The vulnerability to future disturbance is determined by dynamic factors that drive landuse change; principally market demand, new technologies or climatic shifts.
Equally important are the constraints to landuse change; such as the intrinsic and static nature of the landscape itself, the soils and topography, and the social dynamic of tenure.
All factors have, are, and will continue to interact, changing both rapidly and slowly over decades. Only tenure, the critical social control of landuse, was considered here; and for both the ILZ and ELZ combined.
The assessment was focused on tenure vulnerability and was based on the relative distribution of the area of each landcover type between the tenure types set out in Table 4. The six tenures listed in this Table offer different levels of protection against future disturbance ranging from none, with Freehold, to total protection with Conservation tenure. A numeric measure was computed as the mean of the sum of the products of the percentage area in each of the six tenure classes of Table 4 and their protection ratings (0-5). Based on this value, a vulnerability rating and score was arbitrarily but plausibly set as low (* , > 50% protected), moderate (** , 25-50% protected), and high (*** , < 25% protected).
Table 15: The distribution of relative area (%) of the six tenure levels for all landcover types within the ILZ and ELZ. The score was based on the mean sum of the products of the percentage areas and the tenure protection ratings that are lowest with tenure type 1 and highest with tenure type 6.
Tenure type
1 2 3 4 5 6 Score
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xTML4 40 6 25 3 4 23 **
eTML3 49 9 23 10 0 10 ***
wTML3 71 27 1 1 0 1 ***
xTML3 65 13 9 5 0 7 ***
eM2 52 26 4 8 7 4 ***
wM2 20 80 0 0 0 0 ***
xM2 53 18 22 7 0 0 ***
eL2 23 47 2 19 3 6 **
wL2 36 39 1 7 9 8 ***
xL2 9 77 1 6 2 5 ***
eM1 40 58 1 0 0 1 ***
eL1 3 51 2 18 21 6 **
wL1 12 69 1 2 7 9 **
xL1 7 43 1 33 12 4 **
eS3 98 0 1 0 0 2 ***
wS3 35 28 1 1 28 8 **
xS3 39 2 1 0 50 8 **
eS2 43 16 1 5 12 23 **
wS2 0 64 1 15 15 4 **
xS2 52 22 1 1 7 17 ***
eS1 12 28 2 32 18 7 **
wS1 1 32 1 31 28 6 **
xS1 1 76 1 6 7 9 **
xZ3 27 19 9 12 3 31 **
xZ2 6 65 1 6 11 10 **
wZ1 2 95 0 2 0 1 ***
xH2 0 49 1 20 15 14 **
xG4 12 26 6 43 0 13 **
xG3 45 47 4 1 1 1 ***
xG2 2 95 0 0 0 3 ***
Littoral 5 56 2 22 9 5 **
xG1 0 79 1 6 0 13 **
xF1 0 84 0 0 0 16 **