Characterization of dissolved organic carbon in cleared forest soils converted to maize cultivation

Delprat, L.; Chassin, P.; Linères, Monique; Jambert, Corinne

doi:10.1016/s1161-0301(97)00046-4

Cited by 51 publications

(36 citation statements)

References 19 publications

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“…Consequently, SOM decomposition leads to an enrichment in microbial compounds in residual SOM at the expense of plant-derived compounds (Hobara et al 2014;Kaiser and Kalbitz 2012;Malik and Gleixner 2013). In line with this assumption is the observation that DOM in pore-water of agricultural soils can have lower molecular weights and lower aromaticity compared to soils under native vegetation (Accoe et al 2002;Chantigny 2003;Delprat et al 1997;Kalbitz et al 2003). Therefore, one can hypothesize that greater SOM degradation in humandisturbed catchments results in a stronger microbial fingerprint in soil OM that, once exported into the fluvial network, contributes to the above mentioned shift in stream OM composition observed between disturbed and pristine catchments.…”

Section: Introductionmentioning

confidence: 88%

Effects of human land use on the terrestrial and aquatic sources of fluvial organic matter in a temperate river basin (The Meuse River, Belgium)

et al. 2017

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The impact of human activities on the concentrations and composition of dissolved organic matter (DOM) and particulate organic matter (POM) was investigated in the Walloon Region of the Meuse River basin (Belgium). Water samples were collected at different hydrological periods along a gradient of human disturbance (50 sampling sites ranging from 8.0 to 20,407 km 2 ) and during a 1.5 year monitoring of the Meuse River at the city of Liège. This dataset was completed by the characterization of the DOM pool in groundwaters. The composition of DOM and POM was investigated through elemental (C:N ratios), isotopic (d 13 C) and optical measurements including excitation emission matrix fluorescence with parallel factor analysis (EEM-PARAFAC). Land use was a major driver on fluvial OM composition at the regional scale of the Meuse Basin, the composition of both fluvial DOM and POM pools showing a shift toward a more microbial/algal and less plant/soil-derived character as human disturbance increased. The comparison of DOM composition between surface and groundwaters demonstrated that this pattern can be attributed in part to the transformation of terrestrial sources by agricultural practices that promote the decomposition of soil organic matter in agricultural lands and subsequent microbial inputs in terrestrial sources. In parallel, human land had contrasting effects on the autochthonous production of DOM and POM. While the in-stream generation of fresh DOM through biological activity was promoted in urban areas, summer autochthonous POM production was not influenced by land use. Finally, soil erosion by agricultural management practices favored the transfer of terrestrial organic matter via the particulate phase. Stable isotope data suggest that the hydrological transfer of terrestrial DOM and POM in humanimpacted catchment are not subject to the same controls, and that physical exchange between these two pools of organic matter is limited.

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Section: Introductionmentioning

confidence: 88%

Effects of human land use on the terrestrial and aquatic sources of fluvial organic matter in a temperate river basin (The Meuse River, Belgium)

et al. 2017

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“…The experiment conducted in the Jianou city of Fujian Province in China suggested that the concentrations of soil DOC and MBC in 0-10 cm declined respectively by 64.60% and 54.78% while woodland conversed into orchard land (Mao et al, 2008). Moreover, results reported by Delprat (1997) showed that there existed difference between the long-term and short-term effect of cultivation on the soil liable organic C, and during the first stage of three years, cultivation intensified mineralization of the initial organic matter, which led to an increase of 2-to 5-fold in the quantity of DOC, then DOC concentrations began to decrease with time of cultivation and tended to stable gradually. After nearly 30 years of cultivation, mean DOC concentrations were 4-to 6-fold less than those of the first stage.…”

Section: Grassland Cultivation and The Dynamics Of The Liable Organic Cmentioning

confidence: 97%

Effects of a conversion from grassland to cropland on the different soil organic carbon fractions in Inner Mongolia, China

Dong

Peng

et al. 2012

J. Geogr. Sci.

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Cultivation is one of the most important human activities affecting the grassland ecosystem besides grazing, but its impacts on soil total organic carbon (C), especially on the liable organic C fractions have not been fully understood yet. In this paper, the role of cropping in soil organic C pool of different fractions was investigated in a meadow steppe region in Inner Mongolia of China, and the relationships between different C fractions were also discussed. The results indicated that the concentrations of different C fractions at steppe and cultivated land all decreased progressively with soil depth. After the conversion from steppe to spring wheat field for 36 years, total organic carbon (TOC) concentration at the 0 to 100 cm soil depth has decreased by 12.3% to 28.2%, and TOC of the surface soil horizon, especially those of 0-30 cm decreased more significantly (p<0.01). The dissolved organic carbon (DOC) and microbial biomass carbon (MBC) at the depth of 0-40 cm were found to have decreased by 66.7% to 77.1% and 36.5% to 42.4%, respectively. In the S.baicalensis steppe, the ratios of soil DOC to TOC varied between 0.52% and 0.60%, and those in the spring wheat field were only in the range of 0.18%-0.20%. The microbial quotients (qMBs) in the spring wheat field, varying from 1.11% to 1.40%, were also lower than those in the S. baicalensis steppe, which were in the range of 1.50%-1.63%. The change of DOC was much more sensitive to cultivation disturbance. Soil TOC, DOC, and MBC were significantly positive correlated with each other in the S. baicalensis steppe, but in the spring wheat field, the correlativity between DOC and TOC and that between DOC and MBC did not reach the significance level of 0.05.

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“…In general, WSOC concentrations varied in different land uses, such as the forest soils, grassland soils, arable soils and so on, mostly due to different vegetation types (Delprat et al, 1997;Haynes, 2000). Besides, we also had learned that fertilization could affect the content of WSOC greatly (Zsolnay and Görlitz, 1994;Jensen et al, 1997;MartinOlmedo and Rees, 1999).…”

Section: Soil Water Soluble Organic Carbonmentioning

confidence: 99%

Soil Glycosidase Activities and Water Soluble Organic Carbon Under Different Land Use Types

Chen

et al. 2010

R.C. Suelo Nutr. Veg.

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The purpose of this study was to measure the effects of different land uses on soil glycosidase activities (α-and β-glucosidase, α-and β-galactosidase), water soluble organic carbon (WSOC) and their relationships. Glycosidase activities showed significant differences under different land use types, the highest one was woodland. β-glucosidase had the highest activity among the four glycosidases. The activities of these glycosidases decreased with increasing soil depth, being all significantly affected by change of soil depth. Except grassland, the four glycosidase activities intercorrelated each other. Woodland had the highest content of WSOC in the soil depth of 0-20 cm and at increasing soil depth, WSOC content decreased sharply under woodland and grassland. Glycosidase activities had positive and significant relationships with WSOC. Glycosidase activities and WSOC all had significant correlations with soil total organic carbon (TOC) and pH, which were sensitive to different land use types. We found that glycosidase activity indirectly impacts on nutrient recycling and energy flow in soil under different land use types.

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Characterization of dissolved organic carbon in cleared forest soils converted to maize cultivation

Cited by 51 publications

References 19 publications

Effects of human land use on the terrestrial and aquatic sources of fluvial organic matter in a temperate river basin (The Meuse River, Belgium)

Effects of human land use on the terrestrial and aquatic sources of fluvial organic matter in a temperate river basin (The Meuse River, Belgium)

Effects of a conversion from grassland to cropland on the different soil organic carbon fractions in Inner Mongolia, China

Soil Glycosidase Activities and Water Soluble Organic Carbon Under Different Land Use Types

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