<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Sardans, J</style></author><author><style face="normal" font="default" size="100%">Penuelas, J</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Climate and taxonomy underlie different elemental concentrations and stoichiometries of forest species: the optimum ``biogeochemical niche''</style></title><secondary-title><style face="normal" font="default" size="100%">PLANT ECOLOGY</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">Biogeochemical niche</style></keyword><keyword><style  face="normal" font="default" size="100%">C:N</style></keyword><keyword><style  face="normal" font="default" size="100%">Mediterranean</style></keyword><keyword><style  face="normal" font="default" size="100%">N:P</style></keyword><keyword><style  face="normal" font="default" size="100%">Nutrients</style></keyword><keyword><style  face="normal" font="default" size="100%">phosphorus</style></keyword><keyword><style  face="normal" font="default" size="100%">Potassium</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2014</style></year></dates><publisher><style face="normal" font="default" size="100%">SPRINGER</style></publisher><pub-location><style face="normal" font="default" size="100%">VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS</style></pub-location><volume><style face="normal" font="default" size="100%">215</style></volume><pages><style face="normal" font="default" size="100%">441-455</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">We previously hypothesised the existence of a ``biogeochemical niche{''} occupied by each plant species. Different species should have a specific elemental composition, stoichiometry and allocation as a consequence of their particular metabolism, physiology and structure (morphology) linked to their optimal functioning under the environmental (abiotic and biotic) conditions where they have evolved. We tested this hypothesis using data from the Catalan Forestry Inventory that covers different forest groups growing under a large climatic gradient. Mediterranean species that occupy hotter-drier environments have lower leaf N, P and K concentrations than non-Mediterranean forest species. Within a determined climatic biome, different species competing in the same space have different elemental compositions and allocations linked to their taxonomical differences and their phenotypic plasticity. Gymnosperms have a proportionally higher elemental allocation to leaves than to wood, higher C concentrations, and lower N, P and K concentrations mainly in the stem and branches than angiosperms. The differences among species are linked to asymmetrical use of different elements, suggesting that the biogeochemical niche is a final expression and consequence of long-term species adaptation to particular abiotic factors, ecological role (stress tolerant, ruderal, competitor), different soil occupations and use of resources to avoid interspecific competition, and finally of a certain degree of flexibility to adapt to current environmental shifts.</style></abstract></record><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Sardans, Jordi</style></author><author><style face="normal" font="default" size="100%">Rivas-Ubach, Albert</style></author><author><style face="normal" font="default" size="100%">Estiarte, Marc</style></author><author><style face="normal" font="default" size="100%">Ogaya, Romà</style></author><author><style face="normal" font="default" size="100%">Penuelas, Josep</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Field-simulated droughts affect elemental leaf stoichiometry in Mediterranean forests and shrublands</style></title><secondary-title><style face="normal" font="default" size="100%">ACTA OECOLOGICA-INTERNATIONAL JOURNAL OF ECOLOGY</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">climate change</style></keyword><keyword><style  face="normal" font="default" size="100%">Drought</style></keyword><keyword><style  face="normal" font="default" size="100%">Growth rate hypothesis</style></keyword><keyword><style  face="normal" font="default" size="100%">N:P</style></keyword><keyword><style  face="normal" font="default" size="100%">nitrogen</style></keyword><keyword><style  face="normal" font="default" size="100%">Ontogeny</style></keyword><keyword><style  face="normal" font="default" size="100%">phosphorus</style></keyword><keyword><style  face="normal" font="default" size="100%">Potassium</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2013</style></year></dates><publisher><style face="normal" font="default" size="100%">GAUTHIER-VILLARS/EDITIONS ELSEVIER</style></publisher><pub-location><style face="normal" font="default" size="100%">23 RUE LINOIS, 75015 PARIS, FRANCE</style></pub-location><volume><style face="normal" font="default" size="100%">50</style></volume><pages><style