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| Effect on the quality of sandy fluvo-aquic soil by application of non-hazardous sewage sludge with molybdenum tailings |
| Received:May 24, 2016 |
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| KeyWord:sandy fluvo-aquic soil;non-hazardous sewage sludge;molybdenum tailings;organic matter;soil water-stable aggregates;soil microbial biomass carbon and nitrogen |
| Author Name | Affiliation | E-mail | | LIU Xiao | Institute of Agricultural Resources and Regional Planning, CAAS, National Engineering Laboratory for Improving Quality of Arable Land, Beijing 100081, China | | | HUANG Lin | Sewage Purification Co., Ltd. of Zhengzhou City, Zhengzhou 450000, China | | | GUO Kang-li | Institute of Agricultural Resources and Regional Planning, CAAS, National Engineering Laboratory for Improving Quality of Arable Land, Beijing 100081, China | | | ZHANG Xue-ling | College of Environment, Sichuan Agricultural University, Chengdu 611130, China | | | YANG Jun-cheng | Institute of Agricultural Resources and Regional Planning, CAAS, National Engineering Laboratory for Improving Quality of Arable Land, Beijing 100081, China | | | JIANG Hui-min | Institute of Agricultural Resources and Regional Planning, CAAS, National Engineering Laboratory for Improving Quality of Arable Land, Beijing 100081, China | jianghuimin@caas.cn | | ZHANG Jian-feng | Institute of Agricultural Resources and Regional Planning, CAAS, National Engineering Laboratory for Improving Quality of Arable Land, Beijing 100081, China | zhangjianfeng@caas.cn |
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| Abstract: |
| The products of non-hazardous commercial sewage sludge and molybdenum tailings were used in the accordance of the national standard in the experiment using sandy fluvo-aquic soil under wheat-maize rotation system during 2013 to 2015. The 5-season of 3-year experiment focused on the effects of soil quality variations of the sandy fluvo-aquic soil by the use of non-hazardous sewage sludge and molybdenum tailings for providing theoretical and technical basis for the resource utilization of non-hazardous sewage sludge and molybdenum tailings. Results showed that the combined application of 45 t·hm-2 sewage sludge(W3) with molybdenum tailings had the most significant impact on soil organic matter(SOM), which improved significantly by 165.10% for W3+M1 treatment in maize season and 106.1% for W3+M2 in wheat season respectively. In wheat season, compared with that of the single application of the same level of the sewage sludge, >0.25 mm soil water-stable aggregates(WR0.25), mean weight diameter(MWD), and geometry weight diameter(GWD) enhanced significantly by 38.04%~60.24%, 28.45%~45.27%, and 41.34%~67.77% respectively, in the combined application of sewage sludge with 75 t·hm-2 molybdenum tailings(M1)(P<0.05). It showed that the combined application of sewage sludge with 75 t·hm-2 molybdenum tailings were more prominent in improving the formation of soil water-stable aggregates and soil water-stable aggregates formed under the combined application of sewage sludge with 75 t·hm-2 molybdenum tailings were more stable. The combined application of 45 t·hm-2 sewage sludge with 75 t·hm-2 molybdenum tailings had the most significant impact on SMBC and SMBN, which raised significantly by 235.52% and 156.79% in maize season(P<0.05) and significantly improved by 249.24% and 128.32% in wheat season(P<0.05). Microbial biomass entropy(qMB) increased significantly in the single application of sewage sludge and combined application of sewage sludge with 75 t·hm-2 molybdenum tailings(P<0.05) and in maize and wheat season, respectively improved by 21.95%~46.25% and 36.38%~71.17%. While the combined application of sewage sludge with 150 t·hm-2 molybdenum tailings, SMBC, SMBN and qMB compared with the single application of the same level sewage sludge and the combined application with 75 t·hm-2 molybdenum tailings in maize season respectively decreased by 3.89%~19.85%, 4.31%~17.86% and 6.95%~33.47%; in wheat season reduced by 5.34%~23.24%, 4.33%~28.08% and 3.09%~32.33% respectively. It indicated that the higher application of molybdenum tailings inhibited the soil microbial activity. The combined application of 45 t·hm-2 non-hazardous sewage sludge with 75 t·hm-2 molybdenum tailings significantly ameliorated SOM, WR0.25, MWD, GMD, SMBC, SMBN, and qMB, and improved the quality of sandy fluvo-aquic soil effectively by the mean of grey correlation analysis method, and which did not cause the heavy metals pollution to the soil and grain during the experiment. Furthermore, W3+M1 significantly met to first grade of the soil fertilizer and on this basis, it was recommended that the sewage sludge and molybdenum tailings were no more applied. |
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