small-holder timber production: tree inventories/biomass surveys international workshop
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small-holder timber production: tree inventories/biomass surveys international workshop
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small-holder timber production: tree inventories/biomass surveys international workshop
- 1. SMALL-HOLDER TIMBER PRODUCTION: TREE INVENTORIES/BIOMASS SURVEYS INTERNATIONAL WORKSHOP ON SMALL-HOLDER TIMBER PRODUCTION ICRAF HOUSE 29 TH NOVEMBER 2004 PAUL M. NJUGUNA
- 9. Comparison between 1993 and 1998 inventories 17.07m 3 7.5m 3 Usable Vol/farm (30% of Vol/ha) Up 107% 19.9m 3 9.6m 3 Vol/Ha Up 128% 56.9m 3 25m 3 Vol/farm Up 59% 397 250 Trees/Ha Up 73% 1137 656 Trees per farm difference 1998 1993
- 12. Tree shapes used for Farm based Surveys..(1,2, 3, 4) Computing usable volume (stem volume from stump to tip) ln(v)=a+b ln(d) V-usable volume (dm3) D-diameter at breast height (cm) a ad b are constants constants and are for different tree forms Tree type parameter (a) Parameter(b) Source 1 -2.2945 2.5703 Laasasenaho 1982 2 -1.7322 2.3992 Pukkala 1989 3 -1.6493 2.3567 Pukkala 1989 4 -1.6840 2.2406 Pukkala 1989 Equations used to calculate tree volumes and constant for the four form factors used .
- 14. Grevillea Boundary Planting in Giaki Area-Meru Central Silvicultural Operations such as thinning not done since the tree were not meantfor timber production at initiation .
- 15. Splitting of Grevillea logs using Powersaws- Kigane Village, Meru Central
- 17. TREE USES Use No. of stems Volume (m3) Fuelwood 1448 298.651 Charcoal 15 8.641 Fruit tree 547 17.083 Herbal 45 197.751 Timber 3032 1,295.250 Honey 16 16.446 Fodder 13 11.767 Carving 93 47.949 Others 186 17.417 5395 1,910.955 Some findings from on farms biomass surveys- Timber Marketing Programme
- 18. DISTRIBUTION OF DBH CLASSES DBH CLASS No. of stems Volume (m3) 1 - 5 1325 4.867 6 - 10 725 20.406 11 - 15 662 60.019 16 - 20 682 131.904 21 - 25 592 195.630 26 - 30 642 368.316 31 - 35 252 201.030 36 - 40 240 278.350 41 - 45 125 193.486 >45 150 456.947 5395 1,910,955 Some findings from on farms biomass surveys- Timber Marketing Programme
- 19. Growing place No. of stems Volume (m3) Homestead 289 120.543 Border 2733 941.808 Grazing 212 90.816 Cropland 1939 698.951 Home garden 53 17.008 Woodlot 83 16.925 Woodland 86 24.905 5395 1,910.955 Some findings from on farms biomass surveys -Timber Marketing Programme
- 20. DISTRIBUTION OF AGE CLASSES Age class No. of stems Volume (m3) < 6 2080 46.974 6 - 10 1081 213.202 11 - 15 1269 568.629 15 - 20 602 501.173 21 - 25 95 104.086 26 - 30 169 191.677 > 30 99 285.216 5395 1,910.955 Some findings from on farms biomass surveys -Timber Marketing Programme