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1 June 2005 Nitrogen mineralization in epiphytic soils of an old-growth Fitzroya cupressoides forest, southern Chile
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Abstract

Epiphytic soils derive from organic matter accumulation on trunks and canopy branches of large trees. We compared chemical and physical properties, rates of net N mineralization, and bacterial biomass carbon associated with epiphytic soils and the forest floor of an old-growth, temperate forest dominated by the long-lived Fitzroya cupressoides (Cupressaceae) in Chiloé Island, southern Chile. Epiphytic soils had lower density, higher moisture content, higher total carbon and nitrogen contents, and lower pH than forest floor; however, these differences were only slight. Microbial biomass and soil C/N ratios did not differ between soil types. We estimated similar N mineralization rates in epiphytic soil and in the forest floor, but there was a significant interaction between time of the year and soil type, resulting from higher N production in epiphytic soils in some months. Microbial net N mineralization in the epiphytic layer contributed ca 6% of the internal N circulation. Fitzroya trees may access these nutrients via adventitious root uptake and leaching to the forest floor, thus exploiting an alternative path of nutrient circulation in old-growth forests.

Cecilia A. Pérez, Rafael Guevara, Martín R. Carmona, and Juan J. Armesto "Nitrogen mineralization in epiphytic soils of an old-growth Fitzroya cupressoides forest, southern Chile," Ecoscience 12(2), 210-215, (1 June 2005). https://doi.org/10.2980/i1195-6860-12-2-210.1
Received: 10 June 2004; Accepted: 1 December 2004; Published: 1 June 2005
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