Estimation and mapping of soil organic carbon stocks of different land uses in Science City of Muñoz, Nueva Ecija [manuscript]
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Date
2017
Authors
Aldrin B. Geronimo
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Abstract
A total of 106 composite soil samples representing 9,691 ha were collected from different land uses of the Science City of Muñoz in order to determine and map the distributionof organic carbon and identify factors affecting its storage in soil. It was revealed that grasslands store about 8.32 (≠ 4.01) t (C ha-1 which does not statistically differ from the amount stored by rice multiculture and rice monoculture with 7.46 (≠ 2.54) t C ha-1 and 7.199 (≠ 3.06) t C h-1, respectively. The comparable levels of carbon stock was attributed to the low bilk density measured in grass lands despite their higher soil organic carbon content (SOC) and high bulk density in rice land uses despite their lower SOC.
Soil properties that were found to be negatively correlated (p<0.05) with SOC are silt content and bulk density, i.e. as silt content and bulk density increased, SOC decreased. Positive correlation was established with clay content, i.e. as clay content increased, SOC also increased.
The same negative correlation was found between carbon stock and silt content, while positive correlation appeared between carbon stock, bulk density and clay content.
As for farm management practices in rice, no significant differences in terms of carbon storage were found among different sources of irrigation and different levels of nitrogen fertilizer application. On the other hand, incorporation of rice straw was found to advantageous over crop stubble removal in terms of sequestcarbom. Yield was found to be correlated (p<0.05) with % SOC but not with carbon stock.
Using the Inverse Distance Weighted (IDW) method of interpilation, the soil organic carbon stock of the fisrt 5 cm of the soil of the study area was mapped and estimated at 75,263.38 tons.