Data/hora: 23/06/2024 12:50:07

Biblioteca(s): 	Embrapa Pantanal.	
Data corrente: 	01/10/1997	
Data da última atualização: 	05/04/2017	
Autoria: 	YONKER, C. M.; SCHIMEL, D. S.; PAROUSSIS, E.; HEIL, R. D.	
Título: 	Patterns of organic carbon accumulation in a semiarid shortgrass steppe, Colorado.	
Ano de publicação: 	1988	
Fonte/Imprenta: 	Soil Science Society of America Journal, v.52, n.2, p.478-483, 1988.	
Idioma: 	Inglês	
Conteúdo: 	Organic C accumulation was measured along an 8-km transect at a site in the semiarid shortgrass steppe of northeastern Colorado. Specific objectives of the study were to (i) measure the quantity and distribution of organic C across toposequences, (ii) test the hypothesis that a disproportionate amount of soil organic C residues in the lowlands (as defined herein), and (iii) assess the role of geomorphic history as determinant of compensatory rates of biochemical organic C transformations. Resulkts of the study showed the surface (A) horizon organic C concentration did not vary systematically among slope postiions of a give toposequences. Similarly, the mass of organic C within the surface meter of soil often did not increase with decreasing elevation across a toposequence. Mass of organic C was found to range from 2.5 kg m-3 on terrace escarpments to 10.7 kg m-3 on sandy uplands. The mass of organic C, as calculated to the BCk horizon, was highest in the lowlands. The mass of buried organic C, as calculated uniformly for a 50-cm thickness of material, represents 17% of the total organic C estimate for the site. In spite of buried soils, lowlands did not contain a disproportionate amount of total landscape organic C.	
Palavras-Chave: 	Biogeoquimica; Geomorphic history; Toposequence.	
Thesagro: 	Matéria Orgânica; Solo.	
Thesaurus Nal: 	biogeochemistry; buried soils.	
Categoria do assunto: 	--	
Registro original: 	Embrapa Pantanal (CPAP)	
Exemplares: 	CPAP - (35043-1) - ADD - SP - PP - SP15405 -  - 15405 - DIS