<?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%">Zak, D.R.</style></author><author><style face="normal" font="default" size="100%">Grigal, D. F.</style></author><author><style face="normal" font="default" size="100%">Gleeson, S.</style></author><author><style face="normal" font="default" size="100%">Tilman, D.</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Carbon and nitrogen cycling during old-field succession: constraints on plant and microbial biomass. Biogeochemistry 11:111-129.</style></title></titles><keywords><keyword><style  face="normal" font="default" size="100%">CDR</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">1990</style></year></dates><language><style face="normal" font="default" size="100%">eng</style></language><accession-num><style face="normal" font="default" size="100%">LTER.1990-7113</style></accession-num></record></records></xml>