4.6 Article

Effects of Biochar on Soil Aggregation and Distribution of Organic Carbon Fractions in Aggregates

期刊

PROCESSES
卷 9, 期 8, 页码 -

出版社

MDPI
DOI: 10.3390/pr9081431

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biochar; compost; aggregate stability; carbon sequestration; soil microbe activity

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  1. Ministry of Science and Technology of the R.O.C. [MOST 109-2313-B-020-006-]

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The study on the effects of rice husk biochar and cattle manure compost on a sandy loam rural soil in southern Taiwan showed that both amendments promoted soil aggregation and enriched soil organic carbon. The addition of compost further enhanced organic carbon enrichment in microaggregates and mesoaggregates, suggesting their potential role in enhancing carbon sequestration.
Soil aggregates are among crucial factors for determining both the quality and erosion resistance of soils. Biochar is a soil amendment that has seen increasing use to improve specific soil properties, mainly the physical structure and the preserving capacity of water and nutrients, as well as sequestration of soil organic carbon. In this study, we applied the rice husk biochar (RHB) and cattle manure compost (COM) in a sandy loam rural soil, which is widely distributed in southern Taiwan, to investigate the combined effects of the biochar and compost on soil aggregation and dynamic change of organic carbon fractions. Through our incubation experiment, both biochar and compost could promote the soil aggregation after eight weeks incubation. The total amounts of macroaggregates (MaAs, >2.0 mm) and mesoaggregates (MeAs, 0.25-2.0 mm) increased by 1.3-9%. During aggregation processes, a considerably greater amount of the soil organic carbon was found to enrich mainly in MaAs and MeAs in all treatments. The COM addition in the soil further promotes organic carbon enrichment in microaggregates (MiAs, <0.25 mm) + fine particles and MeAs after incubation. Increasing labile organic C (LOC) fractions were significantly found in MaAs and MeAs during aggregation processes, whereas decreasing LOC fractions were found in MiAs. The input of fresh organic matter (RHB and COM) initial acts as binding agents in MiAs, and then further enhances the formation of MeAs and MaAs gradually. In conclusion, RHB promotes the physical protection of organic C by increasing soil aggregation and is hence a management option to enhance the C sequestration potential.

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