<?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%">Francaviglia, R</style></author><author><style face="normal" font="default" size="100%">Gataleta, L</style></author><author><style face="normal" font="default" size="100%">Marchionni, M</style></author><author><style face="normal" font="default" size="100%">Trinchera, A</style></author><author><style face="normal" font="default" size="100%">Aromolo, R</style></author><author><style face="normal" font="default" size="100%">Benedetti, A</style></author><author><style face="normal" font="default" size="100%">Nisini, L</style></author><author><style face="normal" font="default" size="100%">Morselli, L</style></author><author><style face="normal" font="default" size="100%">Brusori, B</style></author><author><style face="normal" font="default" size="100%">Olivieri, P</style></author><author><style face="normal" font="default" size="100%">Bernardi, E</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Soil quality and vulnerability in a Mediterranean natural ecosystem of Central Italy.</style></title><secondary-title><style face="normal" font="default" size="100%">Chemosphere</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">Acidification</style></keyword><keyword><style  face="normal" font="default" size="100%">Atmospheric depositions</style></keyword><keyword><style  face="normal" font="default" size="100%">Biological indicators</style></keyword><keyword><style  face="normal" font="default" size="100%">Critical loads</style></keyword><keyword><style  face="normal" font="default" size="100%">Soil microbial biomass</style></keyword><keyword><style  face="normal" font="default" size="100%">Soil organic carbon</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2004</style></year></dates><volume><style face="normal" font="default" size="100%">55</style></volume><pages><style face="normal" font="default" size="100%">455-466</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">Wet and dry atmospheric depositions and soil chemical and microbiological properties were determined in a Mediterranean natural ecosystem of Central Italy near Rome (Castelporziano Estate). The monitoring of depositions permitted us to quantify the exceedances of S and N compounds (expressed as eqH(+)ha(-1)year(-1)) over the critical loads of acidity. Critical loads, i.e. the quantity of a substance which a part of the environment can tolerate without adverse effects occurring, were determined adopting the level 0 methodology following the UN/ECE Convention on Long-range Transboundary Air Pollution. Deposition data were available for the period 1992-1997, and acidity exceedances were referred to the main vegetation types present in the area. Results showed that most part of the Estate has a medium degree of vulnerability to acidification, and the corresponding risk of acidification deriving from the exceedances of atmospheric deposition was rather low. The study of soil chemical and microbiological properties included mainly total soil organic carbon (SOC), microbial biomass-C, biomass-C/SOC, soil respiration, and metabolic quotient (qCO2). Soil organic C metabolism has been discussed on the basis of the results from eight sampling sites.</style></abstract><accession-num><style face="normal" font="default" size="100%">14987944</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%">Francaviglia, R.</style></author><author><style face="normal" font="default" size="100%">Gataleta, L.</style></author><author><style face="normal" font="default" size="100%">Marchionni, M.</style></author><author><style face="normal" font="default" size="100%">Trinchera, A.</style></author><author><style face="normal" font="default" size="100%">Aromolo, R.</style></author><author><style face="normal" font="default" size="100%">Benedetti, A.</style></author><author><style face="normal" font="default" size="100%">Nisini, L.</style></author><author><style face="normal" font="default" size="100%">Morselli, L.</style></author><author><style face="normal" font="default" size="100%">Brusori, B.</style></author><author><style face="normal" font="default" size="100%">Olivieri, P.</style></author><author><style face="normal" font="default" size="100%">Bernardi, E.</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Soil quality and vulnerability in a Mediterranean natural ecosystem of Central Italy.</style></title><secondary-title><style face="normal" font="default" size="100%">Chemosphere</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">Acidification</style></keyword><keyword><style  face="normal" font="default" size="100%">Atmospheric depositions</style></keyword><keyword><style  face="normal" font="default" size="100%">Biological indicators</style></keyword><keyword><style  face="normal" font="default" size="100%">Critical loads</style></keyword><keyword><style  face="normal" font="default" size="100%">Soil microbial biomass</style></keyword><keyword><style  face="normal" font="default" size="100%">Soil organic carbon</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2004</style></year><pub-dates><date><style  face="normal" font="default" size="100%">2004///</style></date></pub-dates></dates><urls><web-urls><url><style