title: Seasonal fluctuations in Vitis vinifera root respiration in the field.
abstract: We studied the seasonal fluctuation of soil respiration (R(S)), and its root-dependent (R(R)) and basal (R(B)) components, in a Vitis vinifera (Chardonnay) vineyard. The R(S) components were estimated through independent field methods (y-intercept and trenching) and modeled on the basis of a Q(10) response to soil temperature, and fine and coarse root respiration coefficients. The effect of assimilate availability on R(R) was assessed through a trunk girdling treatment. The apparent Q(10) for R(R) was twice that of R(B) (3.5 vs 1.6) and increased linearly with increasing vine root biomass. The fastest R(R) of fine roots was during rapid fruit growth and the fastest R(R) of coarse roots was immediately following fruit development. R(S) was estimated at 32.6 kg ha(-1) d(-1) (69% as a result of R(R) ) for the hottest month and at 7.6 kg ha(-1) d(-1) (18% as a result of R(R)) during winter dormancy. Annual R(S) was low compared with other natural and cultivated ecosystems: 5.4 Mg ha(-1) (46% as a result of R(R)). Our estimates of annual vineyard R(S) are the first for any horticultural crop and suggest that the assumption that they are similar to those of annual crops or forest trees might lead to an overestimation.
authors.affiliation: Centro de Estudios de Zonas Áridas, Facultad de Ciencias Agronómicas, Universidad de Chile, Casilla 129, Coquimbo, Chile.|Departamento de Producción Agrícola, Facultad de Ciencias Agronómicas, Universidad de Chile, Casilla 1004, Santiago, Chile.
authors.forename: Nicolás
authors.initials: N
authors.lastname: Franck
authors.affiliation: Centro de Estudios Avanzados en Zonas Áridas, Universidad de La Serena, Av. Raúl Bitrán s/n, PO Box 554, La Serena, Chile.
authors.forename: Joaquín P
authors.initials: JP
authors.lastname: Morales
authors.affiliation: Centro de Estudios de Zonas Áridas, Facultad de Ciencias Agronómicas, Universidad de Chile, Casilla 129, Coquimbo, Chile.
authors.forename: David
authors.initials: D
authors.lastname: Arancibia-Avendaño
authors.affiliation: Centro de Estudios de Zonas Áridas, Facultad de Ciencias Agronómicas, Universidad de Chile, Casilla 129, Coquimbo, Chile.|Departamento de Ingeniería y Suelos, Facultad de Ciencias Agronómicas, Universidad de Chile, Casilla 1004, Santiago, Chile.
authors.forename: Víctor
authors.initials: V
authors.lastname: García de Cortázar
authors.affiliation: Centro de Estudios de Zonas Áridas, Facultad de Ciencias Agronómicas, Universidad de Chile, Casilla 129, Coquimbo, Chile.|Departamento de Ciencias Ambientales y Recursos Naturales Renovables, Facultad de Ciencias Agronómicas, Universidad de Chile, Casilla 1004, Santiago, Chile.
authors.forename: Jorge F
authors.initials: JF
authors.lastname: Perez-Quezada
authors.affiliation: Centro de Estudios Avanzados en Zonas Áridas, Universidad de La Serena, Av. Raúl Bitrán s/n, PO Box 554, La Serena, Chile.
authors.forename: Andrés
authors.initials: A
authors.lastname: Zurita-Silva
authors.affiliation: Centro de Estudios de Zonas Áridas, Facultad de Ciencias Agronómicas, Universidad de Chile, Casilla 129, Coquimbo, Chile.|Departamento de Producción Agrícola, Facultad de Ciencias Agronómicas, Universidad de Chile, Casilla 1004, Santiago, Chile.
authors.forename: Claudio
authors.initials: C
authors.lastname: Pastenes
mesh_terms: D000383:Agriculture; D000388:Air; D018533:Biomass; D019069:Cell Respiration; D002980:Climate; D006813:Humidity; D016014:Linear Models; D008954:Models, Biological; D018517:Plant Roots / Q000378:metabolism*; D012621:Seasons; D012987:Soil; D013696:Temperature; D027843:Vitis / Q000378:metabolism*
chemical_list: D012987:Soil