TAILIEUCHUNG - Báo cáo lâm nghiệp:" Comparison of soil water-contents as measured with a neutron probe and time domain reflectometry in a "

Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí lâm nghiệp đề tài:" Comparison of soil water-contents as measured with a neutron probe and time domain reflectometry in a " | Ann. For. Sci. 60 2003 185-193 INRA EDP Sciences 2003 DOI forest 2003011 185 Original article Comparison of soil water-contents as measured with a neutron probe and time domain reflectometry in a Mediterranean forest Sierra de Gata Central Western Spain María Amparo Vicentea Juan Fernando Gallardoa Gerardo Morenob and María Isabel Gonzálezc a Consejo Superior de Investigaciones Cientlficas Aptdo. 257 Salamanca 37071 Spain b Centro Universitario Universidad de Extremadura Plasencia 10600 Cáceres Spain c Área de Edafologla Universidad de Salamanca Salamanca 37080 Spain Received 12 December 2001 accepted 27 November 2002 Abstract - The present work compares the results obtained with two indirect techniques neutron probe and time domain reflectometry TDR for measuring soil water contents 0 at different depths on an experimental plot in the Sierra de Gata Central Western Spain . At the same time the temporal and spatial evolution of 0 was assessed in the zone studied. Measurements were made over three years from September 1996 to August 1999 . The results point to a good correlation r between 0 measured with both techniques although TDR slightly but significantly P underestimated the 0 values but only during the drying periods and with low 0 values. Non-significant differences between both methods were found for the estimation of soil water contents in the whole soil profile. Accordingly both techniques are interchangeable and it is thus possible to avoid the potential risk of radioactivity. Considerable inter-annual variability was observed in the soil water content governed by the annual rainfall distribution. A flowing-off effect was observed followed by a progressive re-wetting of the soil profile from the bottom. Both the temporal and spatial variabilities of soil water content were found to decrease with depth. soil water-content neutron probe TDR oak forests Western Spain Mediterranean climate Résumé - Comparaison des mesures de teneurs en eau .

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