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| Effects of straw application and crop planting on soil aggregates and microbial community composition |
| Received:December 26, 2016 |
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| KeyWord:straw application;crop planting;soil aggregates;microbial community composition;soil water |
| Author Name | Affiliation | E-mail | | LI Zeng-qiang | State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China
Institute of Environment and Resource & Soil Fertilizers, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China | | | LI Dan-dan | State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | | | ZHAO Bing-zi | State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | bzhao@issas.ac.cn | | ZHANG Jia-bao | State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China | |
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| Abstract: |
| The effects of straw application, crop planting, and their interactions on the stability of soil aggregates and composition of soil microbial communities were studied in a greenhouse pot experiment. Four treatments were used in this experiment:(1) control(CON),(2) no crop planting in soil with maize(Zea mays L.) straw application(SR),(3) crop planting in soil without straw application(CP),(4) straw application with crop planting(SRCP). Each treatment included 40%(W40) and 80%(W80) field capacity. The results showed that straw application had no significant effects on wheat biomass. In comparison with CON treatment, SR or CP treatment significantly increased the amount of >0.25 mm soil aggregates as well as aggregate mean weight diameter(MWD) and geometric mean diameter(GMD). SR treatment had significantly higher soil polysaccharide content than CON treatment. SRCP treatment further increased the amounts of >2 mm and 1~0.5 mm soil aggregates, aggregate MWD and GMD, and soil polysaccharide content compared with SR and CP treatments. No significant differences in content of phospholipid fatty acids(PLFA) and microbial community composition were observed between CON and SR treatments. The CP treatment had significantly higher arbuscular mycorrhizal fungi content compared with CON treatment. Significantly different microbial community compositions were observed between crop planting(CP and SRCP) and non-planting(CON and SR) treatments. Increased soil water significantly increased wheat biomass, soil aggregate MWD and GMD, and PLFA content. Correlation analysis showed that there were significantly positive correlations between the amount of >0.25 mm soil aggregates, soil aggregate MWD and GMD, and the contents of polysaccharides and arbuscular mycorrhizal fungi. Overall, the results indicated that increases in soil polysaccharides(in SR treatment) and arbuscular mycorrhizal fungi(in CP treatment) may contribute to increases in both the amount of macroaggregates and aggregate stability. |
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