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Laboratory investigation of the effects of straw and simulated root exudates on aggregate -associated carbon
Ma Hongliang 1 * #,Zhu jianguo 2,Xie zubin 2,Gao ren 3
1.School of Geographical Sciences, Fujian Normal University, FuZhou 350007
2.State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China
3. School of Geographical Sciences, Fujian Normal University, Fuzhou 350007, China
*Correspondence author
#Submitted by
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Funding: none
Opened online: 7 November 2012
Accepted by: none
Citation: Ma Hongliang,Zhu jianguo,Xie zubin.Laboratory investigation of the effects of straw and simulated root exudates on aggregate -associated carbon[OL]. [ 7 November 2012] http://en.paper.edu.cn/en_releasepaper/content/4493111
 
 
Although the enhancement in NPP (Net Primary Productivity) and increases in the soil C content by CO2 enrichment also found, little in known about how increased residue inputs to soils affect the storage of the soil organic C (SOC) in agricultural ecosystems and whether the additional root carbon input may affect the formation of soil aggregates and the information regarding their contribution to aggregate dynamics is insufficient. A simulated experiment was conducted to determine the effects of straw (rice and wheat) and root exudates (glucose, phenol, and organic acids) on the both dynamics and carbon content of soil aggregates with respect to the effects of elevated CO2. The results showed that the soil carbon for macro- (>250 μm) and micro-aggregates (250-53 μm) increased by 8.8%-73.1% due to the addition of straw and by 11.2%-111.7% (P<0.05) due to the exudates. Conversely, the soil carbon in the clay and silt-sized particles (<53 μm) was decreased by 12.3%-22.1% (P<0.05) by glucose and decreased even further with the addition of straw, whereas it was increased only by 5.8%-11.8% with phenol and organic acid. Further more, we found that the distribution of aggregates >53 μm was increased by the addition of straw and significantly increased by glucose and organic acid. The carbon concentration was significantly decreased by the addition of straw for the >250 μm and by glucose for >53 μm; conversely, the carbon concentration was increased by phenol and organic acid for both >250 μm and <53 μm. These results could help to explore the effects of elevated CO2 on the dynamics of both soil aggregates and carbon that may occur in a field due to variations in the crop straw and root exudate levels.
Keywords:Elevated CO2; aggregate dynamics; carbon content; glucose; phenol; organic acid
 
 
 

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