Trees, 2018, Vol.32(5), pp.1443-1455
To access, purchase, authenticate, or subscribe to the full-text of this article, please visit this link: http://dx.doi.org/10.1007/s00468-018-1725-9 Byline: Jakob Sohrt (1), Cornelia Herschbach (2), Markus Weiler (1) Keywords: Nitrogen; Phosphorus; Foliar resorption efficiency; Foliar N:P ratio; Coniferous; Deciduous Abstract: Key message While there is evidence that foliar P concentration controls foliar P resorption efficiency, this is not found for N. Likewise, the foliar N:P ratio affects P, but not N resorption. Abstract This study focuses on foliar nutrient resorption efficiency, which describes the proportion of foliar nutrients that is resorbed before abscission. The two main tree types of temperate forests--deciduous and coniferous--are compared in this context. The aim of this meta-analysis is to describe the foliar resorption efficiency of N and P as a function of absolute and relative concentrations of these nutrients in mature foliage, which may serve as a proxy for the plants nutritional status. In addition to prior work on this subject which has focused mainly on single-nutrient resorption efficiency, the effects of relative- and absolute foliar N and P levels are decoupled and analyzed separately. P resorption efficiency was significantly higher at lower absolute foliar P concentration and strongly tied to the original foliar P concentration for both deciduous trees and conifers. In addition, a significant correlation between P resorption efficiency and the foliar N:P ratio was found for deciduous but not for coniferous trees. In contrast, the N resorption efficiency did not relate to the foliar N concentration, nor to the foliar N:P ratio for deciduous and coniferous trees. The results of this study provide strong evidence, that the decoupling of absolute and relative N- and P concentrations in mature foliage is a critical factor for assessing the effect of relative N:P nutrition on nutrient resorption from foliage. If the statistical dependency among absolute and relative foliar N and P concentrations is not considered, the effect of relative N:P nutrition on single nutrient resorption efficiency is likely over-estimated. Overall the results point towards trees of temperate forests being P limited rather than N limited. Author Affiliation: (1) grid.5963.9, Albert Ludwigs University of Freiburg, Friedrichstra[sz]e 39, 79098, Freiburg, Germany (2) grid.5963.9, Albert Ludwigs University of Freiburg, Georges-Kohler-Allee 53/54, 79110, Freiburg, Germany Article History: Registration Date: 16/06/2018 Received Date: 17/02/2018 Accepted Date: 15/06/2018 Online Date: 21/06/2018 Article note: Communicated by H. Rennenberg. Electronic supplementary material The online version of this article (https://doi.org/10.1007/s00468-018-1725-9) contains supplementary material, which is available to authorized users.
Nitrogen ; Phosphorus ; Foliar resorption efficiency ; Foliar N:P ratio ; Coniferous ; Deciduous
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