Four years of free-air CO2 enrichment enhance soil C concentrations in aChinese wheat field
ZHONG Shuang , LIANG Wenju , LOU Yilai , LI Qi , ZHU Jianguo
DOI:
Received October 24, 2008,Revised February 09, 2009, Accepted , Available online
Volume 21,2009,Pages 1221-1224
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Elevated atmospheric CO2 can influence soil C dynamics in agroecosystems. The e ects of free-air CO2 enrichment (FACE) and N
fertilization on soil organic C (Corg), dissolved organic C (DOC), microbial biomass C (Cmic) and soil basal respiration (SBR) were
investigated in a Chinese wheat field after expose to elevated CO2 for four full years. The results indicated that elevated CO2 has
stimulative e ects on soil C concentrations regardless of N fertilization. Following the elevated CO2, the concentrations of Corg and
SBR were increased at wheat jointing stage, and those of DOC and Cmic were enhanced obviously across the wheat jointing stage and
the fallow period after wheat harvest. On the other hand, N fertilization did not significantly a ect the content of soil C. Significant
correlations were found among DOC, Cmic, and SBR in this study.
