ESTIMATE OF ORGANIC-MATTER TURNOVER RATE IN A SAVANNA SOIL BY C-13 NATURAL ABUNDANCE MEASUREMENTS

被引：152
|
作者：
MARTIN, A
MARIOTTI, A
BALESDENT, J
LAVELLE, P
VUATTOUX, R
机构：
[1] UNIV PARIS 06, INRA, BIOGEOCHIM ISOTOP LAB, CNRS, URA 196, F-75252 PARIS 05, FRANCE
[2] INRA, STN SCI SOL, F-78026 VERSAILLES, FRANCE
[3] UNIV ABIDJAN, ECOL TROP LAMTO LAB, NDOUCI, COTE IVOIRE
来源：
SOIL BIOLOGY & BIOCHEMISTRY | 1990年 / 22卷 / 04期
关键词：
D O I：
10.1016/0038-0717(90)90188-6
中图分类号：
S15 [土壤学];
学科分类号：
0903 ; 090301 ;
摘要：
The medium-term dynamics of organic matter in a sandy savanna soil has been investigated at Lamto (Ivory Coast) through changes in the 13C/12C ratio induced by vegetation changes from the C4 to the C3 photosynthetic pathway. After 25 yr of protection from fire, a soil previously covered by C4 grassland vegetation had been progressively colonized by C3 woody plants. Although the total C content did not show significant changes. 52-70% of the original C4 carbon was turned over when vegetation cover was changed. Turnover of coarse organic debris (> 250 μm) was much greater (97%) than the mineralization (50%) of clay-associated fractions (< 20 μm). © 1990.
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页码：517 / 523
页数：7
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