a decreasing trendp< 0.05
3.3 Content of 13 C-MBC, 13 C-DOC and the ratio of 13 C-MBC/ 13 C-SOC, 13 C-DOC/ 13 C-SOC The content of soil 13 C-MBC and 13 C-DOC in the soil showed a decreasing trend from day 1 to day 27 after labeling ( p< 0.05).
3.3 Content of 13 C-MBC, 13 C-DOC and the ratio of 13 C-MBC/ 13 C-SOC, 13 C-DOC/ 13 C-SOC The content of soil 13 C-MBC and 13 C-DOC in the soil showed a decreasing trend from day 1 to day 27 after labeling ( p< 0.05).