Nitrous oxide emissions from soil cores in selected areas in Los Baños, Laguna, Philippines

Date

4-2008

Degree

Bachelor of Science in Chemistry

College

College of Arts and Sciences (CAS)

Adviser/Committee Chair

Josefina L. Solivas

Abstract

RENOLAYAN, LILIO JR., College of Agriculture-College of Arts and Sciences, University of the Philippines Los Banos, April 2008. Nitrous Oxide Emissions from Soil Cores in Selected Areas in Los Banos, Laguna, Philippines

Adviser: Prof. Josefina L. Solivas

Nitrous oxide (N20) is a potent greenhouse gas and participates in ozone destructive reactions in the stratosphere. Surface emissions of N20 were measured from three soil cores by headspace analysis using gas chromatography. This study examined N20 flux and accumulation in soils from three land uses in Los Banos, Laguna, Philippines; dumpsite, forest and agricultural soil. The mean emission of N20 determined from headspace sampling of soil cores were 0.212 mgfHa per day N20 obtained from Mt. Makiling dumpsite, 0.304 mg/Ha per day N20 from Makiling Forest and 0.196 mg/Ha per day from the UPLB Central Experiment Station.

The N20 emissions from the forest were about 2 orders of magnitude higher than the highest emission obtained from the agricultural soil and I order of magnitude higher than the highest emission from the dumpsite soil. Soil properties from soil samples which include moisture content, organic matter content and pH have direct relation on N20 emission

Based on land area in Los Banos and using the daily emissions, the total N20 contribution of the Mi Makiling dumpsite was 0.02%. Forest lands, which constitute large areas, can contribute 91% and the agricultural soil can account for 9% of total N20 emission. N20 emission estimated from the forest soils was high but in reality can be fixed by the forest cover. Dumpsite soils do not have vegetation to take in the substrates for N20 production thus represent a threat to the ozone layer.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

LG 993.5 2008 A13 R46

Document Type

Thesis

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