Carbon decomposition of the topsoils and soil fractions under forest and pasture in the western Brazilian Amazon basin, Rondônia

被引：0
|
作者：
L. -S. Koutika
Th. Choné
F. Andreux
C. C. Cerri
机构：
[1] CNRS,
[2] Centre de Pédologie Biologique,undefined
[3] 17 rue N-D des pauvres,undefined
[4] B.P. 5,undefined
[5] F-54501 Vandoeuvre-les-Nancy,undefined
[6] France,undefined
[7] Université de Bourgogne,undefined
[8] Centre des Sciences de la Terre,undefined
[9] 6 Boulevard Gabriel,undefined
[10] F-21000 Dijon,undefined
[11] France,undefined
[12] Universidade de São Paulo,undefined
[13] CENA,undefined
[14] CP 96 13416000 Piracicaba,undefined
[15] SP,undefined
[16] Brazil,undefined
来源：
Biology and Fertility of Soils | 2000年 / 30卷
关键词：
Key words Carbon decomposition; Forest; Pastures; Topsoils; Rondônia;
D O I：
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中图分类号：
学科分类号：
摘要：
 The topsoils of two sites, comprising natural forest and 4- and 20-year-old pastures, respectively, were selected in Rondônia to evaluate the changes of soil organic matter due to pasture establishment. These changes were evaluated by measuring the proportions of the C and N associated with clay and silt fractions, and by the C decomposition (CD) rate of the whole topsoils and their size fractions. The topsoils studied had large proportions of C and N associated with fine fractions, especially with clay fractions. The CD rate of the silt fractions was higher than that of the clay fractions under the two forest topsoils and under the 20-year-old pasture. The CD rate of the silt fractions under forest vegetation at each site was significantly higher than that of the silt fractions under pasture vegetation at the same site. The CD of clay fractions followed the same trend as the silt fractions, showing an improvement in the stability of C associated with clay and silt fractions under pasture vegetation.
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页码：284 / 287
页数：3
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