Biomass, chemical composition, and microbial decomposability of rice root and straw produced under co-elevated CO 2 and
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ORIGINAL PAPER
Biomass, chemical composition, and microbial decomposability of rice root and straw produced under co-elevated CO2 and temperature Hyun-Jin Park 1 & Sang-Sun Lim 2 & Jin-Hyeob Kwak 3 & Kwang-Seung Lee 4 & Hye In Yang 1,5 & Han-Yong Kim 6 & Sang-Mo Lee 4 & Woo-Jung Choi 1 Received: 17 February 2020 / Revised: 21 April 2020 / Accepted: 28 April 2020 # Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract Rice residue including root and straw are unique carbon (C) source in paddy soils. However, the potential changes in quantity and chemical composition of rice residue under co-elevated atmospheric CO2 concentration ([CO2]) and air temperature (Tair) and the legacy effect of the changed chemical composition on residue decomposition have not been investigated. This study was conducted to investigate biomass, chemical composition, and decomposability of rice root and straw produced under elevated [CO2] and Tair. Root and straw biomass increased by elevated [CO2] and elevated Tair, respectively, and the greatest biomass was achieved under co-elevated [CO2]-Tair for both root and straw. The concentration of lignin (recalcitrant) decreased while that of nonstructural carbohydrates (less recalcitrant) increased by co-elevated [CO2]-Tair. The ratio of lignin-to-nitrogen (lignin/N) decreased by co-elevated [CO2]-Tair compared to ambient [CO2]-Tair due to increased N and decreased lignin concentrations. Decomposability of root (lignin/N, 36.4) produced under co-elevated [CO2]-Tair was greater than that under ambient co-elevated [CO2]-Tair (lignin/N, 53.7); however, there was no difference in decomposability for straw, which had relatively narrow range of lignin/N (27.3–36.5) regardless of [CO2]-Tair conditions. The results of this study provide a novel insight into the changes in quantity and quality of rice residue under elevated [CO2]-Tair that are necessary to predict changes in paddy soil C sequestration under global warming. Keywords Carbon sequestration . Global warming . Paddy soil . Rice residue . Microbial decomposition . Lignin
Introduction Electronic supplementary material The online version of this article (https://doi.org/10.1007/s00374-020-01471-y) contains supplementary material, which is available to authorized users. * Woo-Jung Choi [email protected] 1
Department of Rural & Biosystems Engineering, Chonnam National University, Gwangju 61186, Republic of Korea
2
Bio R&D Center, CJ Cheiljedang, Suwon, Gyeonggi-do 16495, Republic of Korea
3
Department of Rural Construction Engineering, Jeonbuk National University, Jeonju, Jeollabukdo 57896, Republic of Korea
4
National Instrumentation Center for Environmental Management, Seoul National University, Seoul 08826, Republic of Korea
5
Max Planck Institute for Biogeochemistry, 07745 Jena, Germany
6
Department of Applied Plant Science, Chonnam National University, Gwangju 61186, Republic of Korea
Rice (Oryza sativa L.) is a staple food for more than 2 billion people in Asia (Coats 2003). After rice harvest, it is recommended to
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