13
Figure 5 Forest Cover Change within 50 m Buffer, 1990 – 2010
Source: Spatial Solutions 2015 Based on Forestry Commission ’s Land Cover Data
3.3 Land Cover Composition within 2.5 km Buffer Study Area, 1990 – 2010
There are striking differences in land cover dynamics and patterns in the study area as compared with that within the 50 meter buffer. First, in 1990, unlike the latter
– which was more of an equal split between forest and wet lands -, the study area was about 90 percent
forest. As spatially shown by figure 3.4, with the exception of the eastern parts of Ezoni Suaso
– which was dominantly wetlands -, the forest cover in 1990 was found almost everywhere in the study area.
Wetlands, the second largest land cover in 1990, accounted for about 5 percent 4.4 km
2
of the study area whereas settlements absorbed the least share of 0.2 percent 0.2 km
2
. In addition to the concentration in Ezoni Suaso area, wetlands were largely found along
Ankobra as it assumed the River’s shape. Among the selected study communities, only Kukoavile had significant settlement cover in 1990.
14
Figure 6 Land Cover Composition in the Study Area, 1990 and 2010
Source: Spatial Solutions 2015 Based on Forestry Commission ’s Land Cover Data
In 2010, the two land cover types that best represent mangroves declined. Forest cover fell in share of land area from 90 to about 70 percent as over 17 km
2
were lost. The annual rate of decline of forestlands stood at 1.1 percent over the period as shown by table 3.2. Generally,
from figure 3.4, the fall in forest cover is more visible in areas with settlements especially, between Eziome, Eshiem and Kukoavile; west and southern parts of Yiyibunli; between
Adiasuaso and Eziome; and around Sawoma and Awona.
The monumental loss of forest cover is attributable to several factors but of interest is the logging of mangroves. Mangroves logging do not only account for wetlands decrease but as
well forestland decline.
Contrary to the general increase in wetlands within the 50 meter buffer, over 2 km
2
were lost in the study area in 2010. The land cover fell rapidly than forestlands as it recorded annual
decline rate of -3.3 percent during the two decades. Notably, the huge concentration of wetlands in the western parts of Ezoni Suaso was lost in 2010. Again, pockets of wetlands to
the south of Yiyibunli and northern part of Awona diminished during the two – decade
interval.
15
Figure 7 Land Cover Composition and Change in the Study Area
Source: Spatial Solutions 2015 Based on Forestry Commission ’s Land Cover Data
Croplands, grasslands and Settlement cover on the hand increased. The increase in croplands was particularly striking as the land cover jumped from occupying the least but one share 0.7
percent of land area in 1990 to the second largest 14.5 percent in 2010 and in the process, gained close to 13 km2 of lands previously held by other land cover types. The annual rate of
growth in croplands is even more imposing. Over the period, the land cover grew at an accelerated pace of above 16 percent annually. From figure 3.4, cropland increase is observed
along wetlands and around settlements. However, significant concentration of the increase is found between Kukoavile, Eziome and Eshiem as well as the west and southern areas of
Yiyibunli. The study area, a zone designated as nature reserve in the Spatial Development Frameworks SDFs of the two districts Nzema East and Ellembelle is thus fast turning into
farmlands. Again, this practically demonstrates how at the local level, the quest for survival livelihoods conflicts the preservation of the natural environment or ecosystem.
Grasslands which as pointed out earlier from local knowledge can be seen as a function of croplands also grew rapidly at an annual rate of 6 percent. With about 6.4 km2 gains, the land
cover increased its share of land area from a little over 3 percent in 1990 to a tenth in 2010. Grassland increase is particularly found between Sawoma and Yiyibunli, along the wetlands
and western part of Ezoni Suaso, an area which was formerly occupied by wetlands.
The two decades also witnessed expansion of existing settlements and proliferation of new ones. As spatially presented by figure 3.4, settlement expansion is notable in Sanwoma and
Kukoavile. In all, settlement cover grew significantly at 2.8 percent annually, gaining over about 0.2 km2 of land at the expense of the marine ecosystem.
Table 2 Summary of land Cover Composition and Change in the Study Area
Area km
2
Change km
2
Share AGR
1990 2010
1990 2010 Wetland
4.38 2.25
-2.13 4.72
2.42 -3.28
Forestland 84.85 67.69
-17.16 91.27 72.74 -1.12
Cropland 0.66
13.50 12.84
0.71 14.51 16.31
Settlement 0.21 0.37
0.15 0.23
0.40 2.77
Grassland 2.86 9.25
6.39 3.08
9.94 6.05
93 93
100 100
Source: Spatial Solutions 2015 Based on Forestry Commission ’s Land Cover Data
20 40
60 80
100
Forestland Wetland
Grassland Cropland
Settlement Perc
e n
t
Land Cover 1990
2010
16
3.4 Wetlands Change and Distance from Ankobra River
