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| Effects of straw retention with mixing maize straw by alfalfa straw or N fertilizer on carbon and nitrogen mineralization and microbial functional diversity |
| Received:April 19, 2016 |
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| KeyWord:legume straw;maize straw;C/N ratio;C and N mineralization;soil microorganism |
| Author Name | Affiliation | E-mail | | LI Tao | Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China
University of Chinese Academy of Sciences, Beijing 100049, China | | | GE Xiao-ying | Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China | | | HE Chun-e | Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China | | | OUYANG Zhu | Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China | ouyz@igsnrr.ac.cn |
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| Abstract: |
| Based on C/N ratio, an indoor-incubation experiment was used to study the effect of applying maize straw with high quality alfalfa straw or N fertilizer on C and N mineralization and microbial functional diversity under the same C/N ratio(25:1). Four incubation experiments were:soil with no addition(CK); soil amended with maize straw(M); soil amended with alfalfa straw and maize straw with an adjusted C/N ratio of 25:1(MM); soil amended with inorganic nitrogen fertilizer and maize straw with an adjusted C/N ratio of 25:1(MF). The incubation was conducted at 25℃ in the whole experiment duration. The results showed that:compared to treatments of M and MF, MM treatment improved cumulative CO2 emissions, but leaded to a lowest C mineralization rate. MM treatment had the highest of SOC content among the three treatments. Maize straw leaded to a N immobilization during the 270 d of incubation. Combined application of alfalfa and maize straw and combined application mineral N fertilizer alleviate the N immobilization and increase soil mineral N content. Compared to MF treatment, MM treatment prolonged N availability during the incubation. Straw retention improved the community-level metabolic activity, but straw retention had little impact on soil microbial functional diversity. The content of added N and soil mineral N content significantly affected the community-level physiological profile. |
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