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Carbohydrate dynamics in particle-size fractions of sandy spodosols following forest conversion to maize cropping
Carbohydrate dynamics in particle-size fractions of sandy spodosols following forest conversion to maize cropping
- Source :
- Soil Biology and Biochemistry, Soil Biology and Biochemistry, Elsevier, 2006, pp.2834-2842. ⟨10.1016/j.soilbio.2006.04.039⟩
- Publication Year :
- 2006
- Publisher :
- HAL CCSD, 2006.
-
Abstract
- International audience; In southwest France, much of the forested land on sandy spodosols has been converted to continuous maize cropping in the last few decades. To evaluate the impacts of this change on soil organic matter properties, we compared total organic C and neutral and amino sugars content in whole soil and particle size separates of two forested, and five related sites that had been either clear-cut for 12 and 18 mo, or cultivated to maize for 4-22yr. Soil carbohydrates accounted for 4-7% of the total organic C across all sites. Soil organic C contents of clear-cut and cultivated sites were only 57-79% of the average value measured in forested sites. Accordingly, carbohydrate content of clear-cut and cultivated sites were only 35-66% of the value in forested sites. Ordering the sites in a chronosequence indicated that both total organic C and carbohydrate contents decreased with an increase in time elapsed since clear-cutting and maize cultivation. The only exception was a partial recovery of carbohydrate content in the site that had been under continuous maize for 22 yr. The day+silt fraction (0-50 mu m) was enriched in carbohydrates, mainly of microbial origin, whereas the sand size fractions (50-200 and 200-2000 pm) contained fewer carbohydrates which were mainly of plant origin. Monosaccharide analysis of particle size separates revealed significant differences in carbohydrate composition between sites. Relative to forested sites, the coarse and fine sand fractions in clear-cut and cultivated sites were depleted in carbohydrates and were relatively enriched in plant-derived carbohydrates. Carbohydrate content of the day+silt fraction drastically decreased upon clear-cutting. Amino sugar content was consistently lower in clear-cut and cultivated sites than in forested sites, indicating that microbial populations were negatively affected by clear-cutting and cultivation. The fungal population appeared more sensitive than bacteria to these land-use changes as indicated by a greater decline in glucosamine than in muramic acid contents. (c) 2006 Elsevier Ltd. All rights reserved.
- Subjects :
- 0106 biological sciences
PINE FOREST
Amino sugar
Chronosequence
Soil Science
Muramic acid
Silt
[SDV.SA.SDS]Life Sciences [q-bio]/Agricultural sciences/Soil study
01 natural sciences
Microbiology
PARTICLE SIZE SEPARATE
SUCRES
chemistry.chemical_compound
Poaceae
FRACTIONNEMENT GRANULOMETRIQUE
2. Zero hunger
chemistry.chemical_classification
PODZOSOL
BIOCHIMIE
Soil organic matter
CARBOHYDRATES
PIN MARITIME
04 agricultural and veterinary sciences
15. Life on land
Podzol
chemistry
Agronomy
MAIZE CROPPING
Soil water
040103 agronomy & agriculture
0401 agriculture, forestry, and fisheries
010606 plant biology & botany
Subjects
Details
- Language :
- English
- ISSN :
- 00380717
- Database :
- OpenAIRE
- Journal :
- Soil Biology and Biochemistry, Soil Biology and Biochemistry, Elsevier, 2006, pp.2834-2842. ⟨10.1016/j.soilbio.2006.04.039⟩
- Accession number :
- edsair.doi.dedup.....d826505c05553b1c75fddf1113dfd5f2
- Full Text :
- https://doi.org/10.1016/j.soilbio.2006.04.039⟩