Articles



Vol. 25 Nos. 1&2

Climate change has taken a huge impact in the research world. Several studies have been conducted to determine its effects in the environment. In the Philippines, while we have lower carbon emissions compared to other developing countries, we are considered to be one of the most vulnerable to the impacts of climate change.

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Volume 24 Nos. 1 & 2

Biomass and carbon sequestration of Jatropha curcas L. plantation Maximo V. Lanting, Jr. Science Research Specialist Ecosystems Research and Development Bureau College, 4031, Laguna stvincent1945@yahoo.com Leuvina M. Tandug, Ph.D. Assistant Director, ERDB Paulino A. Umali, Jr. Science Research Specialist II Nelson Levi M. Lantican Science Research Assistant One of the most pressing problems nowadays is global warming brought about by the increasing levels of greenhouse gases, particularly carbon dioxide (CO2), in the atmosphere. Plants take up CO2 from the atmosphere and store the carbon in their biomass (roots, stems and foliage) through the process of photosynthesis.

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Volume 23 Nos. 1 & 2

Acidity, conductivity and ionic trends of rainwater in acid deposition monitoring sites in Los Baños, Laguna and Quezon City, Philippines Arcely C. Viernes Science Research Specialist II Research and Development Division, Environmental Management Bureau DENR Compound, Visayas Avenue, Diliman, Quezon City Tel. No.: 632-426-4332 Email address: cely_emb@yahoo.com Maricris T. Laciste Science Research Specialist II This study aimed to establish trends of levels of acidity (pH), conductivity (EC), and concentrations of anions (SO4 2-, NO3-, Cl-) and cations (NH4+, Na+, K+, Ca2+, Mg2+) in rainwater on urban and rural acid deposition monitoring sites in the Philippines. The results of the study will be significant in establishing local acid deposition baseline data to prove or disprove acid deposition occurrence in the Philippines and to provide useful inputs for decision-making aimed at preventing or reducing adverse impacts of acid deposition. The investigation was conducted in Los Baños, Laguna (Los Baños site) and Quezon City (Metro Manila site), categorized as rural and urban sites, respectively, under the Acid Deposition Monitoring Network in East Asia (EANET) protocol. Weekly monitoring, collection, and laboratory analysis of samples were conducted using standard analytical methods and EANET quality assurance and quality control (QA/QC) procedures.Time series analysis of data from 2001 to 2009 for both sites showed a general decreasing annual trend for all parameters. Seasonal trends were observed to be consistent with annual trends. Correlations between the parameters analyzed are outside the scope of this study and should be the focus of further assessment of the state of acid deposition in the Philippines.

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Volume 22 Nos. 1 & 2

Aboveground biomass and carbon stock assessment of forest plantations in Mindanao Leuvina Micosa-Tandug, Ph.D. Chief Science Research Specialist Ecosystems Research and Development Bureau Department of Environment and Natural Resources College, Laguna, 4031 Philippines The study was conducted to estimate biomass accumulation of five forest tree plantation species (bagras, falcata, mahogany, mangium and yemane) and quantify the carbon stock of the commercial plantations in Mindanao.

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