Fecha/hora: 07/06/2024 13:29:55

Biblioteca(s): | INIA Treinta y Tres.
Fecha corriente: | 21/02/2014
Fecha de la última actualización: | 28/06/2021
Autoria: | TERRA, J.A.; SHAW, N.J.; REEVES, D.W.; RAPER, R.L.; VAN SANTEN, E.; MASK, P.L.
Afiliación: | JOSÉ ALFREDO TERRA FERNÁNDEZ, INIA (Instituto Nacional de Investigación Agropecuaria), Uruguay.
Título: | Soil Carbon relationships with terrain attributes, electrical conductivity, and a soil survey in a coastal plain landscape.
Año de publicación: | 2004
Fuente/Imprenta: | Soil Science, 2004, V. 169, No. 12, p. 819-831.
DOI: | 10.1097/00010694-200412000-00001
Idioma: | Inglés
Notas: | Article history: Received May 3, 2004 // Accepted Sept. 30, 2004, Publishing Dec. 2004.
Contenido: | Soil organic carbon (SOC) estimation at the landscape level is critical for assessing impacts of management practices on C sequestration and soil quality. We determined relationships between SOC, terrain attributes, field scale soil electrical conductivity (EC), soil texture and soil survey map units in a 9 ha coastal plain field (Aquic and Typic Paleudults) historically managed by conventional means. The site was composite sampled for SOC (0-30 cm) within 18.3 × 8.5-m grids (n = 496), and two data sets were created from the original data. Ordinary kriging, co-kriging, regression kriging and multiple regression were used to develop SOC surfaces that were validated with an independent data set (n = 24) using the mean square error (MSE). The SOC was relatively low (26.13 Mg ha?1) and only moderately variable (CV = 21%), and showed high spatial dependence. Interpolation techniques produced similar SOC maps but the best predictor was ordinary kriging (MSE = 9.11 Mg2 ha?2) while regression was the worst (MSE = 20.65 Mg2 ha?2). Factor analysis indicated that the first three factors explained 57% of field variability; compound topographic index (CTI), slope, EC and soil textural fractions dominated these components. Elevation, slope, CTI, silt content and EC explained up to 50% of the SOC variability (P ? 0.01) suggesting that topography and historical erosion played a significant role in SOC distribution. Field subdivision into soil map units or k-mean clusters similarly decreased SOC variance (about 30%). The study suggests that terrain attributes and EC surveys can be used to differentiate zones of variable SOC content, which may be used as bench marks to evaluate field-level impact of management practices on C sequestration.
Thesagro: | MANEJO DEL SUELO; SUELO.
Categoría del tema: | --
Registro original: | INIA Treinta y Tres (TT)
Ejemplares: | TT - (32966-1) - PXI - AP - DD - PP/Terra/Arb/2004/2 -  - TERRA/04-1 - DIS