caa a22 4500 477110118 CHVBK 20180405111606.0 cr unu---uuuuu 170330e19960401xx s 000 0 eng 10.1007/BF00012067 doi (NATIONALLICENCE)springer-10.1007/BF00012067 Estimation of carbon allocation to the roots from soil respiration measurements of oil palm [Elektronische Daten] [E. Lamade, N. Djegui, P. Leterme] CO2 flux from the soil was measured in situ under oil palms in southern Benin. The experimental design took into account the spatial variability of the root density, the organic matter in the soil-palm agrosystem and the effect of factors such as the soil temperature and moisture. Measurements of CO2 release in situ, and a comparison with the results obtained in the laboratory from the same soil free of roots, provided an estimation of the roots contribution to the total CO2 flux. The instantaneous values for total release in situ were between 3.2 and 10.0 μmol CO2 m-2 s-1. For frond pile zones rich in organic matter, and around oil palm trunks, root respiration accounted for 30% of the efflux when the soil was at field capacity and 80% when the soil was dry with a pF close to 4.2. This proportion remained constant in interrow zones at around 75%, irrespective of soil moisture. Subsequently carbon allocation to the roots was determined. Total CO2 release over a year was 57 Mg of CO2 ha-1 yr-1 (around 1610 g of C per m2 per year), and carbon allocation to the roots was approximately 53 Mg of CO2 ha-1 yr-1 of which approximately 13 Mg CO2 ha-1 yr-1 (25%) was devoted to turn-over and 40 Mg CO2 ha-1 yr-1 (75%) to respiration. Kluwer Academic Publishers, 1996 oil palm nationallicence root carbon allocation nationallicence root respiration nationallicence soil respiration nationallicence soil temperature nationallicence soil moisture nationallicence Lamade E. IRAD-CP, B.P. 5035, 34032, Montpellier cedex 1, France aut Djegui N. SRPH, Pobé, B.P.1, Republic of Benin aut Leterme P. INRA Agronomie, B.P.29 5650, Le Rheu, France aut Plant and Soil Kluwer Academic Publishers; http://www.wkap.nl 181/2(1996-04-01), 329-339 0032-079X 181:2<329 1996 181 11104 https://doi.org/10.1007/BF00012067 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF00012067 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Lamade E. IRAD-CP, B.P. 5035, 34032, Montpellier cedex 1, France aut NATIONALLICENCE 700 1- Djegui N. SRPH, Pobé, B.P.1, Republic of Benin aut NATIONALLICENCE 700 1- Leterme P. INRA Agronomie, B.P.29 5650, Le Rheu, France aut NATIONALLICENCE 773 0- Plant and Soil Kluwer Academic Publishers; http://www.wkap.nl 181/2(1996-04-01), 329-339 0032-079X 181:2<329 1996 181 11104 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer