Short-term variation in aggregation and particulate organic matter under crops and pastures

By:

Freibauer, Annette

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Material type: Article

ArticleLanguage: English Description: p. 77-88Subject(s): LOC classification:

S 623 .S977

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In: In: Thomas, Richard J.; Ayarza, Miguel Angel (eds.). Sustainable land management for the oxisols of the Latin American savannas: Dynamics of soil organic matter and indicators of soil qualitySummary: Short-term changes in soil aggregation, total and particulate organic C and N were studied in cropping and pasture systems of the Brazilian savannas, also known as the Cerrados. Furthermore, the concepts of a hierarchical aggregate structure and of the interaction of soil structure with particulate organic matter (POM) available for temperate soils were evaluated and modified for tropical Oxisols. The results showed that Oxisol peds (>2 mm) were sensitive to land use and subject to significant seasonal turnover, indicating a similar behavior as in temperate soils. Three POM fractions were distinguished: (1) free POM situated in the free soil pore space, (2) easily accessible POM, loosely bound in peds and introduced in this study, and (3) occluded POM, which was not studied. Free and easily accessible POMs were important active C pools and increased with human activity. The ratio of free to easily accessible POMs could clearly characterize the different land-use systems.

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Item type	Current library	Collection	Call number	Copy number	Status	Date due	Barcode	Item holds
Books	CIAT Library CIAT Publications	CIAT Publications	S 623 .S977 (Browse shelf(Opens below))		Available
Book Chapters	CIAT Library General Book Collection	General Book Collection	S 623 .S977 (Browse shelf(Opens below))	c.1	Available

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Short-term changes in soil aggregation, total and particulate organic C and N were studied in cropping and pasture systems of the Brazilian savannas, also known as the Cerrados. Furthermore, the concepts of a hierarchical aggregate structure and of the interaction of soil structure with particulate organic matter (POM) available for temperate soils were evaluated and modified for tropical Oxisols. The results showed that Oxisol peds (>2 mm) were sensitive to land use and subject to significant seasonal turnover, indicating a similar behavior as in temperate soils. Three POM fractions were distinguished: (1) free POM situated in the free soil pore space, (2) easily accessible POM, loosely bound in peds and introduced in this study, and (3) occluded POM, which was not studied. Free and easily accessible POMs were important active C pools and increased with human activity. The ratio of free to easily accessible POMs could clearly characterize the different land-use systems.