<?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%">Gratani, L</style></author><author><style face="normal" font="default" size="100%">Crescente, M F</style></author><author><style face="normal" font="default" size="100%">Petruzzi, M</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Relationship between leaf life-span and photosynthetic activity of Quercus ilex in polluted urban areas (Rome).</style></title><secondary-title><style face="normal" font="default" size="100%">Environmental pollution (Barking, Essex : 1987)</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">chlorophyll content</style></keyword><keyword><style  face="normal" font="default" size="100%">leaf life-span</style></keyword><keyword><style  face="normal" font="default" size="100%">leaf thickness</style></keyword><keyword><style  face="normal" font="default" size="100%">Net photosynthesis</style></keyword><keyword><style  face="normal" font="default" size="100%">shoot production</style></keyword><keyword><style  face="normal" font="default" size="100%">traffic level</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2000</style></year></dates><volume><style face="normal" font="default" size="100%">110</style></volume><pages><style face="normal" font="default" size="100%">19-28</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">Anatomical, morphological and physiological leaf traits of Quercus ilex in response to different traffic levels (high traffic level, type A sites; average traffic level, type B sites; control sites, type C sites) were analysed in Rome. Superficial leaf deposits were analysed comparing unwashed and washed leaf samples. Washing lowered Pb 61% in A, 54% in B and 27% in C. Sr, Fe, Cu, Zn and Al showed the same trend as Pb. The higher photosynthetic activity of 1-year-old leaves (Pn=7.0+/-2.9 micromol m(-2 )s(-1), average value) in A sites with respect to B sites (6.7+/-2.4 micromol m(-2 )s(-1)) and C sites (6.7+/-1.8 micromol m(-2 )s(-1)) seems to be related to higher stomatal conductance (g(s)=0.13+/-0.06 mol m(-2 )s(-1)), higher total chlorophyll content (Chl=1.57 mg g(-1)) and higher leaf thickness (L(T)=218.9 microm), particularly palisade parenchyma thickness (109.4 microm). Q. ilex showed, on average, 95% of 1-year-old leaves and rarely 2-year-old leaves in A and B sites; 77% 1-year leaves, 20% previous-year leaves and sporadic 3-year leaves in C sites. The enhanced leaf senescence in A sites is compensated by a stimulated shoot production (18% higher with respect to C sites); 25% increased specific leaf area seems to be compensatory growth occurring in order to increase the size of the assimilatory area. The inverse trend of leaf life-span and Pn seems to be Q. ilex' adaptive strategy in polluted areas.</style></abstract><accession-num><style face="normal" font="default" size="100%">15092853</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%">GLENN, M G</style></author><author><style face="normal" font="default" size="100%">GOMEZBOLEA, A</style></author><author><style face="normal" font="default" size="100%">LOBELLO, R</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">METAL CONTENT AND COMMUNITY STRUCTURE OF CRYPTOGAM BIOINDICATORS IN RELATION TO VEHICULAR TRAFFIC IN MONTSENY-BIOSPHERE-RESERVE (CATALONIA, SPAIN)</style></title><secondary-title><style face="normal" font="default" size="100%">LICHENOLOGIST</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">airborn particles</style></keyword><keyword><style  face="normal" font="default" size="100%">bryophytes</style></keyword><keyword><style  face="normal" font="default" size="100%">corticolous macrolichens</style></keyword><keyword><style  face="normal" font="default" size="100%">metal content</style></keyword><keyword><style  face="normal" font="default" size="100%">Montseny Biosphere Reserve</style></keyword><keyword><style  face="normal" font="default" size="100%">Parmelia</style></keyword><keyword><style  face="normal" font="default" size="100%">Quercus ilex</style></keyword><keyword><style  face="normal" font="default" size="100%">traffic level</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">1995</style></year></dates><publisher><style face="normal" font="default" size="100%">ACADEMIC PRESS (LONDON) LTD</style></publisher><pub-location><style face="normal" font="default" size="100%">24-28 OVAL RD, LONDON, ENGLAND NW1 7DX</style></pub-location><volume><style face="normal" font="default" size="100%">27</style></volume><pages><style face="normal" font="default" size="100%">291-304</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">The health, abundance, metal content and species richness of corticolous macrolichens and bryophytes of Quercus ilex were compared at nine roadside stations in Montseny Biosphere Reserve, 40 km NNE of Barcelona, and at a control site outside the industrial metropolis. Stations were characterized by traffic levels and the correlated parameter airborne particles. Corticolous flora at all stations was dominated by sorediate Parmelia species (P. caperata, P. soredians, P. subrudecta, P. subaurifera, P. sulcata and P. perlata). Damage, mainly due to arthropod feeding and fungal parasites, ranged from 14 to 33% of mean cover per station in the park and was 10% at the control site. Elevated levels of Pb, Zn and Cu were found in large thalli near the roadsides. (C) 1995 The British Lichen Society</style></abstract><notes><style face="normal" font="default" size="100%">APS</style></notes><research-notes><style face="normal" font="default" size="100%">APS</style></research-notes></record></records></xml>