Tillage effects on particulate and mineral-associated organic matter in two tropical Brazilian soils

被引：17

作者：

Bayer, C

Mielniczuk, J

Giasson, E

Martin-Neto, L

Pavinato, A

机构：

[1] Univ Fed Rio Grande do Sul, Dept Soil Sci, BR-91540000 Porto Alegre, RS, Brazil

[2] Brazilian Agr Res Corp, Sao Paulo, Brazil

[3] Schneider Logemann Co, Porto Alegre, RS, Brazil

来源：

COMMUNICATIONS IN SOIL SCIENCE AND PLANT ANALYSIS | 2006年 / 37卷 / 3-4期

关键词：

organic matter; particulate fraction; no tillage; tropical soils; Cerrado region;

D O I：

10.1080/00103620500446928

中图分类号：

S3 [农学（农艺学）];

学科分类号：

0901 ;

摘要：

Two Ferralsols (350 and 600 g kg -1 clay) from the Brazilian Cerrado Region were evaluated for long-term effects (5 and 8 years) of no tillage on carbon (C) stocks in particulate (>53 mu m) and mineral-associated ((< 53 mu m) soil organic matter (SOM) fractions. Carbon stocks in particulate SOM increased under no tillage compared with conventional tillage, and the rate was higher in the clayey soil (0.6 2Mg C ha(-1) yr(-1)) than in the sandy clay loam soil (0.31 Mg C ha(-1) yr(-1)). In contrast, the mineral-associated SOM in the top soil layer ( 0 - 20 cm) was not affected by tillage system. Sequestration of atmospheric C in tropical no-tillage soils seems to be due to accumulation of C in labile SOM fractions, with highest rates in clayey soils probably due to physical protection.

引用

页码：389 / 401

页数：13

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