The importance of agroforestry as a land-use system for carbon (C) sequestration had
been recognized. The various levels of C stocks expressed into CO2 sequestered by major
agroforestry systems (AFSs) across the 16 community-based forest management (CBFM) sites
in Zamboanga City, Philippines was investigated. The major AFSs were compared to pure
forest stand (PFS). Among the AFSs, the rubber-based had the highest C stocks at 68.93 tC ha-1
compared to lanzones-based (60.33 tC ha-1), marang-based (60.23 tC ha-1) and mango-based
(60.01 tC ha-1). Some other types had below 60.0 tC ha-1 C stocks. In terms of net carbon
dioxide equivalent (net CO2e) sequestered, the PFS had the highest at 1,098.62 tCO2e ha-1
compared to the top four AFSs with the highest net tCO2e sequestered such as the rubber+3-
based, lanzones, marang and mango-based AFSs where each had about 248.66, 217.70, 218.17
and 217.41 tCO2e ha-1, respectively. The PFS had 5-7 times higher CO2e sequestered compared
with the top four AFSs. Results provided data that none of the AFSs can replace the real
pristine forest in terms of C sequestration (5.0 ha AFS is equal to 1.0 ha pristine forest) and its
watershed role as a net concerver of water. Further, it was observed that no water was available
in the 16 CBFM sites and community residents had to fetch water for their household use. Also,
Zamboanga City, Philippines had insufficient water for domestic use during extended rainless
or El Nino months.
Keywords
Energy inputs, agroforestry systems, pure forest stand, net carbon emission, net carbon sequestered
INTERNATIONAL JOURNAL OF AGRICULTURAL TECHNOLOGY
Published by : Association of Agricultural Technology in Southeast Asia (AATSEA) Contributions welcome at : http://www.ijat-aatsea.com
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