Carbon storage of land cover types in the western margin of Mt. Makiling, Laguna, Philippines

Date

2003

Abstract

Carbon storage of land cover types that represent stages of a commonland use system in Barangay Puting Lupa, Calamba City, at the western margin of the Mt. Makiling Forest Reserve was determined. The land cover types are an open kaingin (cultivated for 1 year), 13- and 22 year old abandoned kaingins, ipil-ipil (Leucaena leucocephala) - dominated stand, and secondary forest located at the ridges. The C stock in the following pools was measured using field methods : live trees, coarse woody debris, understorey vegetation, standing litter, coarse-and fine roots, and soil up to a 30 cm depth. AADeterministic models were used to estimate aboveground tree biomass and coarse woody debris necromass. The estimates for C stored in live trees are : 19.09 - 40.13 Mg/ha for the open kaingin; 24.78 - 46.62 Mg/ha for the 13 year old abandoned kaingin; 38.00 - 67.16 Mg/ha for the 22 year old abandoned kaingin; 38.75-74.78 Mg/ha for the ipil-ipil stand, and 33.42-67.16 Mg./ha for the secondary forest. For coarse woody debris, the estimates are : 1.66-2.58 Mg/ha for the open kaingin; 0.11 Mg/ha for the 13 year old abandoned kaingin; 2.21 - 3.17 Mg/ha for the 22 year old abandoned kaingin; 10.43 Mg/ha for the ipil-ipil stand, and 3.34 - 6.72 Mg/ha for the secondary forest. The understorey C stocks are : 0.02 Mg/ha for the open kaingin; 5.71 Mg/ha for the 13 year old abandoned kaingin; 0.90 Mg/ha for the 22 year old abandoned kaingin; 6.55 Mg/ha for the ipil-ipil stand, and 0.72 Mg/ha for the secondary forest. The estimated C stocks in standing litter are : 1.352 Mg/ha for th open kaingin; 3.075 Mg/ha for the 13 year old abandoned kaingin; 3.038 Mg/ha for the 22 year old abandoned kaingin; 3.044 Mg/ha for the ipil-ipil stand, and 3.501 Mg/ha for the secondary forest, while for roots, the values are : 0.524 Mg/ha for the open kaingin; 0.618 Mg/ha for the 13 year old abandoned kaingin; 0.517 Mg/ha for the 22 year old abandoned kaingin; 0.877 Mg/ha for the ipil-ipil stand, and 1.767 Mg/ha for the secondary forest. AAThe open kaingin has the lowest total soil C storage (42.11 Mg/ha), followed by the 22 year old abandoned kaingin (50.74 Mg/ha); secondary forest (57.70 Mg/ha); 13-year old abandoned kaingin (57.83 Mg/ha), and ipil-ipil stand (66.65 Mg/ha). AAThe land cover types, in decreasing order of total C stock are : ipil-ipil stand secondary forest 22-year old abandoned kaingin 13 year old abandoned kaingin open kaingin. Estimates for C stock and aboveground C accumulation rates (2 Mg/ha/yr for the abandoned kaingins and 2-3 Mg/ha/yr for the ipil-ipil stand) indicate that belowground C storage is less prone to losses from land use and natural disturbances but greater C sequestration will be potentially achieved aboveground. Land use analysis of the study area indicates that for the past 20-30 years the system has been in CO2 equilibrium, and that a potential net gain in total system C stocks can occur if the direction of land use continues to shift towards permanent tree-based systems (agroforests), with adequate protection of regenerating lands.

Document Type

Master Thesis

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

LG 995 2003 E8 B35

This document is currently not available here.

Share

COinS