Both crop straws and soil samples

Therefore, the study on the changes in CO2 emissions when the deforestation occurs and the crop straws apply to the previous forest soils will be very important. In fact, straw returning to field is a common management regime for arable cropland, and a number of literatures regarding the crop residue decomposition rates in cropland soils or the effects of crop straw amendment on CO2 emissions from cropland soils have been published (Zhang et al., 2013).