Soil nitrogen dynamics in a holm oak forest

Bonilla, David; Roda, Ferran Camas

doi:10.1007/978-94-017-2836-2_26

Cited by 2 publications

(2 citation statements)

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“…0.33 mM KNO3, 0.165 mM (NH4)2SO4 and 0.33 mM glycine). Inorganic N concentration was similar to that reported for Q. ilex forest soils (Bonilla and Rodá 1992) and soils in other Mediterranean ecosystems (Delgado-Baquerizo et al 2011).…”

Section: Plant Materials and 15 N Pulse Into The Soilsupporting

confidence: 86%

“…Mature forest soils often contain more NH4 + than NO3 -, thus forest species might preferentially take up NH4 + and grow better when NH4 + is the main N form (Metcalfe et al 2011). The dominant N forms in Mediterranean forest soils are organic N and NH4 + (Bonilla and Rodá 1992;Delgado-Baquerizo et al 2011). Plant species that coexist can also show different N-form preferences, with dominant species having higher NH4 + preference than subordinate ones (McKane et al 2002;Boudsocq et al 2012).…”

Section: Differences In N Acquisition and N Forms Preferences Between Speciesmentioning

confidence: 99%

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Root uptake of inorganic and organic N chemical forms in two coexisting Mediterranean forest trees

et al. 2017

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Background and aims: Plants differ in their ability to use different nitrogen (N) forms and these differences can be related to their ecology and drive community structure. The capacity to uptake intact organic N has been observed in plants of several ecosystems. However, soil organic N uptake by Mediterranean plants is unknown despite organic N being abundant in Mediterranean ecosystems. We compare the uptake of different N forms in two widespread coexisting Mediterranean forest trees with contrasting ecophysiological characteristics: Quercus ilex and Pinus halepensis.Methods: To estimate root uptake rate of each N form we used equimolar solutions (1 mM N) of 15 NO3 -, 15 NH4 + and 15 N-13 C glycine.Results: NH4 + and glycine were taken up at a similar rate, but faster than NO3in both species. Intact dual labeled glycine was found in both species, demonstrating that both species can absorb intact organic N.Conclusions: Despite their ecological differences, both species had similar preference for N forms suggesting no niche complementarity for N uptake. The higher preference for NH4 + and glycine over NO3possibly reflects adaptation to the differing proportions of N forms in Mediterranean soils.

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Section: Plant Materials and 15 N Pulse Into The Soilsupporting

confidence: 86%