Root-derived respiration and non-structural carbon of rice seedlings |
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| Institution: | 1. Institute of Soil Science and Land Evaluation, University of Hohenheim, Emil-Wolff Strasse 27, D-70599 Stuttgart, Germany;2. Key Laboratory of Ecosystem Network Observation and Modelling, Institute of Geographic Sciences & Natural Resources Research, the Chinese Academy of Sciences, PO Box 9719, Beijing 100101, PR China;3. Department of Agroecosystem Research, University of Bayreuth, D-95440 Bayreuth, Germany;4. Department of Chemical Ecology and Ecosystem Research, Vienna Ecology Centre, University of Vienna, Althanstrasse 14, A-1090, Wien, Austria;1. Departamento de Biología Vegetal y Ecología, Facultad de Biología, Universidad de Sevilla, Apartado 1095, E-41080 Sevilla, Spain;2. Laboratorio de Ecología de Pastizales, Av Angel Gallardo 470, 2° piso Área de Botánica, Buenos Aires, Argentina;3. Department of Plant Ecology, University of Bayreuth, Universitätsstrasse 30, 95440 Bayreuth, Germany;1. School of Metallurgy and Environment, Central South University, Changsha 410083, China;2. College of Bioscience and Biotechnology, Hunan Agricultural University, Changsha 410128, China;3. Crop and Environment Sciences Department, Harper Adams University, Newport, Shropshire, TF10 8NB, United Kingdom;1. College of Life Sciences, Northwest A&F University, 22 Xinong Road, Yangling 712100, Shaanxi, China;2. Biomass Energy Center for Arid and Semi-arid Lands, Northwest A&F University, 22 Xinong Road, Yangling 712100, Shaanxi, China;3. National Engineering Laboratory for Cereal Fermentation Technology, Jiangnan University, 1800 Lihu Avenue, Wuxi 214122, Jiangsu, China;4. College of Environment Science and Engineering, Shaanxi University of Science & Technology, Xi’an 710021, Shaanxi, China;1. Endemic Medicine and Hepatology Department, Faculty of Medicine, Cairo University, Cairo, Egypt;2. National Hepatology and Tropical Medicine Research Institute, Cairo, Egypt;3. Community Medicine, Faculty of Medicine, Ain Shams University, Al Waili, Cairo Governorate, Egypt;4. Endemic Medicine and Hepatology Department, Faculty of Medicine, Beni-Suef University, Beni-Suef, Egypt;5. Pathology Department, Faculty of Medicine, Cairo University, Cairo, Egypt;1. ITMO University, Saint Petersburg, Russian Federation;2. ITMO University, Saint Petersburg, Russian Federation;3. ITMO University, Saint Petersburg, Russian Federation |
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| Abstract: | Various methods have been suggested to separate root and microbial contributions to soil respiration. However, to date there is no ideal approach available to partition below-ground CO2 fluxes in its components although the combination of traditional methods with approaches based on isotopes seems especially promising for the future improvement of estimates. Here we provide evidence for the applicability of a new approach based on the hypothesis that root-derived (rhizomicrobial) respiration, including root respiration and CO2 derived from microbial activity in the immediate vicinity of the root, is proportional to non-structural carbon contents (sugars and organic acids) of plant tissues. We examined relationships between root-derived CO2 and non-structural carbon of rice (Oryza sativa) seedlings using 14C pulse labelling techniques, which partitioned the 14C fixed by photosynthesis into root-derived 14CO2, and 14C in sugars and organic acids of roots and shoots. After the 14C pulse 14C in both sugars and organic acids of plant tissues decreased steeply during the first 12 h, and then decreased at a lower rate during the remaining 60 h. Soil 14CO2 efflux and soil CO2 efflux strongly depended on 14C pools in non-structural carbon of the plant tissues. Based on the linear regression between root-derived respiration and total non-structural carbon (sugars and organic acids) of roots, non-rhizomicrobial respiration (SOM-derived) was estimated to be 0.25 mg C g−1 root d.w. h−1. Assuming the value was constant, root-derived respiration contributed 85–92% to bulk soil respiration. |
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