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Textural, mineralogical and structur...

Zinn, Yuri Lopes.

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Textural, mineralogical and structural controls on soil organic carbon retention in the Brazilian Cerrados.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Textural, mineralogical and structural controls on soil organic carbon retention in the Brazilian Cerrados./
作者:	Zinn, Yuri Lopes.
面頁冊數:	196 p.
附註:	Source: Dissertation Abstracts International, Volume: 66-11, Section: B, page: 5749.
Contained By:	Dissertation Abstracts International66-11B.
標題:	Biogeochemistry. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3197771
ISBN:	9780542420719

Textural, mineralogical and structural controls on soil organic carbon retention in the Brazilian Cerrados.
Zinn, Yuri Lopes.

Textural, mineralogical and structural controls on soil organic carbon retention in the Brazilian Cerrados. - 196 p.

Source: Dissertation Abstracts International, Volume: 66-11, Section: B, page: 5749.

Thesis (Ph.D.)--The Ohio State University, 2006.

The retention of soil organic carbon (SOC) is commonly considered the result of climate, vegetation, internal drainage and management interactions. However, a sparse but considerable set of evidence in the literature suggests that soil texture, mineralogy and aggregation also affect SOC retention. The objective of this research was to qualitatively and quantitatively assess the controls that these three soil properties exert on SOC levels in the Brazilian Savanna (Cerrado) region, in tropical humid South America. Thus, three soils under similar climate and slope, but of contrasting texture and under native vegetation and Eucalyptus plantation, were sampled in triplicate to 1 m depth, and characterized by physical, chemical, mineralogical, Yoder wet sieving, and microscopic analyses. Total C and N concentration were determined in bulk soils, particle size separates (clay, silt, sand) and water-stable aggregates (WSA). A basic assumption was made that the SOC particle size is inherently associated to its retention mechanism: colloidal and soluble forms are retained by sorption to clays; particulate organic matter (POM, >20 mum) are retained outside (free-POM) or inside aggregates (occluded-POM), and silt-sized SOC has intermediate properties. The rationale is that these mechanisms are necessarily determined by soil texture, mineralogy and structure, which then control SOC retention.

ISBN: 9780542420719Subjects--Topical Terms:

545717
Biogeochemistry.

Textural, mineralogical and structural controls on soil organic carbon retention in the Brazilian Cerrados.
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245 1 0 $a Textural, mineralogical and structural controls on soil organic carbon retention in the Brazilian Cerrados.
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500 $a Source: Dissertation Abstracts International, Volume: 66-11, Section: B, page: 5749.
500 $a Adviser: Rattan Lal.
502 $a Thesis (Ph.D.)--The Ohio State University, 2006.
520 $a The retention of soil organic carbon (SOC) is commonly considered the result of climate, vegetation, internal drainage and management interactions. However, a sparse but considerable set of evidence in the literature suggests that soil texture, mineralogy and aggregation also affect SOC retention. The objective of this research was to qualitatively and quantitatively assess the controls that these three soil properties exert on SOC levels in the Brazilian Savanna (Cerrado) region, in tropical humid South America. Thus, three soils under similar climate and slope, but of contrasting texture and under native vegetation and Eucalyptus plantation, were sampled in triplicate to 1 m depth, and characterized by physical, chemical, mineralogical, Yoder wet sieving, and microscopic analyses. Total C and N concentration were determined in bulk soils, particle size separates (clay, silt, sand) and water-stable aggregates (WSA). A basic assumption was made that the SOC particle size is inherently associated to its retention mechanism: colloidal and soluble forms are retained by sorption to clays; particulate organic matter (POM, >20 mum) are retained outside (free-POM) or inside aggregates (occluded-POM), and silt-sized SOC has intermediate properties. The rationale is that these mechanisms are necessarily determined by soil texture, mineralogy and structure, which then control SOC retention.
520 $a The three soils were highly weathered and composed mostly of quartz and kaolinite, with minor and variable contents of Fe-Al oxides, hydroxyl-interlayered vermiculite and illite. These soils were classified as clayey Haplustox, loamy Haplustox and sandy soils (one Quartzipsamment and two sandy Haplustoxes). In all soils, Eucalyptus plantation increased the C/N ratio and decreased aggregation and aggregate-occluded POM in the top 10 cm layer in relation to native vegetation, but bulk SOC concentrations and stocks were not affected. In the sandy soils only, the relative content of SOC in the sand fraction was enriched, whereas it decreased in the clay fraction.
520 $a Soil texture and depth strongly affected bulk SOC concentrations, which could be credibly estimated as a function of clay+silt contents and depth, by means of a novel mathematical model (using data from samples under the two land uses). (Abstract shortened by UMI.)
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650 4 $a Agriculture, Soil Science. $3 1017824
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710 2 0 $a The Ohio State University. $3 718944
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