| Cite this article: | 袁晶晶,齐学斌,赵京,等.生物炭配施沼液对土壤团聚体及其有机碳分布的影响[J].灌溉排水学报,0,():-. |
| YUAN Jingjing,QI Xuebin,ZHAO Jing,et al.生物炭配施沼液对土壤团聚体及其有机碳分布的影响[J].灌溉排水学报,0,():-. |
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| Effects of biochar and biogas slurry on stability and organic carbon distribution of soil aggregates |
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YUAN Jingjing1, QI Xuebin2, ZHAO Jing3, LI Ping2, DU Zhenjie2, LI Kaiyang2, WANG Panfeng1
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1.Henan Institute of Metrology;2.Farmland Irrigation Research Institute,Chinese Academy of Agricultural Science;3.Laboratory of Organic Solid Waste Treatment and Resource Utilization,Henan Institute of Technology
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| Abstract: |
| 【Background】Biogas slurry (BS) as an environment friendly amendment, which contains easily-available nutrients, e.g., considerable amounts of both macro (N, P, K) and micronutrients (Ca, Mg) that is generated via the anaerobic fermentation of various biomass wastes, has received increasing attention due to its potential in waste reuse. As secondary biomass, are often used to be more suitable than chemical fertilizer toward maintaining the sustainability of agricultural soils, but its production exceeds the acceptable capacity of local farmland in some agricultural regions. Therefore, it is necessary to explore new technologies for safe, ecofriendly and resourceful utilization of this biomass. Biochar is a stable carbon-rich material, which also serving as renewable energy resources to counteract environmental issues, however, the impacts of two representative organic soil amendments on agricultural soils remain ambiguous, specifically in soil aggregate stability. 【Objective】The objective of this study was to evaluate the effects of combined application of biochar and pig manure biogas slurry on the distribution and stability of soil water-stable aggregates and organic carbon base on a three years’ consecutive field experiment in the North China Plain.【Method】This fertilization involved 8 treatments: CK (no fertilizer); biochar (B); 3 level of pig manure biogas slurry ratios (1:6, 1:4 and 1:2 of biogas slurry: water, volume ratio, respectively, namely BS1-BS3:); B+BS1; B+BS2 and B+BS3. All samples were separated into 5 aggregate-size classes (>5 mm, 2～5 mm, 1～2 mm, 0.25～1 mm and >0.25 mm) by wet sieving. 【Result】The results showed that compared with the control, biochar, combined application of biochar and biogas slurry (BS) significantly improved the proportions of >0.25 mm water-stable macro-aggregates, all fertilizations were increased by 13.0%～36.3%. The values of mean weight diameter (MWD) and geometric mean diameter (GMD) under wet sieving in all fertilizations were higher than that in the control, with increase of 11.2%～38.7% in MWD and 11.2%～38.7% in GMD, respectively. When biogas slurry ratio was at 1:4, biochar combined with biogas slurry had the highest value of MWD and GMD. Meanwhile, biochar and biogas slurry amendments significantly increased soil organic carbon content in different size aggregates, which is beneficial to enrich the soil quality prior to other fertilizations in this experiment. Significant positive correlations were observed among the content of organic carbon in different size aggregates, macro-aggregates (>0.25 mm), MWD and GMD according to the correlation analysis (P<0.01). In addition, statistically significant decreases in soil bulk density, with the highest decrease of 6.7% in B+BS3 treatment. 【Conclusion】The optimum application rates were 12 t/hm2 for biochar, and 1:4 of biogas slurry based on the potential economic and environmental values. Taking into account the above-mentioned findings, we can draw the conclusion that the application of biochar and pig manure biogas slurry has significantly positive effects on soil aggregates stability, which generally augments soil structure and reduce disposal costs, providing a low-cost and high value-added method for soil remediation and recycling liquid wastes. |
| Key words: biochar; pig manure biogas slurry; soil water-stable aggregate; soil organic carbon; resource utilization |
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