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Plant and Soil

, Volume 345, Issue 1–2, pp 211–221 | Cite as

Spatial pattern and variability in soil N and P availability under the influence of two dominant species in a pine forest

  • Alexandra Rodríguez
  • Jorge Durán
  • Felisa Covelo
  • José María Fernández-Palacios
  • Antonio Gallardo
Regular Article

Abstract

The presence of a legume in a nitrogen (N)-limited forest ecosystem may not only create “islands of N fertility” but also affect the phosphorus (P) availability. The main objective of this study was to compare the effect of a pine (Pinus canariensis) and a leguminous (Adenocarpus viscosus) species on the spatial pattern and variability of different labile organic-N (microbial biomass-N [MB-N] and dissolved organic-N [DON]), as well as inorganic-N (IN) and –P fractions (NH4-N, NO3-N, and PO4-P), in a forest soil of the Canary Islands (Spain). Assuming some litter quantity and quality differences between these two species, we expected to find higher soil labile organic-N concentrations under isolated individuals of P. canariensis than under isolated individuals of A. viscosus. We also expected to find higher concentrations and spatial dependence (percentage of total variance explained by spatial autocorrelation) of NO3-N beneath A. viscosus than beneath P. canariensis canopies, and higher spatial scaling of soil variables under the influence of P. canariensis canopies than under the presence of A. viscosus individuals. Moreover, we tested whether the soil variables measured under isolated individuals of both species showed a different spatial variability than the same soil variables measured under overlapping pine canopies inside a pine forest. To test these hypotheses, soil samples under isolated mature individuals of each species were collected in the winter and summer, whereas under a pine forest canopy, the sampling was performed only in the winter. The winter MB-N and DON concentrations were significantly higher beneath the pine individual, whereas the winter NO3-N, NO3-N-to-IN ratio, and PO4-P were significantly higher under the leguminous individual; these differences were not observed in the summer samples. We found higher spatial ranges under the pine than under the legume canopy in the winter sampling, and the spatial dependence of NO3-N was twice as high beneath the legumes as under the pines at both sampling dates. The soil spatial variability was higher (up to 17 times higher) under isolated individuals than inside the pine forest. The results of this study suggest that both the morphological and physiological characteristics of P. canariensis and A. viscosus, as well as the spatial pattern of P. canariensis, may influence the spatial pattern and variability of soil resources.

Keywords

Pinus canariensis Adenocarpus viscosus Microbial biomass-N Dissolved organic-N Inorganic-N Extractable-P 

Notes

Acknowledgments

This study was financed by the Ministerio de Ciencia y Tecnología of the Spanish government and by the grants REN2003-08620-C02-01 and CGL2006-13665-C02-01. Alexandra Rodríguez Pereiras was funded by a graduate student fellowship from the Galician (NW Spain) government. We thank Rocío Paramá, Rosana Estévez, Javier Méndez, Gustavo Morales and Feliciano Martínez for their assistance with the soil sampling and chemical analyses. We are grateful to Jesús Rodríguez and Jordan Jessop for their assistance. Local government authorities (Cabildo Insular de La Palma) provided us with lodging, four-wheel drive vehicles, and other facilities to perform the research on the island; we especially thank Félix Medina for his help with the field effort.

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Copyright information

© Springer Science+Business Media B.V. 2011

Authors and Affiliations

  • Alexandra Rodríguez
    • 1
  • Jorge Durán
    • 1
  • Felisa Covelo
    • 1
  • José María Fernández-Palacios
    • 2
  • Antonio Gallardo
    • 1
  1. 1.Department of Physics, Chemical and Natural SystemsPablo de Olavide UniversitySevilleSpain
  2. 2.Department of Parasitology, Ecology and GeneticsLa Laguna UniversityLa LagunaSpain

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