Volume 7, Issue 5, September 2019, Page: 162-167
On-Farm Tree Abundance and Biomass Carbon Stocks of Grevillea robusta and Eucalyptus saligna on Farms Around Kakamega Forest
Agevi Humphrey, Department of Biological Sciences, Moi University, Eldoret, Kenya; Department of Biological Sciences, Masinde Muliro University of Science and Technology, Kakamega, Kenya
Tsingalia Harrison, Department of Biological Sciences, Jaramogi Oginga Odinga University of Science and Technology, Kisumu, Kenya
Muyekho Francis, School of Agriculture and Veterinary Technology (SAVET), Masinde Muliro University of Science and Technology, Kakamega, Kenya
Obiri John, Department of Disaster Mitigation and Sustainable Development, Masinde Muliro University of Science and Technology, Kakamega, Kenya
Mukoya Wingred, Department of Geography, Masinde Muliro University of Science and Technology, Kakamega, Kenya
Onwonga Richard, Department of Land Resources Mapping and Agricultural Technology, University of Nairobi, Nairobi, Kenya
Received: Jul. 18, 2019;       Accepted: Aug. 14, 2019;       Published: Aug. 26, 2019
DOI: 10.11648/j.ajaf.20190705.11      View  208      Downloads  68
The integration of trees on farmlands has recently received attention due to their contribution to livelihoods improvement and climate change mitigation. They provide ecosystem services (ESs) like climate change mitigation, improvement of soil fertility, provision of timber and fuelwood among others. The choice of trees to plant depends on the role the farmer intends to put them into and the size of the farm. The trees can either be indigenous or exotic andare mostly planted along farm boundaries, in home gardens, as woodlots orientation among others. This study was conducted in western part of Kenya on farmlands that mostly border the Kakamega Forest. The study soughtto determine abundance, distribution and biomass carbon stocks of Grevillea robusta and Eucalyptus saligna for enhanced climate change mitigation. A total of (N=3,468) trees were inventoried in 80 farms with a total of 27.5ha. The average size of farms where the survey was done was about 1.28±1.01 ha. Eucalyptus saligna had a tree abundance 1133 (33%) of the total trees sampled while Grevillea robusta had 2,335 (67%). Two sites were purposively selected (Lubao and Tea zone area). In the Lubao site, Eucalyptus saligna abundance was 627 (29%) while Grevillea robusta abundance was 1565 (71%) of the total trees sampled. In Tea Zone site, Eucalyptus saligna abundance was 506 (40%) while Grevillea robusta tree abundance was 770 (60%). Total biomass estimated in the study area was 3.86±0.21Mgha-1(1.96Mg C ha-1). This was distributed as aboveground biomass (2.8±0.12Mgha-1) and belowground biomass (0.87±0.41Mgha-1). There was no significant difference in biomass among farms in Lubao (F=43.12; p=0.34) and in Tea zone sites (F=53.12; p=0.23). Lubao site had an estimated biomass of 1.97±0.023Mgha-1 distributed as above ground biomass (1.31±0.043Mgha-1) and below ground biomass (0.67±0.023Mgha-1). Tea zone site had an estimated biomass of 1.99±0.38Mgha-1. This was distributed as above ground biomass (1.58±0.023Mgha-1) and below ground biomass (0.40±0.18Mgha-1). Biomass was significantly different among the agroforestry practices in Lubao (F=13.1; p=0.002) and in Tea Zone (F=29.12; p=0.001). Hedgerow had the highest biomass among the agroforestry practices in Lubao (1.91±0.16Mgha-1) and in Tea zone sites (1.7±0.23Mgha-1). Alley cropping that was only practiced in Lubao had the least biomass (0.0044±0.009Mgha-1). The twotree species provided benefits for household use and at the same time for monetarysale. Firewood and timber were the most mentioned (n=80). This was followed by construction material and fencing material. These functions/uses were most preferred by the Eucalyptus grandis.
Biomass, Tree Abundance, Climate Change, Livelihoods
To cite this article
Agevi Humphrey, Tsingalia Harrison, Muyekho Francis, Obiri John, Mukoya Wingred, Onwonga Richard, On-Farm Tree Abundance and Biomass Carbon Stocks of Grevillea robusta and Eucalyptus saligna on Farms Around Kakamega Forest, American Journal of Agriculture and Forestry. Vol. 7, No. 5, 2019, pp. 162-167. doi: 10.11648/j.ajaf.20190705.11
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