Effects of exotic plantation expansion and management intervention on woody plant species diversity, regeneration and soil seed bank in Tarmaber district, Ethiopia

Authors

  • Melese Bekele Amhara Agriculture Research Institute
  • Dessie Assefa Bahir Dar University
  • Yohannis Gebremariam Gondar University

Keywords:

Floristic diversity, Management intervention, Natural forest, Plantation forest, Soil seed bank

Abstract

This study was carried out to determine the effect of plantation forest with management intervention on woody plant species diversity in Tarmaber district north shewa zone Ethiopia, regeneration and soil seed bank species composition in five different forest types. A total of 75 circular sample plots of 314 m2 were established along a transect lines. Soil seed bank analysis was done from soil samples collected in each of the plots (225 samples). Different diversity index and ANOVA was used in SPSS software for analysis. The result showed that a total of 51 woody plant species was recorded in adjacent natural forest (41), managed C. lusitanica (27), not managed C. lusitanica (9), managed E. globules (22) and not managed E. globules (13) species. Regeneration of seedlings were 3538, 5567, 707, 1462 and 2524 mean stems ha-1 for natural forest, managed C. lusitanica, not managed C. lusitanica, managed E. globules and not managed E. globules respectively. Unmanaged C. lusitanica plantations had significantly lower densities of mature tree stems ha-1 as compared to managed C. lusitanica, managed E. globules and adjacent natural forest (F=14.03, p<0.05). Similarly in terms of sapling density ha-1 unmanaged C. lusitanica was significantly lower from other forest types (F=7.37, p <0.05). However managed C. lusitanica had significantly higher seedling regeneration (stem density ha-1) than other plantation and adjacent natural forests (F = 16.11, p < 0.05). Generally mean stem densities including tree, sapling and seedling of woody species among different forest types managed C. lusitanica was significantly higher among different forest types (F= 13.01, p<0.05). From the soil seed bank a total of 22 plant species (20 native and 2 exotic) species were recovered. In different forest types the number of species recorded was in adjacent natural forest (19), managed C. lusitanica (11), unmanaged C. lusitanica (4), managed E. globules (7) and unmanaged E. globules (5). Generally with appropriate management intervention undergrowth vegetation and soil seed bank status in plantation forest had good species composition and diversity.

Author Biographies

Melese Bekele, Amhara Agriculture Research Institute

Amhara Agriculture Research Institute, Debre Birhan Agriculture Research Center, Ethiopia

Dessie Assefa, Bahir Dar University

Department of Natural Resource and Environmental Science, Bahirdar University, Ethiopia

Yohannis Gebremariam, Gondar University

Department of Forestry and Environmental Science, Gondar University, Ethiopia

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Published

2021-06-30

How to Cite

Melese Bekele, Dessie Assefa, & Yohannis Gebremariam. (2021). Effects of exotic plantation expansion and management intervention on woody plant species diversity, regeneration and soil seed bank in Tarmaber district, Ethiopia. Berhan International Research Journal of Science and Humanities, 5(1), 101–134. Retrieved from http://journals.dbu.edu.et/index.php/birjsh/article/view/88