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Hao, Q.
- Contribution of Root Respiration to Soil Respiration in a Rape (Brassica campestris L.) Field in Southwest China
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Authors
Affiliations
1 Key Laboratory of Eco-Environments in Three Gorges Reservoir Region (Ministry of Education), College of Resources and Environment, Southwest University, Chongqing, CN
1 Key Laboratory of Eco-Environments in Three Gorges Reservoir Region (Ministry of Education), College of Resources and Environment, Southwest University, Chongqing, CN
Source
Plant, Soil and Environment, Vol 60, No 1 (2014), Pagination: 8–14Abstract
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.Full Text
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