Effects of different tillage factor and straw factor on soil TOC, EOC, DOC and MBC at 0–7 cm, 7–14 cm and 14–21 cm depth.

Different letters in a line under a specific influence factor denote significant difference at the 5% level. Different capitals in a column at different soil depths and treatments present significant different at the 0.05 level. TOC: total organic carbon; MBC: microbial biomass carbon; DOC: dissolved organic carbon; EOC: easily oxidizable carbon.特定影响因子下的同一行中，不同字母表明在5%显著性水平上存在显著差异。针对不同土壤深度与处理方式的同一列内，不同大写字母表明在0.05显著性水平上存在显著差异。TOC：总有机碳（total organic carbon, TOC）；MBC：微生物生物量碳（microbial biomass carbon, MBC）；DOC：溶解性有机碳（dissolved organic carbon, DOC）；EOC：易氧化有机碳（easily oxidizable carbon, EOC）。