Flora Biodiversity Assessment in Bonga, Boginda and Mankira Forest

More documents

Recommendations

Info

most important species (>=10cm dbh) in each forest area which have IVI greater than 10 are presented in the following Table (Table 11). Table 11. Important species in Mankira, Bonga and Boginda Mankira Bonga Boginda Croton macrostachyus (26) Draceaena steudneri (17) Chionanthus mildbraedii (17) Phonix reclinata (21) Schefflera volkensii (15) Milletia ferruginea (17) Sapium ellepticum (21) Schefflera abyssinica (14) Prunus Africana (15) Celtis africana (13) Milletia ferruginea (10) Olea welwitschii (14) Vepris dainelli (13) Olea welwitschii (10) Macaranga capensis (13) Cordia africana (12) Schefflera abyssinica (12) Cachno (10) Landolphia owerensis (12) Diospyrose abyssinica (10) Syzygium guineense (12) Milletia ferruginea (10) Vepris dainelli (10) Chionanthus mildbraedii (10) Allophyllus abyssinicus (10) Sapium ellepticum (10) Pouteria adolfi-friederici (10) Surprisingly, except for Dracaena afromontana, D. steudneri and Bersama abyssinica, all species indicated in the Table 10 are expressed as important species by Getachew Berhane and Yoseph Assefa in IBC, 2002. Species that are not characterized as important but found to be important in this study are Syzygium guineense, Allophyllus abyssinicus, Sapium ellepticum, Landolphia owerensis and Olea welwitschii. In general, with regard to forest in the study area, it is hardly possible to separate or to map distinctively different communities as most of the tree species are overlapping. Community type may be classified based on three systems viz. physiognomic, floristic and dynamic system 10 . Despite the fact that we talk about one community type, as Friis (1994) categorized it - Afromontane Rain Forest- for this particular site floristic classification is chosen and “association” where naming is made based on the basis of common dominant species in several stands (Mankira, Bonga and Boginda in this case). Accordingly, in Bonga forest Draceaena steudneri and Schefflera volkensii; in Mankira forest Croton macrostachyus, Phonix reclinata and Vepris dainelli; and in Boginda Milletia ferruginea, Chionanthus mildbraedii and Macaranga capensis are found to be 10 Based on Lecture note on “General Ecology”, Wondogenet College of Forestry 55
common and dominant species. The associated trees are overlapping especially between in Bonga and Boginda forest. The overlapping of species in Bonga, Mankira and Boginda forest is expressed in Jaccard’s index and Sørensen's Index (Table 12). Table 12. Biodiversity Indices of trees/shrubs and lianas greater or equal to 10cm dbh Biodiversity Indices Bonga Mankira Boginda Margalef 8.34 7.36 10.82 Menhinick’s 2.25 2.16 2.88 Shannon 3.13 3.06 3.27 Evenness 0.79 0.80 0.77 Simpson 0.03 0.04 0.04 Berger-Parker 0.08 0.09 0.13 Jaccard's index (site Boginda and Bonga forest) 52.33 Jaccard's index (site Boginda and Mankira) 57.14 Jaccard's index (site Bonga and Mankira forest) 40.24 Sørensen's Index (site Boginda and Bonga forest) 73 Sørensen's Index (site Boginda and Mankira) 72 Sørensen's Index (site Bonga and Mankira forest) 57 From the above Table it is possible to observe Shannon index between the three forests is comparable, 3.13, 3.06 and 3.27, consecutively. Index of Similarity according to Jaccard is a very simple mathematical expression for the similarity of plant communities and is expressed by Community coefficient of Jaccard (Mueller-Dombois and Ellenberg, 1974). It is based on the presence-absence relation between the number of species common to two areas (or communities). Accordingly, similarity of the three forests is estimated and the result is shown in Table 12 above. In general, the similarity between the three forests is not that much strong. But Sørensen's Index indicates stronger similarity than Jaccard’s Index. According to Mueller-Dombois and Ellenberg, 1974 Sørensen's Index is mathematically more satisfactory as it includes a statistically probability term and also it gives greater weight than Jaccard’s to the species that recur in the two test areas than to those that are unique to either area (see the formula below). IS J C = * 100 Jaccard (=J) Based on presence of species only. a + b + C 56
Page 1 and 2:
Flora Biodiversity Assessment in Bo
Page 3 and 4:
Table 9. Density of trees/shrubs pe
Page 5 and 6:
Acronyms AAU Addis Ababa University
Page 7 and 8:
highly disturbed forest). In genera
Page 9 and 10: species. As a result of this phenom
Page 11 and 12: thatches collected from the forest
Page 13 and 14: had done by different authors not m
Page 15 and 16: 035 0 54.580` to 036 0 14 .570`E Lo
Page 17 and 18: 2.12 An attempt was made to collect
Page 19 and 20: Figure 1. Estimated Landcover of Bo
Page 21 and 22: Table 2. Estimated area of each lan
Page 23 and 24: specious, Macaranga capensis, Sapiu
Page 25 and 26: ferruginea, Phytolacacca dodecandra
Page 27 and 28: Figure 5. Regeneration in Boginda S
Page 29 and 30: Olea welwitschii, Oncinotis tenuilo
Page 31 and 32: 3.3.4 Herbaceous plants A. Bonga fo
Page 33 and 34: Figure 10 Herb species of Boginda 3
Page 35 and 36: Mankira Recorded climbers in Mankir
Page 37 and 38: C. Boginda Olyra latifolia, Poecilo
Page 39 and 40: Albizia gummifera, Dracaena fragran
Page 41 and 42: 3.3.5 Comparison of Forest areas (B
Page 43 and 44: Within each study area the total pl
Page 45 and 46: specific endemics than the Afromont
Page 47 and 48: The forests are also in the process
Page 49 and 50: 4.3. Vegetation According to A. Aal
Page 51 and 52: Chaffey reported that in Kaffa prov
Page 53 and 54: 2002 recorded very low number of se
Page 55 and 56: 4.3.5 Total Values of Bonga, Bogind
Page 57 and 58: Class Bonga Boginda Mankira A=I 65
Page 59: Table 10. Common species in Mankira
Page 63 and 64: 5. PROPOSAL FOR CORE, BUFFER AND TR
Page 65 and 66: is made entirely based on landcover
Page 67 and 68: 6. REFERENCE Anonymous, (1999). For
Page 69 and 70: Resources Management & Regulatory D
Page 71 and 72: soil resources, to the maximum exte
Page 73 and 74: Scientific Name Family Habit Diospy
Page 75 and 76: Scientific Name Family Habit Salaci
Page 77 and 78: No. Scientific name Family Habit 30
Page 79 and 80: Table 17. Common, Occasional and Ra
Page 81 and 82: Table 18. Species found within one
Page 83 and 84: Photo 3. Forest conversion for agri
Page 85: Annex V. Transect Location Figure 2
show all

Flora Biodiversity Assessment in Bonga, Boginda and Mankira Forest

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?