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years under TPLUS (3.98 t ha
−1
) was almost similar to those under IMPLUS (3.93 t ha
−1
),
TIMPLUS (3.87 t ha
−1
), TCLUS (3.85 t ha
−1
), and TCSFLUS (3.86 t ha
−1
) systems
but relatively higher than under the FPLUS system (3.52 t ha
−1
) (Appendix 3). The
results indicate that tree-based systems would be able to sustain soil nutrients at
higher levels over time than current farmers' practice of annual maize cropping.
14.3.5.4
Net Carbon Flow
5
The pattern of predicted net carbon flow (NCF) was similar to that of aboveground
biomass carbon for all land use alternatives (Fig. 14.6) since NCF is the incremental
value of carbon accumulation in standing biomass with adjustment from erosion
and oxidation losses, and emission. The average net carbon flow for 30 years under
the TPLUS system was about 5.95 t C ha
−1
year
−1
compared to 2.98 t C ha
−1
year
−1
for TCSFLUS, 1.96 t C ha
−1
year
−1
for TCLUS, 1.47 t C ha
−1
year
−1
for TIMPLUS,
45
40
35
30
25
20
15
10
5
0
-
5
-
10
0
5
10
15
20
25
30
Year
IMPLUS
FPLUS
TIMPLUS
TCLUS
TCSFLUS
TPLUS
Fig. 14.6
Net carbon flows (tC/ha) over time of alternative land use systems, Claveria, Misamis
Oriental, The Philippines
5
The annual net carbon flow (NCF) is the summation of the annual carbon flow in the plant-soil
system and the amount of carbon locked up in the timber products used in durable products such
as furniture less the amount of carbon emission from the gradual decay of woods in the durable
products. Alternatively, NCF is the net incremental amount of carbon sequestered over time used
in the analysis to impute the value of carbon sequestration for each land use alternative.
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