Environmental Engineering Reference
In-Depth Information
Table 1 Accuracy assessment classification
Class name
Reference totals
Classified totals
Number
correct
Producers
accuracy (%)
Conditional kappa for
each category (K^)
Unclassified
1
1
1
-
0.8407
Forest
6
7
6
100.00
0.7852
Mixed secondary
4
5
4
100.00
1.000
Water
4
4
4
100.00
0.6588
Others
0
0
0
-
1.000
Farm and plantation
7
4
4
57.14
1.000
Plantation
6
5
5
83.33
1.000
Lava
2
2
2
100.00
1.000
Settlements
13
11
11
84.62
1.000
Cloud
2
2
2
100.00
1.000
Mangrove
3
4
3
100.00
0.7364
Totals
58
58
52
Overall classification accuracy
= 89.66 %
Overall kappa statistics
= 0.8834
Table 2 Surface area occupied by various land uses in the study area
Landuse (ha)
1986
2000
2011
Dense forest
43,280.9
14,032
24,564
Mixed secondary forest
16,253
25,916
23,515
Plantation
67,792
51,295
68,340
Farmland and plantation
4,149
34,453
23,515
Mangrove
21,557
16,286
17,855
Settlements
11,022
11,312
13,512
Lava
835
667
278
Cloud
20,608
40,270
23,238
demand of banana and other plantation produces in the
Western world. This has caused many national and inter-
national companies to be increasingly involved in this
activity. Also, various assistance schemes such as the sup-
ply of free seedlings and financial assistance to individuals
and community-based organizations such as the common
initiative groups through the South West Development
Authority (SOWEDA) have made the process of starting a
plantation fairly easy.
The role of plantation agriculture in modifying the nat-
ural forest cover has been documented by other researchers.
Hartemink et al. ( 2008 ) attributed the high rate of forest
conversion to intensive agricultural plantations in the trop-
ical regions as largely due to the increasing population in
the region. Serneels ( 2001 ) discovered that changes in the
land cover of the Kenyan Embu Highlands were due to the
introduction of commercial plantations in the area which
resulted to a decrease in the natural vegetation cover.
The struggle to satisfy the basic human livelihood
demands is generally accepted as the main trigger behind
forest conversion in tropical areas (CIDA 2001 ). The rate of
current deforestation is alarming and remains a critical issue
regarding its implication for the global carbon cycle and
biodiversity. The annual deforestation rate in the area due to
plantation agriculture is 1.3 % which is greater than the FAO
( 1995 ) annual deforestation rate of 0.6 % in Cameroon.
Several studies carried out around the world also
revealed the negative impacts of plantation agriculture on
biodiversity loss. Koh and Wilcove ( 2008 ) looking at the
impact of oil palm agriculture on tropical biodiversity in
Malaysia and Indonesia acknowledged that oil palm plan-
tations in Malaysia and Indonesia have replaced forests and,
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