Contribution of root respiration to soil respiration in a rape (Brassica campestris L.) field in Southwest China

Q. Hao and C. Jiang
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Q. Hao: Key Laboratory of Eco-Environments in Three Gorges Reservoir Region (Ministry of Education), College of Resources and Environment, Southwest University, Chongqing, P.R. China
C. Jiang: Key Laboratory of Eco-Environments in Three Gorges Reservoir Region (Ministry of Education), College of Resources and Environment, Southwest University, Chongqing, P.R. China

Plant, Soil and Environment, 2014, vol. 60, issue 1, 8-14

Abstract: This study aimed to separate the respective contributions of root and microbial respiration to soil respiration in a rape field in Southwest China. The soil respiration was measured with a closed chamber technique and a regression method was used to apportion root and microbial respiration. Microbial and root respiration ranged from 70.67 to 183.77 mg CO2/m2/h and 21.99 to 193.09 mg CO2/m2/h, averaged 127.16 and 116.66 mg CO2/m2/h during the rape growing season, respectively. Root respiration coefficient ranged from 0.41 to 5.39 mg C-CO2/g C/h and was negatively correlated with root/shoot ratio, aboveground and belowground biomass, but positively correlated with root N content. The contribution of root respiration to soil respiration averaged 44.2%, ranging from 14.5% to 62.62%.

Keywords: root respiration coefficient; microbial respiration; root biomass; root N content; root/shoot ratio (search for similar items in EconPapers)
Date: 2014
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Persistent link: https://EconPapers.repec.org/RePEc:caa:jnlpse:v:60:y:2014:i:1:id:425-2013-pse

DOI: 10.17221/425/2013-PSE

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