Growth and mineral nutrition of the native trees Pollalesta discolor and the N-fixing Inga densiflora in relation to the soil properties of a degraded volcanic soil of the Ecuadorian Amazon |
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Authors: | Davidson Robert Gagnon Daniel Mauffette Yves |
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Institution: | 1.Research and Development Division, Biod?me de Montréal, 4777 Pierre-De Coubertin, Montréal, (Québec), Canada, H1V 1B3 ;2.Groupe de recherche en écologie forestière interuniversitaire, Université du Québec à Montréal, C.P. 8888, succ. Centre-ville, Montréal, (Québec), Canada, H3C 3P8 Fax ; |
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Abstract: | Land reclamation in the humid tropics, using native tree plantations, requires a better knowledge of plant-soil interactions,
and of patterns of growth of several poorly known species. We examined the establishment and mineral nutrition of two early-successional
native tree species, Inga densiflora (N-fixing) and Pollalesta discolor, in relation to properties of a degraded Hydrandept
volcanic soil in Ecuadorian Amazon. Initial content of organic matter was the most significant soil variable in explaining
the growth of pure stands of both species and was strongly related to effective cation exchange capacity (ECEC) and to net
total N mineralization. Leaves of Pollalesta discolor had greater concentration of nutrients than Inga densiflora, which led
to a litter-layer rich in nutrients. Deficient concentrations of foliar P, detected on plots with low soil organic matter,
were linked to poor growth of Inga densiflora, and indicate that this species may be P-limited. The inclusion of Inga densiflora
did not stimulate the growth of Pollalesta discolor in mixed stands. This study indicates that soil organic matter management
is an important issue on these degraded volcanic soils. We suggest that a reduction of the pool of labile organic matter appears
to hamper tree productivity through a nutrient shortage. The high variability of the degraded soil studied proved to be an
obstacle to tree growth and establishment.
This revised version was published online in July 2006 with corrections to the Cover Date. |
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Keywords: | Foliar nutrients Hydrandept mineralization silviculture soil organic matter tropical trees |
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