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ENVIRONMENTAL MANAGEMENT & CONSERVATION

Assessing spatial patterns of forest degradation in dry Miombo woodland in Southern Tanzania

, & | (Reviewing editor)
Article: 1801218 | Received 23 Jun 2019, Accepted 21 Jul 2020, Published online: 07 Aug 2020

Figures & data

Figure 1. Map of the study area (green dots in the second figure show sample plots).

Figure 1. Map of the study area (green dots in the second figure show sample plots).

Table 1. Allometric equations used for AGB and volume

Figure 2. Overall share of tree cuttings for different purposes: (a) Number of stumps per ha (left) and (b) biomass (ton ha−1) (right).

Figure 2. Overall share of tree cuttings for different purposes: (a) Number of stumps per ha (left) and (b) biomass (ton ha−1) (right).

Figure 3. Representation of BA (m2ha−1), volume (m3ha−1) and biomass (ton ha−1) for fresh and old cuts in both areas.

Figure 3. Representation of BA (m2ha−1), volume (m3ha−1) and biomass (ton ha−1) for fresh and old cuts in both areas.

Table 2. Independent and dependent variable used for the analysis

Table 3. Comparison of mean ± standard error no ha−1, BA ha−1 and volume ha−1 in two areas

Table 4. Mean biomass estimated from four different allometric equations

Figure 4. Number of stumps per ha plotted against distance to forest edge (m).

Figure 4. Number of stumps per ha plotted against distance to forest edge (m).

Table 5. Logistic regression of forest degradation (presence or absence) with distance parameters in meters (df = 57)

Table 6. Relationship of stump cutting (number per ha) with distance parameters in meters

Figure 5. Basal area ha−1 plotted against distance to settlement (m).

Figure 5. Basal area ha−1 plotted against distance to settlement (m).

Figure 6. Percentage basal area removed plotted against distance to settlement (m).

Figure 6. Percentage basal area removed plotted against distance to settlement (m).

Table 7. Relationship of tree cuttings (basal area m2 per ha) with distance parameters (m)

Table 8. Percentage basal area removed per hectare regressed against distance parameters (m)

Figure 7. Availability of stumps removed for charcoal with respect to the distance from settlements in both areas.

Figure 7. Availability of stumps removed for charcoal with respect to the distance from settlements in both areas.

Table 9. Relationship of charcoal presence with respect to distance parameters (df = 57)

Table 10. Relationship of tree cutting for fuelwood with respect to the distance factors (df = 57)

Figure 8. Distribution of biomass removed (tons ha−1) for fuelwood and pole distance from settlements in both areas.

Figure 8. Distribution of biomass removed (tons ha−1) for fuelwood and pole distance from settlements in both areas.

Table 11. Relationship of tree cutting for poles with distance parameters (df = 57)