Soil organic carbon associated with aggregate-size and density fractions in a Mollisol amended with charred and uncharred maize straw
| Autor: | Si-jia Liu, Cai Hongguang, Ri-yue Liu, Ren Jun, Xin-xin Lin, Jin-jing Zhang, Song Guan |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
0106 biological sciences
Agriculture (General) Bulk soil Plant Science 01 natural sciences Biochemistry S1-972 density fractionation Animal science Food Animals Biochar maize straw Organic matter biochar chemistry.chemical_classification Total organic carbon Ecology Soil organic matter Soil chemistry 04 agricultural and veterinary sciences Soil carbon Straw soil organic carbon chemistry soil aggregates 040103 agronomy & agriculture 0401 agriculture forestry and fisheries Animal Science and Zoology Agronomy and Crop Science 010606 plant biology & botany Food Science |
| Zdroj: | Journal of Integrative Agriculture, Vol 18, Iss 7, Pp 1496-1507 (2019) |
| ISSN: | 2095-3119 |
| Popis: | Straw return has been strongly recommended in China, whereas applying biochar into soil is considered to provide more benefits for agriculture as well as the environment. In this study, a five-year (2011–2015) field experiment was conducted to evaluate the effects of uncharred maize straw amendment (MS) and charred maize straw amendment (charred MS) on organic carbon (C) contents in bulk soil and in various soil aggregate-size and density fractions. Compared to no amendment (CK), the bulk soil organic C content significantly improved by 9.30% for MS and by 23.4% for charred MS. Uncharred and charred maize straw applied annually at a consistent equal-C dosage resulted in 19.7 and 58.2% organic C sequestration efficiency in soil, respectively, after the five years of the field experiment. The percentages of macroaggregates (>0.25 mm) and occluded microaggregates (0.25–0.053 mm) obviously increased by 7.73 and 18.1% for MS and by 10.7 and 19.6% for charred MS, respectively. Moreover, significant incremental increases of 19.4 and 35.0% in macroaggregate-associated organic C occurred in MS and charred MS, respectively. The occluded microaggregates associated organic C significantly increased by 21.7% for MS and 25.1% for charred MS. Mineral-associated organic C ( |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect