Response of different soil organic matter pools to biochar and organic fertilizers

被引:97
作者
Plaza, Cesar [1 ]
Giannetta, Beatrice [2 ]
Fernandez, Jose M. [1 ]
Lopez-de-Sa, Esther G. [1 ]
Polo, Alfredo [1 ]
Gasco, Gabriel [3 ]
Mendez, Ana [4 ]
Zaccone, Claudio [2 ]
机构
[1] CSIC, Inst Ciencias Agr, Serrano 115 Bis, Madrid 28006, Spain
[2] Univ Foggia, Dept Sci Agr Food & Environm, Via Napoli 25, I-71121 Foggia, Italy
[3] Univ Politecn Madrid, Dept Prod Agr, ETSI Agronomos, Ciudad Univ, E-28040 Madrid, Spain
[4] Univ Politecn Madrid, Dept Ingn Geol & Minera, ETSI Minas & Energia, Rios Rosas 21, Madrid 28003, Spain
关键词
Biochar; Microbial biomass C; Municipal solid waste compost; Physical fractionation; Sewage sludge; Soil respiration; Stable isotopes; STABILIZATION MECHANISMS; CARBON SEQUESTRATION; TERM STABILIZATION; BLACK CARBON; DECOMPOSITION; C-13; AMENDMENTS; COMPOST; SPECTROSCOPY; DELTA-C-13;
D O I
10.1016/j.agee.2016.04.014
中图分类号
S [农业科学];
学科分类号
09 ;
摘要
A full understanding of the agronomic and environmental potential of biochar, and especially its potential as a C sequestration strategy, requires a full comprehension of its effects on native soil organic matter (SOM), as well as of its interactions with other organic amendments co-applied to the soil. In a field experiment, we investigated changes in quantity and quality of SOM pools characterized by different protection mechanisms as affected by 20 t ha(-1) of biochar added alone or combined with two different organic fertilizers (i.e., municipal solid waste compost and sewage sludge) 8 months after application. In particular, free, intra-macroaggregate, intra-microaggregate, and mineral-associated SOM fractions were separated and analyzed for organic C, total N, and stable isotopic ratios; further, diffuse reflectance infrared Fourier transform spectroscopy was used to examine functional group composition. Soil biomass C content, basal respiration, and metabolic quotient were also determined. Biochar and organic fertilizer application increased significantly SOM content. Biochar accumulated mainly in the free SOM pool, not protected by the soil mineral matrix. Especially noteworthy was the significant interaction effect found between the biochar and organic fertilizer factors on mineral-associated organic C content. This suggested a promoting action of biochar on C stabilization in organically-fertilized soils through the formation of organo-mineral complexes. Organically-fertilized soils had higher microbial C than unfertilized soils. Basal respiration and metabolic quotient, however, were not affected by any of the treatments. As a whole, our results support the potential of biochar application as a strategy to sequester C in soils. (C) 2016 Elsevier B.V. All rights reserved.
引用
收藏
页码:150 / 159
页数:10
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