Fecha/hora: 09/06/2024 15:05:09

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