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KMID : 0368420100530010061
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Journal of Plant Biology
2010 Volume.53 No. 1 p.61 ~ p.69
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Comparison of Nitrogen Fixation for North- and South-facing Robinia pseudoacacia Stands in Central Korea
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Noh Nam-Jin
Son Yo-Whan
Koo Jin-Woo
Seo Kyung-Won
Kim Rae-Hyun
Lee Yoon-Young
Yoo Kyung-Seun
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Abstract
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The nitrogenase activity, root nodule biomass, and rates of nitrogen (N) fixation were measured in 25-year-old pure north- and south-facing Robinia pseudoacacia stands in an urban forest of Seoul (Kkachisan Mountain) in central Korea. The nitrogenase activity was estimated using an acetylene reduction (AR) assay, which showed an increasing trend during the early growing season, with sustained high rates from June through to September with a decrease thereafter. July had the highest nitrogenase activity rate (micromoles C2H4 per gram dry nodule per hour), averaging 95.8 and 115.1 for the north- and south-facing stands, respectively. The maximum root nodule biomass (kilograms per hectare) was 45.7 and 9.1 for the north- and south-facing stands in July, respectively. The AR rate appeared to be strongly correlated to the soil temperature (r 2?=?0.68, P?
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KEYWORD
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Acetylene reduction, Aspect, Nitrogen fixation, Nodule biomass, Robinia pseudoacacia
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