Interactive effects of Quantum flux, Transpiration rates and Leaf stomata conductance on net CO2 Assimilation rates of Savannah grasses in Kenya

  • Dr. Elias K. Maranga Egerton University, P.O Box 536-20115, Egerton, Kenya
Keywords: Acacia tortilis,, Panicum maximum, net CO2, assimilation rates, savannah, environmental fluxes, productivity

Abstract

The current study was conducted to investigate the interactive effects of quantum flux, transpiration rates, and
leaf stomata conductance on net CO2 assimilation rates of Panicum maximum beneath Acacia tortilis canopies
and disturbed micro sites where these trees were removed. A randomized complete block design was used to
measure the treatment effects created by cutting Acacia tortilis trees on CO2 assimilation rates of Panicum
maximum. The mean quantum fluxes for the canopy micro sites and disturbed micro sites were 694.8µmol m-2
s
-
1 and 1184.5µmol m-2
s
-1
, respectively. The average leaf stomata conductance values for Panicum maximum in
the exposed and canopy micro sites were 249.6 mmolm-2
s
-1
and 332.8mmol m-2
s
-1
respectively. These average
leaf stomata conductance values were significantly different at p≤ 0.05 Transpiration means for Panicum
maximum in the exposed micro sites (4.0 mgcm-2
s
-1
) and canopy micro sites (4.2mg cm-2
s
-1
) were not
significantly different at P≤ 0.05. Panicum maximum in the disturbed micro sites exhibited significantly lower
(p≤0.05) net CO2 assimilation rates (mean of 1.4µmolCO2 m-2
s
-1
) than the rates measured for the same species
(mean of 9µmolCO2 m-2
s
-1
) in the canopy micro sites.
These findings suggest that induced disturbances created by clearing of Acacia tortilis trees in the long term
will cause shifts in micro environmental fluxes of energy, water and CO2 exchange with significant implications
on herbaceous under storey productivity.

Author Biography

Dr. Elias K. Maranga, Egerton University, P.O Box 536-20115, Egerton, Kenya

Senior Lecturer/Consultant, Natural Resources Ecology &Microclimatology, Department of Natural
Resources,

Published
2016-10-31
How to Cite
Maranga, D. E. K. (2016, October 31). Interactive effects of Quantum flux, Transpiration rates and Leaf stomata conductance on net CO2 Assimilation rates of Savannah grasses in Kenya. EPH - International Journal of Biological & Pharmaceutical Science (ISSN: 2208-2166), 2(10), 01-16. Retrieved from https://ephjournal.com/index.php/bps/article/view/53