face="normal" font="default" size="100%">20-31</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">This study evaluated the change induced by the year season and by experimentally induced drought on foliar element stoichiometry of the predominant woody species (Quercus ilex and Erica multiflora) in two Mediterranean ecosystems, a forest and a shrubland. This study is based in two long-term (11 yr) field experiments that simulated drought throughout the annual cycle. The effects of experimental droughts were significant but weaker than the changes produced by ontogeny and seasonality. Leaf N and P concentrations were higher in spring (the main growing season) in E. multiflora and, in Q. ilex in autumn (a period of additional growth). Leaf N:P ratios were lower in spring. In Q. ilex, the highest leaf K concentrations and leaf K:P ratios, and the lowest leaf C:K and N:K ratios, occurred in summer, the season when water stress was greatest. In E. multiflora, leaf K concentrations and K:P ratios were highest, and leaf C:K and N:K ratios were lowest in the plants from the drought-treated plots. The plant capacity to change K concentrations in response to seasonality and to drought is at least as great as the capacity to change N and P concentrations. The results underscore the importance of K and its stoichiometry relative to C, N and P in dry environments. These results indicate first, that N:P ratio shifts are not uniquely related to growth rate in Mediterranean plants but also to drought, and second, that there is a need to take into account K in ecological stoichiometry studies of terrestrial plants. (C) 2013 Elsevier Masson SAS. All rights reserved.</style></abstract></record><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Suz, Laura M</style></author><author><style face="normal" font="default" size="100%">Martín, María P</style></author><author><style face="normal" font="default" size="100%">Fischer, Christine R</style></author><author><style face="normal" font="default" size="100%">Bonet, José a</style></author><author><style face="normal" font="default" size="100%">Colinas, Carlos</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Can NPK fertilizers enhance seedling growth and mycorrhizal status of Tuber melanosporum-inoculated Quercus ilex seedlings?</style></title><secondary-title><style face="normal" font="default" size="100%">Mycorrhiza</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">Black truffle</style></keyword><keyword><style  face="normal" font="default" size="100%">DNAanalysis</style></keyword><keyword><style  face="normal" font="default" size="100%">ectomycorrhiza</style></keyword><keyword><style  face="normal" font="default" size="100%">morphotyping</style></keyword><keyword><style  face="normal" font="default" size="100%">nitrogen</style></keyword><keyword><style  face="normal" font="default" size="100%">Phosphorous</style></keyword><keyword><style  face="normal" font="default" size="100%">Potassium</style></keyword><keyword><style  face="normal" font="default" size="100%">Truffle orchard</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2010</style></year></dates><volume><style face="normal" font="default" size="100%">20</style></volume><pages><style face="normal" font="default" size="100%">349-360</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">Although successful cultivation of the black truffle (Tuber melanosporum) has inspired the establishment of widespread truffle orchards in agricultural lands throughout the world, there are many unknowns involved in proper management of orchards during the 6-10 years prior to truffle production, and there are conflicting results reported for fertilizer treatments. Here, we systematically evaluate the combined effects of nitrogen, phosphorous, and potassium with different doses of each element, applied to either foliage or roots, on plant growth parameters and the mycorrhizal status of outplanted 3-year-old seedlings in five experimental Quercus ilex-T. melanosporum orchards. Fertilization did not significantly improve seedling aboveground growth, but the plants treated with the fertilizer 12-7-7 applied to the roots (HNr) displayed longer field-developed roots. Only the fertilizer with the highest dose of K (10-6-28) applied to the foliage (HKf) increased the probability of fine root tip colonization by T. melanosporum in field-developed roots. However, the plants treated with the same fertilizer applied to the soil (HKr) presented the highest probability for colonization by other competing mycorrhizal soil fungi. Potassium seems to have an important role in mycorrhizal development in these soils. Apart from T. melanosporum, we found 14 ectomycorrhizal morphotypes, from which seven were identified to species level, three to genus, two to family, and two remained unidentified by their morphological characteristics and DNA analyses.