Evaluating the short-term effects of rice-maize crop rotation on soil organic carbon changes
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Author list: Ponphang-Nga P., Chidthaisong A.
Publication year: 2017
Journal: RESEARCH JOURNAL OF CHEMISTRY AND ENVIRONMENT (0972-0626)
Volume number: 21
Issue number: 6
Start page: 8
End page: 15
Number of pages: 8
ISSN: 0972-0626
Languages: English-Great Britain (EN-GB)
Abstract
This study aimed to improve our understanding of soil carbon (C) change when cropping changed from maize to lowland or upland rice under field experiments. Measurements of stable carbon isotope of soil organic carbon (SOC) also investigate the incorporation of carbon derived from C4 plants (maize) or C3 plants (rice) into SOC. The amounts of biomass incorporation were significantly affected to SOC. Changing from maize to continue upland rice resulted in SOC loss of about 5% after the three crop cycles. In this study, after the second crops and when the cultivation system was changed from maize to lowland rice, the δ13C value of soil carbon was shifted from -18.77 ‰ to -20.73‰. This represented the rapid incorporation of rice-derived carbon into SOC. Conversion of continuous maize to continuous upland and lowland rice resulted in a decrease in C concentrations in light fractions, especially in lowland rice rotation with maize. Since majority of SOC was in the heavy fraction (>80%), it might play the important role in storing carbon. Consequently, this study demonstrated that crop rotation could significantly affect soil carbon sequestration potential and such effects could be detected as early as when the first land conversion occurred. © 2017, International Congress of Chemistry and Environment. All rights reserved.
Keywords
Lowland rice, Maize-rice rotation, Soil organic carbon, Upland rice
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