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The Phosphorus Economy of Mediterranean Oak Saplings Under Global Change. | LitMetric

The Phosphorus Economy of Mediterranean Oak Saplings Under Global Change.

Front Plant Sci

Plant Ecology, Albrecht-von-Haller Institute for Plant Sciences, University of Göttingen, Göttingen, Germany.

Published: April 2019

AI Article Synopsis

Article Abstract

While a severe decrease in phosphorus (P) availability is already taking place in a large number of ecosystems, drought and nitrogen (N) deposition will likely further decrease the availability of P under global change. Plants have developed physiological strategies to cope with decreasing P resources, but it is unclear how these strategies respond to elevated N deposition and summer droughts. We investigated the influence of N and P availability and soil drought on P uptake (H PO feeding experiment) and use efficiencies in young Webb. trees. We hypothesized that (H1) the expected increases in soil N:P ratios will increase the efficiencies of P uptake and use of oak saplings but will decrease the efficiencies of N uptake and use, whereas (H2) drought will affect P uptake efficiency more than N uptake efficiency. In confirmation of (H1) we found that a sharp increase of the soil N:P ratio from 4 to 42 g g significantly increased the instantaneous P uptake efficiency (PUptakeE) by five-fold and long-term P uptake efficiency (PUptakeE) by six-fold, while it decreased N uptake efficiency (NUptakeE) and N use efficiency (NUE). In contradiction to (H1), P use efficiency (PUE) did not respond to the simulated extended gradient of soil N:P ratios but remained relatively constant. (H2) was only partially confirmed as soil drought reduced PUptakeE by up to a fourth at high soil N:P ratios but had no significant effect on NUptakeE. As a consequence, increasing summer droughts may decrease the response of PUptakeE to increasing P limitation, which - in the absence of adjustments of the efficiency of P use - can aggravate growth reductions in this eastern Mediterranean tree species under global change.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6459984PMC
http://dx.doi.org/10.3389/fpls.2019.00405DOI Listing

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