Growth responses of
light demanding and shade tolerant peat swamp forest saplings to elevated CO2
M.S. Nizam1,3, C.M.Z. Che Radziah1 and W.A. Wan Juliana2*
Biological Sciences and Biotechnology, Faculty of Science and Technology,
Universiti Kebangsaan Malaysia, Bangi, 43600, Malaysia
Earth Sciences and Environment, Faculty of Science and Technology, Universiti
Kebangsaan Malaysia, Bangi, 43600, Malaysia
Climate Change, Universiti Kebangsaan Malaysia, Bangi, 43600, Malaysia
4School of Biology,
Faculty of Applied Sciences, Universiti Teknologi MARA Pahang, Jengka, 26400,
*Corresponding Author Email : firstname.lastname@example.org
To determine the growth responses of two peat swamp forest species, Shorea
platycarpa, a shade-tolerant slow-growing species and Macaranga
pruinosa, a light-demanding fast-growing species under elevated
atmospheric CO2 concentration.
Methodology: The saplings of both species were grown in a shade
house at ambient (400±50 µmol mol-1) and in an open roof
ventilation greenhouse at elevated atmospheric CO2 concentration
800±50 µmol mol-1 for seven months. The temperature in both
environments ranged between 25-33°C with 55–60% sunlight
transmittance and the saplings were thoroughly watered twice a day. Plants
growth measurements were estimated at frequent intervals. Saplings biomass
characteristics were examined using destructive methods after seven months of
treatment and non-destructive method was used for determination of leaf area.
Elevated CO2 enhanced all the growth characteristics in M.
pruinosa with a significant increase was observed particularly on both
height and diameter relative growth rate and biomass characteristics. The
height relative growth rate and leaf area were significantly reduced under
elevated CO2 in S. platycarpa but did not affect the shoot
or root diameter and biomass significantly. A positive correlation (r =0.77,
p>0.05) between stem biomass and basal diameter for plants under elevated
CO2 was recorded for M. pruinosa, but not in S. platycarpa.
Both species showed negative correlation (S. platycarpa; r = -0.53, M.
pruinosa; r = -0.46, p>0.05) between stem growth and stem biomass at
Interpretation: These results unveiled profound effects
of elevated CO2 on the growth of light-demanding species M.
pruinosa, while shade-tolerant species S. platycarpa was not
relatively affected by elevated CO2. This underscored the
necessity to analyse different species performance to elevated CO2,
thereby improving the ability to predict tropical swamp forest ecosystem
responses to rising CO2.
Carbon-di-oxide, Growth responses, Macaranga pruinosa, Peat swamp
species, Shorea platycarpa
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