Litter Quality of<i>Populus</i>Species as Affected by Free-Air<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mtext>CO</mml:mtext><mml:mtext>2</mml:mtext></mml:msub></mml:math>Enrichment and N-Fertilization
Applied and environmental soil science