Root biomass distribution in a moist tropical montane forest |
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| Authors: | E D Vance N M Nadkarni |
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| Institution: | (1) Land, Air and Water Resources, University of California, 95616 Davis, CA, USA;(2) Present address: Institut de Recherches du Café et du Cacao, B.P. 2577, Yaoundé, Cameroon, West Africa |
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| Abstract: | Effects of N sources (ammonium, nitrate and ammonitrate) and VA mycorrhizae (Glomus intraradices) on rhizosphere soil characteristics (pH, exchangeable acidity, exchangeable cations, inorganic N concentrations) growth and nutrient acquisition of coffee seedlings (Coffea arabica L. cv guatemala) were investigated in a pot study with an acid soil (Red Bluff Loam) sterilized by autoclaving. Ammonium addition decreased rhizosphere pH while nitrate and ammonitrate additions both increased rhizosphere pH. Mycorrhizae induced a higher pH, a lower exchangeable acidity and higher values of exchangeable cations in the rhizosphere. Ammonium addition resulted in a lower mycorrhizal infection than the two other N sources. Mycorrhizal plants grew better and accumulated more N, Ca and Mg than non-mycorrhizal plants. |
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| Keywords: | ammonium ammonitrate Coffea arabica L Glomus intraradices nitrate nutrient uptake pH rhizosphere vesicular arbuscular mycorrhizae |
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