Sie können Bookmarks mittels Listen verwalten, loggen Sie sich dafür bitte in Ihr SLUB Benutzerkonto ein.
Medientyp:
E-Artikel
Titel:
Changes in Organic Matter Pools and Increases in Carbon Sequestration in Response to Surface Liming in an Oxisol under Long‐Term No‐Till
Beteiligte:
Briedis, Clever;
de Moraes Sá, João Carlos;
Caires, Eduardo Fávero;
de Fátima Navarro, Jaqueline;
Inagaki, Thiago Massao;
Boer, Adriane;
de Oliveira Ferreira, Ademir;
Neto, Caio Quadros;
Canalli, Lutécia Beatriz;
dos Santos, Josiane Bürkner
Erschienen:
Wiley, 2012
Erschienen in:Soil Science Society of America Journal
Sprache:
Englisch
DOI:
10.2136/sssaj2011.0128
ISSN:
1435-0661;
0361-5995
Entstehung:
Anmerkungen:
Beschreibung:
<jats:p>In a no‐till system (NTS) on naturally acidic soils, surface liming is essential to neutralize soil acidity and increases crop productivity. As a result, the soil organic matter (SOM) pools of the soil surface layers may change, reflecting increased C inputs by crop residues. The objective of this study was to quantify changes in SOM pools and the rate of C sequestration that occur in response to surface liming in a long‐term NTS experiment. The experiment was conducted in an Oxisol in southern Brazil. The treatments consisted of the application of 0 or 6 Mg ha<jats:sup>−1</jats:sup> of dolomitic lime on the soil surface in 1993 and a reapplication of 0 or 3 Mg ha<jats:sup>−1</jats:sup> of dolomitic lime in 2000 to plots with or without the previous lime application. Liming caused total organic C (TOC) accumulation, especially in the 0‐ to 2.5‐cm layer. The amount of TOC stored in the 20‐cm layer was 49.9, 52.9, 52.7, and 57.5 Mg ha<jats:sup>−1</jats:sup> in the control, 6 + 0, 0 + 3, and 6 + 3 Mg ha<jats:sup>−1</jats:sup> treatments, respectively. The levels of particulate organic C (POC) and mineral‐associated organic C (MAOC) in the SOM were also enhanced by liming. The increase in POC was directly related (<jats:italic>R<jats:sup>2</jats:sup></jats:italic> = 0.99, <jats:italic>P</jats:italic> = 0.002) to the accumulation of C from crop residues, which was greater in the plots receiving lime treatment. There were positive correlations between TOC and C extractable with hot water, total polysaccharides, and labile polysaccharides. The correlation analysis also demonstrated that TOC was more tightly correlated with POC than with MAOC, indicating a greater influence of the labile fraction on the increase in TOC with surface liming.</jats:p>