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| Effect of film mulching and AM fungi inoculation on maize growth and rhizosphere soil properties with the addition of weathered coal |
| Received:February 04, 2018 |
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| KeyWord:AM fungi;weathered coal;film mulching;soil enzyme;mycorrhizal colonization |
| Author Name | Affiliation | E-mail | | QIU Lang | State Key Laboratory of Coal Resources and Safe Mining, College of Geoscience and Surveying Engineering, China University of Mining Technology(Beijing), Beijing 100083, China | | | BI Yin-li | State Key Laboratory of Coal Resources and Safe Mining, College of Geoscience and Surveying Engineering, China University of Mining Technology(Beijing), Beijing 100083, China | ylbi88@126.com | | ZHANG Yan-xu | State Key Laboratory of Coal Resources and Safe Mining, College of Geoscience and Surveying Engineering, China University of Mining Technology(Beijing), Beijing 100083, China | | | YU Hai-yang | State Key Laboratory of Coal Resources and Safe Mining, College of Geoscience and Surveying Engineering, China University of Mining Technology(Beijing), Beijing 100083, China | |
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| Abstract: |
| Owing to the heavy evaporation in the spring-autumn period and cold climate, coal exploitation in the Eastern Prairie of China disturbs the soil structure, accelerates soil desertification, and lowers soil fertility, thus hindering crop growth in the mined regions. In order to solve the issues of poor soil nutrients, a pot experiment was conducted with two film mulching patterns, i.e., non-film mulching and film mulching; two soil substrate types, i.e., sandy soil and a mixed substrate of sand and weathered coal; and two levels of microbial inoculation, i.e., arbuscular mycorrhizal (AM) fungi inoculation and no inoculation, namely the control (CK). The aim of this study was to evaluate the effects of AM fungi inoculation on plant growth, water use efficiency, and rhizosphere soil properties under water stress conditions using different soil substrate types and film mulching patterns. Results showed that the inoculated, mixed-substrate system improved maize root colonization and soil external hyphal length compared to those of the inoculated, sandy-substrate system utilizing the two film mulching patterns, but not significantly. In addition, soil total glomalin and easily extractable glomalin contents with the mixed substrate were significantly higher by 80.0%~106.5% and 55.0%~73.3% than with the sandy substrate (P<0.05). With the same mulching pattern, both the AM fungi and CK treatments utilizing the mixed substrate significantly improved the soil SOC, TN, and Olsen-P contents compared to those utilizing the sandy soil (P<0.05), but reduced the soil available K content. The combination of film mulching and AM fungi inoculation positively affected plant height and biomass, leaf SPAD value, and water use efficiency with the mixed substrate. Compared to the sandy soil, the inoculated soil invertase activity with non-film mulching and the soil catalase and alkaline phosphatase activities with film mulching of the mixed substrate significantly increased by 46.8%~59.8%, 37.9%~70.0%, and 57.8%~87.5% (P<0.05), respectively. Our results indicate that the combination of film mulching and AM fungi inoculation can improve plant growth, water use efficiency, and soil fertility with the addition of weathered coal. |
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