Seca Gandaseca

Assessment of Carbon Stock in Chronosequence Rehabilitated Tropical Forest Stands in Malaysia

The loss and degradation in tropical forest region are some of the current global concern. Hence, these issues elevated the role of rehabilitated forests in providing ecological products and services. The information on the carbon stock is important in relation to global carbon and biomass use, but lacking from the tropical region. This paper reports the assessment of tree and soil carbon stock in a chronosequence rehabilitated tropical forest stands in Malaysia. The study site was at the UPM-Mitsubishi Forest Rehabilitation Project, UPMKB. 20{\times}20m plot was established each and assessed in 2009 at 1-, 10- and 19-year-old sites while an adjacent ?23-year-old natural regenerating secondary forest plot was established for comparison. The overall total carbon stock was in the order of 19-year-old>?23-year-old>10-year-old>1-year-old. When forest carbon stock is low, the soil component plays an important role in the carbon storage. The forest carbon recovery is crucial to increase soil carbon stock. The variations in the carbon stock showed the different stages of the forest recovery. Species survived after 19-years of planting are potential species for carbon sequestration activities in rehabilitated forest. Human intervention in rehabilitating degraded forest areas through tree planting initiatives is crucial towards recovering the forest ecological role especially in forest carbon stock capacity.

Assessment of Nutrient Availability on Sediment Matang Mangrove Forest, Perak

Sediment has a potential in nutrient availability and plays an important for fertility rate at mangroves ecosystem. In mangrove ecosystem sediments were found abundantly in the river bank. Therefore, to prove this statement, macro and micro nutrients were taken on sediment of mangrove forest at Matang mangroves, Perak. The objectives of this study are to provide fundamental information on sediment nutrient availability at the Sungai Sepetang and to compare 3 different zones and 5 different depths. One transect line was established along the river and divided into three zones (Upstream, Middle stream, Downstream). About 75 of sediment samples were collected using peat auger in 5 different depths (0-15 cm, 15-30 cm, and 30-50 cm,). A standard method was used in sediment preparation and laboratory analysis. The obtained data were analyzed using Statistical Analysis System (SAS) Version 9.2 to find mean comparisons between the zones and depths. As a result of fundamental information on sediment physiochemical properties for pH level from (3.17-5.03) which are acidic and the electrical conductivity range from (14.34-23.87[mS/cm]). Whereas, for nutrient availability were showing significant difference with the highest amount of Magnesium 3.93a(±0.092) in middle stream. For available nutrient such as Nitrogen, Potassium, Phosphorus, and manganese were similar. Lastly, depth 1 (0-15 cm) was showing significant difference and recorded the higher amount of nutrient content of Magnesium 3.703a(±0.156) and Potassium 1.541b(±0.079). As a conclusion, sediment is one of the potential for nutrient availability, but more researches are needed to be done to prove that the nutrient availability percentages are encouraged by mangrove zones and depths.