</style></abstract><accession-num><style face="normal" font="default" size="100%">20033737</style></accession-num></record><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Gómez-Aparicio, LORENA</style></author><author><style face="normal" font="default" size="100%">Gómez, Jose M.</style></author><author><style face="normal" font="default" size="100%">Zamora, Regino</style></author><author><style face="normal" font="default" size="100%">Boettinger, Janis L.</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Canopy vs. soil effects of shrubs facilitating tree seedlings in Mediterranean montane ecosystems</style></title><secondary-title><style face="normal" font="default" size="100%">Journal of Vegetation Science</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">Nurse shrub</style></keyword><keyword><style  face="normal" font="default" size="100%">Positive interaction</style></keyword><keyword><style  face="normal" font="default" size="100%">Potassium</style></keyword><keyword><style  face="normal" font="default" size="100%">Removal experiment</style></keyword><keyword><style  face="normal" font="default" size="100%">shade</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2005</style></year><pub-dates><date><style  face="normal" font="default" size="100%">2005///</style></date></pub-dates></dates><urls><web-urls><url><style face="normal" font="default" size="100%">http://dx.doi.org/10.1111/j.1654-1103.2005.tb02355.x</style></url></web-urls></urls><volume><style face="normal" font="default" size="100%">16</style></volume><pages><style face="normal" font="default" size="100%">191 - 198</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">Abstract. Question: Is the facilitative effect of nurse shrubs on early recruitment of trees mediated by a ‘canopy effect’(microclimate amelioration and protection from herbivores), a ‘soil effect’(modification of soil properties), or both? Location: Two successional montane shrublands at the Sierra Nevada Protected Area, SE Spain. Method: Seedlings of Quercus and Pinus species were planted in four experimental treatments: (1) under shrubs; (2) in open interspaces without vegetation; (3) under shrubs where the canopies were removed; (4) in open interspaces but covering seedlings with branches, mimicking a shrub canopy. Results: Both effects benefited seedling performance. However, microclimatic amelioration due to canopy shading had the strongest effect, which was particularly pronounced in the drier site. Below-ground, shrubs did not modify soil physical characteristics, organic matter, total N and P, or water content, but significantly increased available K, which has been shown to improve seedling water-use efficiency under drought conditions. Conclusions: We propose that in Mediterranean montane ecosystems, characterised by a severe summer drought, pioneer shrubs represent a major safe site for tree early recruitment during secondary succession, improving seedling survival during summer by the modification of both the above-and below-ground environment.</style></abstract><issue><style face="normal" font="default" size="100%">2</style></issue><notes><style face="normal" font="default" size="100%">The following values have no corresponding Zotero field:&lt;br/&gt;publisher: Blackwell Publishing Ltd</style></notes></record><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Milla, R</style></author><author><style face="normal" font="default" size="100%">Castro-Diez, P</style></author><author><style face="normal" font="default" size="100%">Maestro-Martínez, M</style></author><author><style face="normal" font="default" size="100%">Montserrat-Martí, G</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Does the Gradualness of Leaf Shedding Govern Nutrient Resorption from Senescing Leaves in Mediterranean Woody Plants?</style></title><secondary-title><style face="normal" font="default" size="100%">Plant and Soil</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">leaf shedding phenology</style></keyword><keyword><style  face="normal" font="default" size="100%">nutrient retranslocation</style></keyword><keyword><style  face="normal" font="default" size="100%">nutrient status</style></keyword><keyword><style  face="normal" font="default" size="100%">Potassium</style></keyword><keyword><style  face="normal" font="default" size="100%">resorption efficiency</style></keyword><keyword><style  face="normal" font="default" size="100%">resorption proficiency</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2005</style></year></dates><volume><style face="normal" font="default" size="100%">278</style></volume><pages><style face="normal" font="default" size="100%">303-313</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">The resorption of nutrients from senescing leaves is a key component of the nutrient conservation strategy of plants. Despite its relevance, the regulation of the eﬃciency of this process is poorly understood. The