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| Effects of ditch-buried straw return on nitrogen distribution and microbial community in the straw-soil interface |
| Received:April 18, 2016 |
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| KeyWord:ditch-buried straw returning;straw layer;nitrogen distribution;soil microorganisms |
| Author Name | Affiliation | E-mail | | XU Ming-min | College of Life Sciences, Nanjing Agricultural University, Nanjing 210095, China | | | FENG Jin-xia | College of Agriculture, Nanjing Agricultural University, Nanjing 210095, China | | | CHEN Wei-ping | College of Agriculture, Nanjing Agricultural University, Nanjing 210095, China | | | YANG Hai-shui | College of Agriculture, Nanjing Agricultural University, Nanjing 210095, China | | | LIU Jian | Institute of Agricultural Science along Yangtze River in Jiangsu, Nantong 226541, China | | | BIAN Xin-min | College of Agriculture, Nanjing Agricultural University, Nanjing 210095, China | bjxlml@163.com | | LU Wei | College of Life Sciences, Nanjing Agricultural University, Nanjing 210095, China | luw@njau.edu.cn |
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| Abstract: |
| Ditch-buried straw return(DB-SR) is a novel soil tillage practice which forms a special "straw layer" structure. In order to elaborate the role of straw layer on soil nitrogen distribution and microbial community, a field experiment was conducted under DB-SR with three burial depths(20 cm:DB-SR-20; 40 cm:DB-SR-40 and CK). NH4+-N, NO3--N, microbial biomass carbon(MBC) and community level physiological profile(CLPP) were determined in the straw layer and its interface soil layers under different treatments. Results showed that the structure of "straw layer" had positive effect on nitrogen retentions. In DB-SR-20, the straw layer increased MBC at the interface of straw layer, but no significant effect was found for the functional diversity. In DB-SR-40, MBC decreased at first and then increased at the interface of rice straw layer, but the pattern was reversed for wheat straw layer. Microbial diversity index(H) increased for rice straw but decreased at first and then increased for wheat straw layer over time. CLPP suggested that the microorganisms of straw layer could utilize various carbon sources, and their metabolic activity was higher than CK. In DB-SR-20 for wheat straws, NH4+-N and NO3--N were significantly related to variation of microbial community in the straw-soil interface, but MBC was correlated to the microbial community in the straw layers. In DB-SR-40, NH4+-N、NO3--N and MBC were significantly correlated to the variation of microbial communities in the straw layers. This study suggested that the "straw layer" could effectively increase soil N retention, and increase the functional diversity of soil microbial community. |
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