C-stocks for 12 year timber and fruit tree plantations. ABG and BLG C decreased in
the following order: pine ) teak > Chukrasia tabularis > mango ) longan >
mixed fruit tree > banana, indicating that only pine and teak trees maintained
higher C amounts BLG. This decrease has consequences for a soil’s ability to
withstand water induced erosion (see Chap. 7).
3.5.2 The Above-Ground Biomass and Carbon Stocks of
Upland Crops
In the Chieng Khoi watershed, annual crop production activities are dominated by
maize and cassava. Usually, maize is planted in early May with the onset of the
monsoon rains then harvested in September. Cassava is also planted in May;
Table 3.3 ABG C stocks of 10 perennial land use systems. Data were collected in the Chieng
Khoi watershed in 2009
Land-use type
Rotation
time (year)
Annual time-averaged
C-accumulation
(Mg ha
À1 year
À1
)
Time-averaged C
sequestration –
entire rotation (Mg ha
À1
)
Mango
20
3.25
65.1
Longan
20
0.73
14.6
Banana
20
0.40
8.0
Mixed fruit trees
20
0.51
10.1
Teak
12
3.78
45.4
Chukrasia tabularis
12
1.96
23.6
Pine
12
6.03
72.4
Protected natural forest
50
4.35
217.5
Bamboo forest
40
3.84
153.7
Secondary forest
30
1.59
47.7
C stocks were estimated by using the IPCC biomass C default value (IPCC 2007)
Fig. 3.17 Time-averaged and estimated ABG, BLG and total C stocks [Mg ha
À1
] for 12 year old
teak, Chukrasia tabularis, pine, banana, longan, mixed fruit tree and mango plantations. Error bars
show the standard deviation from the mean of the two sampling plots (Zemek 2009)
3 Water and Matter Flows in Mountainous Watersheds of Southeast Asia:. . .
137