Effects of different maize straw-returning modes on the soil respiration in a winter wheat field. Effects of different straw-returning regimes on soil organic carbon and carbon pool management index in Guanzhong Plain, Northwest China Short-term response of farmland carbon emission to straw return, two-year plastic film mulching and intercropping Effects of different tillage methods and straw-returning on soil organic carbon content in a winter wheat field. Decomposition characteristics of returned rapeseed straw in soil and effects on soil fertility Energy flow analysis of straw-return agricultural modes in theCentral Shaanxi Plain Variations of soil fertility level in red soil region under long-term fertilization. Effect of straw-returning on the storage and distribution of different active fractions of soil organic carbon.