face="normal" font="default" size="100%">http://www.ncbi.nlm.nih.gov/pubmed/14987944</style></url></web-urls></urls><volume><style face="normal" font="default" size="100%">55</style></volume><pages><style face="normal" font="default" size="100%">455 - 466</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">Wet and dry atmospheric depositions and soil chemical and microbiological properties were determined in a Mediterranean natural ecosystem of Central Italy near Rome (Castelporziano Estate). The monitoring of depositions permitted us to quantify the exceedances of S and N compounds (expressed as eqH(+)ha(-1)year(-1)) over the critical loads of acidity. Critical loads, i.e. the quantity of a substance which a part of the environment can tolerate without adverse effects occurring, were determined adopting the level 0 methodology following the UN/ECE Convention on Long-range Transboundary Air Pollution. Deposition data were available for the period 1992-1997, and acidity exceedances were referred to the main vegetation types present in the area. Results showed that most part of the Estate has a medium degree of vulnerability to acidification, and the corresponding risk of acidification deriving from the exceedances of atmospheric deposition was rather low. The study of soil chemical and microbiological properties included mainly total soil organic carbon (SOC), microbial biomass-C, biomass-C/SOC, soil respiration, and metabolic quotient (qCO2). Soil organic C metabolism has been discussed on the basis of the results from eight sampling sites.</style></abstract><issue><style face="normal" font="default" size="100%">3</style></issue><notes><style face="normal" font="default" size="100%">The following values have no corresponding Zotero field:&lt;br/&gt;accession-num: 14987944</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%">Noble, A D</style></author><author><style face="normal" font="default" size="100%">Little, I P</style></author><author><style face="normal" font="default" size="100%">Randall, P J</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">The influence of Pinus radiata, Quercus suber, and improved pasture on soil chemical properties</style></title><secondary-title><style face="normal" font="default" size="100%">AUSTRALIAN JOURNAL OF SOIL RESEARCH</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">Acidification</style></keyword><keyword><style  face="normal" font="default" size="100%">clay cont</style></keyword><keyword><style  face="normal" font="default" size="100%">exchangeable cations</style></keyword><keyword><style  face="normal" font="default" size="100%">pH</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">1999</style></year></dates><publisher><style face="normal" font="default" size="100%">CSIRO PUBLISHING</style></publisher><pub-location><style face="normal" font="default" size="100%">150 OXFORD ST, PO BOX 1139, COLLINGWOOD, VICTORIA 3066, AUSTRALIA</style></pub-location><volume><style face="normal" font="default" size="100%">37</style></volume><pages><style face="normal" font="default" size="100%">509-526</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">Soil acidification and related land degradation issues are assuming&lt;br/&gt;increasing importance in Australia and challenging the concept of&lt;br/&gt;sustainability of current land management systems. In this study, the&lt;br/&gt;impacts of tree plantations of 2 species and permanent pasture on soil&lt;br/&gt;chemical properties are compared. Soil samples were collected from the&lt;br/&gt;top 50 cm (0-5, 5-10, 10-15, 15-20, 20-30, and 30-50 cm depths) from 3&lt;br/&gt;adjacent sites carrying pasture and monocultures of Pinus radiata&lt;br/&gt;(radiata pine) and Quercus suber (cork oak) on a deep-surfaced yellow&lt;br/&gt;podzolic soil, and differences in soil pH and other soil chemical&lt;br/&gt;properties were examined. In the surface 0-5 cm, pH was similar at all 3&lt;br/&gt;sites. Below that depth, soil pH was significantly lower and&lt;br/&gt;exchangeable Al greater under the cork oak stand than at the other 2&lt;br/&gt;sites. Consistent with a decrease in soil pH there was significantly&lt;br/&gt;less exchangeable Ca under cork oak. Also, less clay was observed under&lt;br/&gt;the cork oak stand and this is taken as evidence of the degradational&lt;br/&gt;impact of soil acidification.&lt;br/&gt;An estimate of Ca in the top 50 cm of the soil implies considerable loss&lt;br/&gt;of Ca under oak, probably by leaching and loss of litter down the slope.&lt;br/&gt;Evidence is presented to show that there has been more Fe and Al&lt;br/&gt;movement under oak than under pasture and pine, this being ascribed in&lt;br/&gt;part to the greater Al and Fe mobilising capacity of the water-soluble&lt;br/&gt;component extracted from freshly fallen leaf litter of oak. The Fe and&lt;br/&gt;Al composition of the oxalate extract from concretionary material at&lt;br/&gt;10-30 cm under oak is consistent with a process similar to&lt;br/&gt;podzolisation. Pseudogleying of Fe and Al may have accompanied the&lt;br/&gt;leaching of bases from the system and a reduction of pH.</style></abstract></record></records></xml>