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Phosphorus Accretion in Old Leaves of a Mediterranean Shrub Growing at a Phosphorus-Rich Site

AuthorsMilla, Rubén; Palacio, Sara ; Maestro Martínez, Melchor ; Montserrat-Martí, Gabriel
KeywordsCalcareous soils
Mediterranean shrubland
Nutrient resorption
Pistacia lentiscus L.
Issue DateFeb-2006
CitationPlant and Soil 280(1-2): 369-372 (2006)
AbstractStudies dealing with changes in the plant internal nutrient cycling in response to natural, long-term P-fertility gradients are scarce. In this short report, we show some evidence on how leaf P dynamics can be drastically altered when plants typical from nutrient-poor sites grow in long-term P-enriched soils. The study was conducted in two natural populations of the Mediterranean evergreen shrub Pistacia lentiscus L.: one in a P-poor site and the other in a P-rich site. Soil texture and N, P, and organic matter contents were measured at each site. Leaf N and P concentrations were also measured in current-year, 1-year-old, and 2-year-old leaves, and in the senesced leaves. In the P-poor site, leaf P and N decreased as the leaves aged. This occurs because of nutrient reabsorption to other plant organs and/or dilution of nutrients by carbon compounds. In contrast, the leaves from the P-rich site acummulated P (but not N) during leaf lifespan. Consequently, P concentration in senesced leaves was very high in the P-rich site. These results show that, in long-lived perennials living in the field, long-term P enrichment can switch the normal process of P resorption during leaf aging to P accretion in the leaf. P accumulation in the leaves, which are periodically shed, might constitute a simple P excretion mechanism for plants typical from P-poor soils.
Description4 páginas, 1 figura, 1 tabla.-- The original publication is available at www.springerlink.com
Publisher version (URL)http://dx.doi.org/10.1007/s11104-005-3529-0
Appears in Collections:(IPE) Artículos
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