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Morphological Trait Difference, Growth and Ecophysiological Performance of Mikania micrantha Grown Under Contrasting Light and Nutrient Regimes

Ghale, Bimal
Master thesis
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URI
http://hdl.handle.net/11250/187023
Date
2013-08-06
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  • Master's theses (INA) [593]
Abstract
Mikania micrantha , a world’s worse weed, is rapidly expanding throughout the subtropical and tropical parts of Asian countries. Abundant growth and development of

Mikaniavines make them dominant over introduced habitat and causes significant damage to

native floras, faunas and entire ecosystems. To investigate the role of environmental

resources associated with its rapid growth and development, Mikania seedlings were grown

at green house chamber by manipulating two levels of light and nutrient for 110 days. Total

thirteen harvests had performedthroughout the study period on the weekly basis. Specific leaf

area, leaf area ratio, leaf weight ratio, root weight ratio, relative growth rate, net assimilation

rate and total biomass of seedlings grown under light and nutrient treatments were measured

in each harvest. Photosynthetic performance of mature and fully grown Mikania seedlings

was measured at 9th and 11th harvests. Mikania seedlings grown under full sun light and

nutrient rich soil had allocated greater amount of total leaf area and total chlorophyll content

capturedthe higher intensities of solar irradiances to attain maximum photosynthetic rate. Due

to opportunistic capture and utilization of more resources for their physiological process and

morphological allocation patternthe seedlings grown under full sun light with nutrient rich

soil achievedcomparatively higher degree of net assimilation rate (NAR)and relative growth

(RGR) than the seedlings grown at resource limited treatments. The seedlings grown under

full sun light andnutrient rich soil had attained maximum biomass performance indicating the

interaction effect between full light and high soil nutrient resources. Mikaniaseedlings grown

under resource limited treatments had observed poor growth performance however these

seedlings modified their morphological allocations such as

higher specific leaf area and leaf area ratio to assimilatemore resources from the existing

environment. The abilities of Mikania to tolerate adverse environmental conditions and

efficiently utilize higher intensities of sun light and soil nutrient to increase overall

performance and greater proportion of biomass allocation on aboveground parts make them

to grow dominantly over the introduced habitat.
Publisher
Norwegian University of Life Sciences, Ås

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