Effect of Freeze/Thawing Frequency and Soil Water Content on Total Organic Carbon and Dissolved Organic Carbon of Burozem

This paper studied the effect of freeze/thawing frequency and water content on organic carbon of burozem by simulating the temperature conditions.Burozem was collected from the China northeast as the experiment soil.The results showed that the effect of freeze/thawing frequency and water content on total organic carbon(TOC)was not significant.The effect of freeze/thawing frequency on dissolved organic carbon(DOC)was significant.The DOC content decreased firstly and then increased with the increasing frequency of freeze/thawing cycles.The freeze/thawing decreased the DOC content within this experiment range.The ratio change of DOC/TOC with the freeze/thawing cycles was same to the DOC.DOC was a good indicator of the quality of soil organic carbon under different freeze/thawing treatments for its stronger sensitivity to the freeze/thawing cycles.