Kaliwa watershed in the provinces of Rizal and Quezon is a site for pilot implementation of an improved watershed management plan in the Philippines. As part of the key biophysical resource assessments for the watershed carbon stocks in above-ground biomass necromass and soil pools in different forest land uses were determined using field measurements. The total C stored in the different land uses surveyed in the Kaliwa Watershed is estimated at 2.65 Megatons 76% of which is held in secondary forests and 14% and 10% in brushlands and grasslands respectively. In all land uses the largest portion of C is held in the soil. The low C density estimates (secondary forests- 121.21 Mg/ha; brushland- 74.27 Mg/ha; and grassland-Â 57.56 Mg/ha) indicate that substantial degradation of forest resources has occurred through time. Activities to enhance the watershed's potential to serve as C sink were identified including forest protection reforestation of grassland areas and establishment of agroforestry and community-based forestry projects.
Publication year
2007
Authors
Pulhin, F.B.; Cruz, R.V.O.; Lasco, R.D.
Keywords
Carbon, Carbon sequestration, Dipterocarps, Logging, Watershed
