Quasi-equilibrium of organic carbon in shrink - swell soils of the subhumid tropics in India under forest, horticulture, and agricultural systems

Soil Research ◽  
2004 ◽  
Vol 42 (2) ◽  
pp. 181 ◽  
Author(s):  
R. Naitam ◽  
T. Bhattacharyya
Keyword(s):  
Land Use ◽  
Organic Carbon ◽  
Crop Production ◽  
Land Use Changes ◽  
Farmyard Manure ◽  
Tropical Soils ◽  
Agricultural System ◽  
Quasi Equilibrium ◽  
Agricultural Crop ◽  
Subhumid Tropics

Restoration of soil quality through soil organic carbon (SOC) management has been a major concern for tropical soils. SOC is sensitive to human activities such as deforestation, biomass burning, land-use changes, and environmental pollution. Our aim in this study was to elucidate the effect of land-use systems on quasi-equilibrium values (QEV) of SOC. To determine the QEV of SOC, 4 representative pedons from Nagpur district, Maharashtra, under horticulture (orange), agriculture (cotton, cotton + pigeonpea), and forest (teak) with the time of cultivation ranging from 20 years to centuries were selected. The study indicated that the QEV of SOC in the shrink–swell soils decreased when they were used for agricultural crop production. Since all these soils have similar substrate, the SOC equilibrium values obtained in soils of horticultural and forest ecosystems may also be attainable in the soils under agricultural system. In other words, addition of external sources of farmyard manure or other green manure may raise the QEV of SOC from 0.44–0.51% to 0.70–0.80% in soils of agricultural system.

scholarly journals The Effect of Anaerobic Digestate on the Soil Organic Carbon and Humified Carbon Fractions in Different Land-Use Systems in Lithuania

Land ◽  
2022 ◽  
Vol 11 (1) ◽  
pp. 133
Author(s):  
Alvyra Slepetiene ◽  
Mykola Kochiieru ◽  
Linas Jurgutis ◽  
Audrone Mankeviciene ◽  
Aida Skersiene ◽  
...  
Keyword(s):  
Land Use ◽  
Organic Carbon ◽  
Soil Organic Carbon ◽  
Field Experiments ◽  
Soil Layer ◽  
Fertilization Rate ◽  
Agricultural System ◽  
Main Task ◽  
Carbon Fractions ◽  
Fertilization Effects

The most important component of agricultural system are soils as the basis for the growth of plants, accumulation of water, plant nutrients and organic matter. The main task of our research was to ascertain changes in soil organic carbon (SOC) and mobile humified carbon fractions in digestate-treated soils. We have performed three field experiments using the same design on two soil types in 2019–2020. We studied the fertilization effects of different phases of digestate on Retisol and Fluvisol. Fertilization treatments: control; separated liquid digestate 85 kg ha−1 N; and 170 kg ha−1 170 N; separated solid digestate 85 kg ha−1 N; and 170 kg ha−1 N. We have found a greater positive effect on the increase in SOC because of the use of the maximum recommended fertilization rate of the solid digestate. The content of mobile humic substances (MHS) tended to increase in grassland and crop rotation field in digestate-treated soil. In our experiment, maximum concentration of SOC was found in 0–10 cm soil layer, while in the deeper layers the amount of SOC, MHS and mobile humic acids proportionally decreased. We concluded, that long-term factors as soil type and land use strongly affected the humification level expressed as HD (%) in the soil and the highest HD was determined in the grassland soil in Fluvisol.

scholarly journals Effects of land use changes and conservation measures on land degradation under a Mediterranean climate

2015 ◽  
Vol 7 (1) ◽  
pp. 115-145 ◽  
Author(s):  
Y. Mohawesh ◽  
A. Taimeh ◽  
F. Ziadat
Keyword(s):  
Land Use ◽  
Organic Carbon ◽  
Soil Organic Carbon ◽  
Land Degradation ◽  
Soil Conservation ◽  
Land Use Changes ◽  
Conservation Measures ◽  
Stone Walls ◽  
Effects Of Land Use ◽  
Soil Conservation Measures

Abstract. Land degradation resulting from improper land use and management is a major cause of declined productivity in the arid environment. The objectives of this study were to examine the effects of a sequence of land use changes, soil conservation measures, and the time since their implementation on the degradation of selected soil properties. The climate for the selected 105 km2 watershed varies from semi-arid sub-tropical to Mediterranean sub-humid. Land use changes were detected using aerial photographs acquired in 1953, 1978, and 2008. A total of 218 samples were collected from 40 sites in three different rainfall zones to represent different land use changes and different lengths of time since the construction of stone walls. Analyses of variance were used to test the differences between the sequences of land use changes (interchangeable sequences of forest, orchards, field crops, and range), the time since the implementation of soil conservation measures, and rainfall on the thickness of the A-horizon, soil organic carbon content, and texture. Soil organic carbon reacts actively with different combinations and sequences of land use changes. The time since stone walls were constructed showed significant impacts on soil organic carbon and the thickness of the surface horizon. The effects of changing the land use and whether the changes were associated with the construction of stone walls, varied according to the annual rainfall. The results help in understanding the effects of land use changes on land degradation processes and carbon sequestration potential and in formulating sound soil conservation plans.