aim of this work was to test the hypothesis that species that shed leaves gradually along the year are less eﬃcient reabsorbing nutrients from senescing leaves than species that shed leaves in a short period. N-, P-, and Kresorption-eﬃciencies were measured in 11 Mediterranean species and regressed against an index of the gradualness of leaf shedding. Additionally, the bivariate relations among leaf nutrient content before senescence, nutrient content in senesced leaves, pool of nutrients reabsorbed during senescence, and nutrient resorption eﬃciency, were examined. K-resorption-eﬃciency was markedly lower in species with protracted leaf-shedding, in agreement with the initial hypothesis. This pattern was less signiﬁcant for Nand P-resorption-eﬃciencies. When leaf nutrient content before senescence was high, the amount of nutrients reabsorbed and the amount of nutrients in senesced leaves were high. Consequently, nutrient resorption eﬃciency was unaﬀected by the leaf nutrient status before senescence. It is concluded that the leaf shedding pattern per se inﬂuences nutrient resorption in Mediterranean perennials, irrespective of additional environmental controls. Furthermore, it is suggested that plants diﬀering in nutrient status do not exhibit diﬀerent nutrient resorption eﬃciencies because the nutrient content of leaves before senescence aﬀects the components of resorption eﬃciency in countervailing ways.</style></abstract></record><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Milla, R.</style></author><author><style face="normal" font="default" size="100%">Castro-Díez, P.</style></author><author><style face="normal" font="default" size="100%">Maestro-Martínez, M.</style></author><author><style face="normal" font="default" size="100%">Montserrat-Martí, G.</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Does the Gradualness of Leaf Shedding Govern Nutrient Resorption from Senescing Leaves in Mediterranean Woody Plants?</style></title><secondary-title><style face="normal" font="default" size="100%">Plant and Soil</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">leaf shedding phenology</style></keyword><keyword><style  face="normal" font="default" size="100%">nutrient retranslocation</style></keyword><keyword><style  face="normal" font="default" size="100%">nutrient status</style></keyword><keyword><style  face="normal" font="default" size="100%">Potassium</style></keyword><keyword><style  face="normal" font="default" size="100%">resorption efficiency</style></keyword><keyword><style  face="normal" font="default" size="100%">resorption proficiency</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2005</style></year><pub-dates><date><style  face="normal" font="default" size="100%">2005///</style></date></pub-dates></dates><urls><web-urls><url><style face="normal" font="default" size="100%">http://www.springerlink.com/index/10.1007/s11104-005-8770-z</style></url></web-urls></urls><volume><style face="normal" font="default" size="100%">278</style></volume><pages><style face="normal" font="default" size="100%">303 - 313</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">The resorption of nutrients from senescing leaves is a key component of the nutrient conservation strategy of plants. Despite its relevance, the regulation of the eﬃciency of this process is poorly understood. The aim of this work was to test the hypothesis that species that shed leaves gradually along the year are less eﬃcient reabsorbing nutrients from senescing leaves than species that shed leaves in a short period. N-, P-, and Kresorption-eﬃciencies were measured in 11 Mediterranean species and regressed against an index of the gradualness of leaf shedding. Additionally, the bivariate relations among leaf nutrient content before senescence, nutrient content in senesced leaves, pool of nutrients reabsorbed during senescence, and nutrient resorption eﬃciency, were examined. K-resorption-eﬃciency was markedly lower in species with protracted leaf-shedding, in agreement with the initial hypothesis. This pattern was less signiﬁcant for Nand P-resorption-eﬃciencies. When leaf nutrient content before senescence was high, the amount of nutrients reabsorbed and the amount of nutrients in senesced leaves were high. Consequently, nutrient resorption eﬃciency was unaﬀected by the leaf nutrient status before senescence. It is concluded that the leaf shedding pattern per se inﬂuences nutrient resorption in Mediterranean perennials, irrespective of additional environmental controls. Furthermore, it is suggested that plants diﬀering in nutrient status do not exhibit diﬀerent nutrient resorption eﬃciencies because the nutrient content of leaves before senescence aﬀects the components of resorption eﬃciency in countervailing ways.</style></abstract><issue><style face="normal" font="default" size="100%">1-2</style></issue></record></records></xml>