+ Site Statistics
+ Search Articles
+ Subscribe to Site Feeds
Most Shared
PDF Full Text
+ PDF Full Text
Request PDF Full Text
+ Follow Us
Follow on Facebook
Follow on Twitter
Follow on LinkedIn

+ Translate
+ Recently Requested

Drought changes phosphorus and potassium accumulation patterns in an evergreen Mediterranean forest

Drought changes phosphorus and potassium accumulation patterns in an evergreen Mediterranean forest

Functional ecology 21(2): 191-201

1. Climate models predict more extreme weather in Mediterranean ecosystems, with more frequent drought periods and torrential rainfall. These expected changes may affect major process in ecosystems such as mineral cycling. However, there is a lack of experimental data regarding the effects of prolonged drought on nutrient cycling and content in Mediterranean ecosystems. 2. A 6-year drought manipulation experiment was conducted in a Quercus ilex Mediterranean forest. The aim was to investigate the effects of drought conditions expected to occur over the coming decades, on the contents and concentrations of phosphorus (P) and potassium (K) in stand biomass, and P and K content and availability in soils. 3. Drought (an average reduction of 15% in soil moisture) increased P leaf concentration by 18.2% and reduced P wood and root concentrations (30.9% and 39.8%, respectively) in the dominant tree species Quercus ilex, suggesting a process of mobilization of P from wood towards leaves. The decrease in P wood concentrations in Quercus ilex, together with a decrease in forest biomass growth, led to an overall decrease (by approximately one-third) of the total P content in above-ground biomass. In control plots, the total P content in the above-ground biomass increased 54 kg ha superscript -1(B from 1999 to 2005, whereas in drought plots there was no increase in P levels in above-ground biomass. Drought had no effects on either K above-ground contents or concentrations. 4. Drought increased total soil soluble P by increasing soil soluble organic P, which is the soil soluble P not directly available to plant capture. Drought reduced the ratio of soil soluble inorganic P : soil soluble organic P by 50% showing a decrease of inorganic P release from P bound to organic matter. Drought increased by 10% the total K content in the soil, but reduced the soil soluble K by 20.4%. 5. Drought led to diminished plant uptake of mineral nutrients and to greater recalcitrance of minerals in soil. This will lead to a reduction in P and K in the ecosystem, due to losses in P and K through leaching and erosion, if the heavy rainfalls predicted by IPCC (Intergovernmental Panel on Climate Change) models occur. As P is currently a limiting factor in many Mediterranean terrestrial ecosystems, and given that P and K are necessary for high water-use efficiency and stomata control, the negative effects of drought on P and K content in the ecosystem may well have additional indirect negative effects on plant fitness.

(PDF emailed within 0-6 h: $19.90)

Accession: 013053099

Download citation: RISBibTeXText

DOI: 10.1111/j.1365-2435.2007.01247.x

Related references

Drought's impact on Ca, Fe, Mg, Mo and S concentration and accumulation patterns in the plants and soil of a Mediterranean evergreen Quercus ilex forest. Biogeochemistry 87(1): 49-69, 2008

Increasing drought decreases phosphorus availability in an evergreen Mediterranean forest. Plant and Soil 267(1/2): 367-377, 2004

Modelling the drought impact on monoterpene fluxes from an evergreen Mediterranean forest canopy. Oecologia 160(2): 213-223, 2009

Seasonal patterns of photosystem 2 photochemical efficiency in evergreen sclerophylls and drought semi-deciduous shrubs under Mediterranean field conditions. Photosynthetica 36(1/2): 41-49, 1999

Drought changes the dynamics of trace element accumulation in a Mediterranean Quercus ilex forest. Environmental Pollution 147(3): 567-583, 2006

Phosphorus status of a soil catena under liberian evergreen rain forest: Results of phosphorus-31 NMR spectroscopy and phosphorus adsorption experiments. Zeitschrift fuer Pflanzenernaehrung und Bodenkunde 156(1): 61-66, 1993

Differential accumulation patterns of phosphorus and potassium by canola cultivars compared to wheat. Journal of Plant Nutrition and Soil Science 170(3): 404-411, 2007

Differential accumulation patterns of phosphorus and potassium by canola cuffivars compared to wheat. Journal of Plant Nutrition and Soil Science 170(3): 404-411, 2007

Dark respiration of related evergreen and deciduous Mediterranean plants during induced drought. Bull. Torrey Bot. Cl, 96: 5, 550-5, 1969

Drought-induced embolism in current-year shoots of two Mediterranean evergreen oaks. Forest Ecology and Management 285(none), 2012

Water-use strategies in two co-occurring Mediterranean evergreen oaks: surviving the summer drought. Tree Physiology 27(6): 793-803, 2007

Patterns of dry matter accumulation, nitrogen, phosphorus, and potassium uptake by maize grown under different N fertilizer practices. Agronomia Tropical Maracay 54(4): 371-389, 2004

Tissue accumulation patterns and concentrations of potassium, phosphorus, and carboxyfluorescein translocated from pine seed to the root. Planta, 2018

Drought controls over conductance and assimilation of a Mediterranean evergreen ecosystem: scaling from leaf to canopy. Global Change Biology 9(12): 1813-1824, 2003

Ecosystem respiration in two Mediterranean evergreen Holm Oak forests: Drought effects and decomposition dynamics. Functional Ecology 16(1): 27-39, February, 2002