Comparación del almacenamiento de carbono bajo dos usos de suelo en la provincia de El Oro
One of the main greenhouse gases (GHG) is CO2, which has shown its increase since the 1990s and therefore studies for mitigation of the problem of climate change. The agricultural sector also influences the increase of these gases through agricultural activities, the change of land use which alters...
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| Format: | bachelorThesis |
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2017
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| Online Access: | http://repositorio.utmachala.edu.ec/handle/48000/11709 |
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Add Tag | Summary: | One of the main greenhouse gases (GHG) is CO2, which has shown its increase since the 1990s and therefore studies for mitigation of the problem of climate change. The agricultural sector also influences the increase of these gases through agricultural activities, the change of land use which alters the circulation of carbon (C) in the same. This is why terrestrial ecosystems are significant in reducing GHG. To be more exact, the soil is the largest reservoir or retention of C after the oceans, the soil is capable of storing 1,500 Gt (Gt) at 1 m depth. This research was framed in the soil study regarding the comparison of C storage in two uses of Plot 1 (Pasture) and Plot 2 (Forest), to determine the storage in each of these. In plot 1, 2 transects of 30 m each were evaluated, taking every 0-15-30 m of the transect section to extract soil samples (0-10 cm, 10-20 cm; 20-40 cm) to evaluate physical and chemical properties (Da, CE, pH, Texture, Soil color, MO, CO) and also extract aerial biomass of grass to establish the C content; this was done in both transects. In plot 2 the evaluation corresponds to the same methodology, except for not having taken aerial biomass samples. The analysis of the samples was carried out in the Soil Laboratory of the UTMACH. The soils analyzed correspond to dark-gray alluvial origin, which are characterized by their fertility and MO storage. The apparent density was determined by the well known volume cylinder method (Forsythe-Warren et al., 1975) which establishes that the Da for both land uses presents very close averages to different depths for general consideration in Pasto the average is of 1,11 gcm-3 and in Forest 1,10 gcm-3. The higher clay content presents the use of pasture soil compared to the use of forest soil. The EC presents medium to high ranges in Pasto 0,87 dsm (0-10 cm), and 1,12 dsm in depth of 10-20; 20-40 cm and in Bosque minor CE 0,39 dsm (0-10 cm), 0,79 dsm (10-20 cm), 1,19 cm (20-40 cm). To determine MO, the method of Walkley and Black (1934) was used and subsequently determine the C content in the soil. Statistical analyzes have shown that the highest C content in the soil at depth 0-10 cm (3.55% C) was evidenced in plot 2 and at a lower content in Plot 1 (1,68% C), demonstrates the hypothesis raised in the investigation. In particular for the strata 20-40 cm the content of C in Plot 1 decreases to 0,67% C and in Plot 2 it does not present any C%. The biomass content in various pastures of 9,81-14,00 Mg C ha-1 while the content for C in the soil was 76,48 to 35,23 Mg C ha-1. |
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