Abstract The effects of straw incorporation on soil characters are well known, however, straw incorporation depth impact on corn straw decomposition rate, microbial biomass carbon (MBC) & microbial biomass nitrogen (MBN), soil carbon (C) and nitrogen (N) concentration during straw decomposition have not been documented. A two-year field experiment was carried out in a wheat-corn cropping system to investigate the effects of straw incorporation depth on decomposition rate of corn straw and soil C and N release. The straw incorporation depths were: topsoil 0–10 cm (TI), medium depth 10–20 cm (MI), and deep depth 20–30 cm (DI). The results showed that corn straw decomposition rate was significantly higher in TI by 24.5 % and 16.5 % than in MI and DI treatments from October 2016 to August 2017. The average contents of MBC and MBN during the decomposition period of straw were higher in TI than in MI and DI treatments (P

中文翻译：

---

玉米秸秆掺入深度对小麦-玉米种植体系中秸秆分解率和C&N释放的影响

摘要 秸秆掺入对土壤性状的影响众所周知，但秸秆掺入深度对玉米秸秆分解率、微生物生物量碳（MBC）和微生物生物量氮（MBN）、土壤碳（C）和氮（N）浓度有影响。在秸秆分解过程中没有记录。在小麦-玉米种植系统中进行了为期两年的田间试验，研究了秸秆掺入深度对玉米秸秆分解速率和土壤碳氮释放的影响。秸秆掺入深度为：表层土 0-10 厘米（TI），中等深度 10-20 厘米（MI），深层 20-30 厘米（DI）。结果表明，2016年10月至2017年8月，玉米秸秆分解率在TI处理中显着高于MI和DI处理24.5%和16.5%。