Root respiration of barley in a semiarid Mediterranean agroecosystem: field and modelling approaches
Morell Soler, Francisco Joaquín
Whitmore, A. P.
MetadataShow full item record
Aims Root respiration is a major contributor to soil CO2 flux, and its response to management practices needs to be evaluated. The aim was to determine the effect of management practices (tillage systems and nitrogen fertilization levels) on root respiration and to develop a model able to simulate root respiration and its components. Methods The study was carried out during two contrasting growing seasons (2007–2008 and 2008– 2009). Root respiration, including root tissue respiration (Rts) and rhizomicrobial respiration of exudates (Rrz), was estimated as the difference between the soil CO2 flux of cropped and bare soil (the so-called root exclusion technique). Additionally a novel sub-model of Rts, was used to simulate root respiration based on root growth and specific root respiration rates. Results Root respiration was reduced under notillage. The model agreed well with the patterns and the amounts of the observed values of root respiration, although prior calibration was needed. Conclusions Root respiration was reduced by the long-term adoption of no-tillage, but was increased by N fertilizer. The root exclusion technique and the model were useful means to estimate root respiration on cropland under semiarid Mediterranean conditions. Additionally the model successfully separated out the theoretical contributions of Rts and Rrz to root respiration.
Is part ofPlant and Soil, 2012, vol. 351, núm. 1, p. 135-147
European research projects
Showing items related by title, author, creator and subject.
Soil CO2 fluxes following tillage and rainfall events in a semiarid Mediterranean agroecosystem: Effects of tillage systems and nitrogen fertilization Morell Soler, Francisco Joaquín; Álvaro-Fuentes, Jorge; Lampurlanés Castel, Jorge; Cantero-Martínez, Carlos (Elsevier, 2010)The response of soil CO2 flux to tillage operations and rainfall events was studied under semiarid Mediterranean conditions. The study was conducted on a barley monoculture agro-ecosystem during summer/autumn fallow ...
Yield and water use efficiency of barley in a semiarid Mediterranean agroecosystem: long-term effects of tillage and N fertilization Morell Soler, Francisco Joaquín; Lampurlanés Castel, Jorge; Álvaro-Fuentes, Jorge; Cantero-Martínez, Carlos (Elsevier, 2011)Conservation tillage systems (no-tillage, NT; and minimum tillage, MT) are being adopted in rainfed agroecosystems of the Mediterranean basin where water availability is the main limiting factor for crop productivity. ...
Soil biochemical properties in a semiarid Mediterranean agroecosystem as affected by long-term tillage and N fertilization Morell Soler, Francisco Joaquín; Lampurlanés Castel, Jorge; Cantero-Martínez, Carlos; Arrúe, José Luis; Álvaro-Fuentes, Jorge; Madejón, E. (Elsevier, 2013)Tillage and N fertilization practices contribute to the balance between soil C inputs and outputs. Thus, the impacts of both practices and their interactions on soil organic C (SOC) dynamics must be studied. The main ...