Soil respiration from fields under three crop rotation treatments and three straw retention treatments.

During the 2011 summer crop growing season ( Fig 4A ), out of the four monitoring missions that were conducted, we found highly significant differences twice in the soil respiration test among the three rotation treatments ( Table 1 ), and only once among the three straw retention treatments.

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When the NS treatment was combined with the WM and WM rotation treatments, the SOC concentration in the topsoil (0–10 cm and 11–40 cm) had a decreasing trend after two years of planting, but when the NS treatment was combined with the WF rotation treatment, the SOC concentration in the topsoil had an increasing trend.

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