and soil type. The scenarios modelled with Roth-C predicted that attainable SOC values of 59–140 t C/ha (0–0.3 m) could be achieved within 100 years. This indicated an additional storage capacity of 5–45% (7–27 t C/ha) depending on the specific land use–soil type combination. However, actual SOC in the surface 0–0.1 m was 95 to >100% of modelled attainable SOC values, suggesting this soil depth was ‘saturated’. Our findings highlight that additional SOC storage capacity in this region is limited to the subsoil below 0.1 m. This has implications for management strategies to increase SOC sequestration in dryland agricultural systems, as current practices tend to concentrate organic matter near the soil surface.

Download Full-text