Priming effect of small glucose additions to 14C-labelled soil

Dalenberg, J.W.; Jager, G.

doi:10.1016/0038-0717(81)90024-9

Cited by 73 publications

(30 citation statements)

References 7 publications

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“…This supports the hypotheses stated in past studies that enhanced mineralization of soil C pools in the presence of rhizodeposition is due not to enhanced breakdown of litter or complex SOM, but rather to the mineralization of microbial endocellular reserves (De Nobili et al 2001), the turnover of microbial biomass (Dalenberg and Jager 1981;Dalenberg and Jager 1989;Wu et al 1993), and greater microbial demand for N and other elements that are required to balance the elevated C availability from rhizodeposition (Kuzyakov 2002). Thus, rhizosphere microorganisms are able to respond positively to the presence of rhizodeposited C (Cheng et al 1996), but this response requires them to allocate resources toward peptide degradation in order to enhance N availability.…”

Section: Discussionsupporting

confidence: 87%

The effects of tree rhizodeposition on soil exoenzyme activity, dissolved organic carbon, and nutrient availability in a subalpine forest ecosystem

et al. 2007

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Previous studies have found that root carbon inputs to the soil can stimulate the mineralization of existing soil carbon (C) pools. It is still uncertain, however, whether this "primed" C is derived from elevated rates of soil organic matter (SOM) decomposition, greater C release from microbial pools, or both. The goal of this research was to determine how the activities of the microbial exoenzymes that control SOM decomposition are affected by root C inputs. This was done by manipulating rhizodeposition with tree girdling in a coniferous subalpine forest in the Rocky Mountains of Colorado, USA, and following changes in the activities of nine exoenzymes involved in decomposition, as well as soil dissolved organic C, dissolved organic and inorganic nitrogen (N), and microbial biomass C and N. We found that rhizodeposition is high in the spring, when the soils are still snow-covered, and that there are large ephemeral populations of microorganisms dependent upon this C. Microbial N acquisition from peptide degradation increased with increases in microbial biomass when rhizodeposition was highest. However, our data indicate that the breakdown of cellulose, lignin, chitin, and organic phosphorus are not affected by springtime increases in soil microbial biomass associated with increases in rhizodeposition. We conclude that the priming of soil C mineralization by rhizodeposition is due to growth of the microbial biomass and an increase in the breakdown of N-rich proteins, but not due to increases in the degradation of plant litter constituents such as cellulose and lignin.

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Section: Discussionsupporting

confidence: 87%

The effects of tree rhizodeposition on soil exoenzyme activity, dissolved organic carbon, and nutrient availability in a subalpine forest ecosystem

et al. 2007

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“…This suggests that added dead above-ground leaf litter is primarily decomposed by soil microorganisms, and that this additional energy source enables them to more effectively decompose existing soil organic matter. This effect is well known as priming (Dalenberg and Jager 1981;Jenkinson et al 1985;Kuzyakov et al 2000;Fontaine et al 2011). This vital effect on soil carbon storage is further supported from studies investigating the positive effect of biodiversity on carbon storage.…”

Section: Role Of Plantsmentioning

confidence: 96%

Soil organic matter dynamics: a biological perspective derived from the use of compound‐specific isotopes studies

Gleixner

2013

Ecological Research

207

147

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“…Studies on C turnover have led some authors to believe that the priming effect essentially involves additional decomposition of organic C upon addition of easily decomposed organic substances to soil. However, the difficulty of monitoring this effect, even with C and N isotopes (Dalemberg and Jager, 1989;Kuderayoz et al, 1987), has led to its redefinition as an apparent priming effect (Haynes, 1986).…”

Section: Introductionmentioning

confidence: 99%

Cover crops and organic amendments to prevent nitrate contamination under a wet climate

Vidal

López

2005

Agron. Sustain. Dev.

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HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. Abstract -The efficiency of a rye cover crop as a preventive measure for nitrate contamination in water resources was assessed in field tests. The study region (Galicia, NW Spain), which is severely affected by this environmental impact, has an annual average precipitation markedly exceeding the evapotranspiration level. Two additional corrective measures (viz. buried wheat and lupin green manure) were also studied in parallel. A randomized complete block experimental model spanning a period of three years was used to systematically determine the organic matter, total N, NO 3 --N and NH 4 + -N contents, and the C/N ratio, in the 0-20 and 20-40 cm soil layers. Based on the significance of the different effects examined in the variance explanation model (viz. the repeated measurements general linear model) as evaluated using multivariate comparisons, the rye treatment proved more efficient than the other two corrective practices at controlling NO 3 -leaching from soil. By contrast, the application of the two plant residues to the soil exposed a priming effect induced by the simultaneous incorporation of mineral N. The suppression of the individual effects of some variability sources revealed a clear fertilizing effect in the green manure and net immobilization resulting from the incorporation of straw into the soil.contamination / nitrate / cover crops / green manure / straw / rye / lupin

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Priming effect of small glucose additions to 14C-labelled soil

Cited by 73 publications

References 7 publications

The effects of tree rhizodeposition on soil exoenzyme activity, dissolved organic carbon, and nutrient availability in a subalpine forest ecosystem

The effects of tree rhizodeposition on soil exoenzyme activity, dissolved organic carbon, and nutrient availability in a subalpine forest ecosystem

Soil organic matter dynamics: a biological perspective derived from the use of compound‐specific isotopes studies

Cover crops and organic amendments to prevent nitrate contamination under a wet climate

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