TY  - JOUR
AU  - Roggy, J.C.
AU  - Moiroud, A.
AU  - Lensi, R.
AU  - Domenach, A.M.
PY  - 2004//
TI  - Estimating N transfers between N-2-fixing actinorhizal species and the non-N-2-fixing Prunus avium under partially controlled conditions
T2  - Biol. Fertil. Soils
JO  - Biology and Fertility of Soils
SP  - 312
EP  - 319
VL  - 39
IS  - 5
PB  - SPRINGER-VERLAG
KW  - actinorhizal trees
KW  - mixed culture
KW  - litter
KW  - N transfer by roots
KW  - N-15
N2  - Two methods of N transfer between plants-by litter decomposition and root-to-root exchange-were examined in mixed plantations of N-fixing and non-fixing trees. Nitrogen transfers from decaying litters were measured by placing N-15-labelled litters from four actinorhizal tree species around shoots of containerized Prunus avium. Nitrogen transfers by root-to-root exchanges were measured after foliar NO3-N-15 fertilization of Alnus subcordata and Elaeagnus angustifolia growing in containers in association with P. avium. During the first 2 years of litter decomposition, from 5-20% of the N, depending on the litter identity, was released and taken up by P. avium. N availability in the different litters was strongly correlated with the amount of water-soluble N, which was highest in leaves of E. angustifolia. In the association between fixing and non-fixing plants, 7.5% of the A. subcordata N and 25% of E. angustifolia N was transferred to P. avium by root exchange. These results showed that the magnitude of N transfers by root exchange depended on the associated N-2-fixing species. Among the species investigated, E. angustifolia displayed the highest capacity for exudating N from roots as well as for releasing N from litters. These qualities make this tree a promising species for enhancing wood yields in mixed stands.
SN  - 0178-2762
N1  - ISI:000221197000002
ID  - Roggy_etal2004
ER  -