Soil organic carbon dynamics: Impact of land use changes and management practices: A review

2019 ◽  
pp. 1-107 ◽  
Author(s):  
Thangavel Ramesh ◽  
Nanthi S. Bolan ◽  
Mary Beth Kirkham ◽  
Hasintha Wijesekara ◽  
Manjaiah Kanchikerimath ◽  
...  
Keyword(s):  
Land Use ◽  
Organic Carbon ◽  
Soil Organic Carbon ◽  
Management Practices ◽  
Land Use Changes ◽  
Carbon Dynamics ◽  
Soil Organic Carbon Dynamics

scholarly journals Effects of land use changes and soil conservation intervention on soil properties as indicators for land degradation under a Mediterranean climate

Solid Earth ◽  
2015 ◽  
Vol 6 (3) ◽  
pp. 857-868 ◽  
Author(s):  
Y. Mohawesh ◽  
A. Taimeh ◽  
F. Ziadat
Keyword(s):  
Land Use ◽  
Organic Carbon ◽  
Soil Organic Carbon ◽  
Soil Properties ◽  
Land Degradation ◽  
Soil Conservation ◽  
Land Use Changes ◽  
Stone Walls ◽  
Effects Of Land Use ◽  
Soil Conservation Measures

Abstract. Land degradation resulting from improper land use and management is a major cause of declined productivity in the arid environment. The objectives of this study were to examine the effects of a sequence of land use changes, soil conservation measures, and the time since their implementation on the degradation of selected soil properties. The climate for the selected 105 km2 watershed varies from semi-arid sub-tropical to Mediterranean sub-humid. Land use changes were detected using aerial photographs acquired in 1953, 1978, and 2008. A total of 218 samples were collected from 40 sites in three different rainfall zones to represent different land use changes and variable lengths of time since the construction of stone walls. Analyses of variance were used to test the differences between the sequences of land use changes (interchangeable sequences of forest, orchards, field crops, and range), the time since the implementation of soil conservation measures, rainfall on the thickness of the A-horizon, soil organic carbon content, and texture. Soil organic carbon reacts actively with different combinations and sequences of land use changes. The time since stone walls were constructed showed significant impacts on soil organic carbon and the thickness of the surface horizon. The effects of changing the land use and whether the changes were associated with the construction of stone walls varied according to the annual rainfall. The changes in soil properties could be used as indicators of land degradation and to assess the impact of soil conservation programs. The results help in understanding the effects of land use changes on land degradation processes and carbon sequestration potential and in formulating sound soil conservation plans.

scholarly journals Temporal changes of sediment dynamics within the Nairobi River sub-basins between 1998-2006 time scale, Kenya

2010 ◽  
Vol 42 (1) ◽  
pp. 17-22 ◽  
Author(s):  
Shadrack Kithiia ◽  
Boniface Wambua
Keyword(s):  
Water Quality ◽  
Land Use ◽  
Time Scale ◽  
Land Use Changes ◽  
Management Strategies ◽  
Temporal Changes ◽  
Sediment Dynamics ◽  
Eastern Africa ◽  
Agricultural System ◽  
The City

Temporal changes of sediment dynamics within the Nairobi River sub-basins between 1998-2006 time scale, Kenya The city of Nairobi is the heart of both industrial production and the economic hub in Kenya and the Eastern Africa region. The city of Nairobi and its environs are drained by three streams, namely: Nairobi, Mathare and Ngong rivers. These streams drain areas of diverse land use activities. The land use changes in a spatial manner from the rich agricultural system through residential cum urban to industrial. The significance of these various land use systems to pollutants generation, pollution, sediment generation and hence water pollution and quality degradation is quite enormous and worth investigation. The land use changes in a spatial manner making the basin ideal for a temporal variation of sediments yields along the river profile and their impacts on the water quality status. This paper examines the results of study carried out within the basins in the years 1998-2006. The method of study involved water sampling and laboratory analysis to reveal the trends in sediment load increases downstream the investigated streams. Soil samples were also investigated to determine their relationship to soil erosion rates and sediment fluxes. The study attempts further to find the best sediment management strategies in reversing their increasing trends and restoring water quality within the basin.

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