Spatial and seasonal variation of gross nitrogen transformations and microbial biomass in a Northeastern US grassland

Corre, Marife D.; Schnabel, R. R.; Stout, W. L.

doi:10.1016/s0038-0717(01)00198-5

Cited by 153 publications

(88 citation statements)

References 35 publications

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“…A low availability of nitrate could explain the lower proportions of nitrate-dissimilating strains in root-associated fractions, where N depletion is increased by plant uptakes. Corre and co-workers [13] suggested a high competition for available N between microorganisms and plant. Moreover, Nijburg and co-workers [37,38] noticed that addition of nitrate in the rhizosphere of G. maxima resulted in an increased number of NR strains.…”

Section: Resultsmentioning

confidence: 99%

Frequency and Diversity of Nitrate Reductase Genes among Nitrate-Dissimilating Pseudomonas in the Rhizosphere of Perennial Grasses Grown in Field Conditions

et al. 2005

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A total of 1246 Pseudomonas strains were isolated from the rhizosphere of two perennial grasses (Lolium perenne and Molinia coerulea) with different nitrogen requirements. The plants were grown in their native soil under ambient and elevated atmospheric CO 2 content (pCO 2 ) at the Swiss FACE (Free Air CO 2 Enrichment) facility. Root-, rhizosphere-, and non-rhizospheric soil-associated strains were characterized in terms of their ability to reduce nitrate during an in vitro assay and with respect to the genes encoding the membrane-bound (named NAR) and periplasmic (NAP) nitrate reductases so far described in the genus Pseudomonas. The diversity of corresponding genes was assessed by PCR-RFLP on narG and napA genes, which encode the catalytic subunit of nitrate reductases. The frequency of nitrate-dissimilating strains decreased with root proximity for both plants and was enhanced under elevated pCO 2 in the rhizosphere of L. perenne. NAR (54% of strains) as well as NAP (49%) forms were present in nitrate-reducing strains, 15.5% of the 439 strains tested harbouring both genes. The relative proportions of narG and napA detected in Pseudomonas strains were different according to root proximity and for both pCO 2 treatments: the NAR form was more abundant close to the root surface and for plants grown under elevated pCO 2 . Putative denitrifiers harbored mainly the membrane-bound (NAR) form of nitrate reductase. Finally, both narG and napA sequences displayed a high level of diversity. Anyway, this diversity was correlated neither with the root proximity nor with the pCO 2 treatment.

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Section: Resultsmentioning

confidence: 99%

Frequency and Diversity of Nitrate Reductase Genes among Nitrate-Dissimilating Pseudomonas in the Rhizosphere of Perennial Grasses Grown in Field Conditions

et al. 2005

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“…The importance of nitrification has been demonstrated in other grassland ecosystems (Schimel et al, 1989;Davidson et al, 1990;Corre et al, 2002), but could have been overlooked in these forest and grassland soils, due to low extractable NO 3 À concentrations (Fig. 1c) and net nitrification rates (McKinley and Blair, 2008).…”

Section: µG Nhmentioning

confidence: 92%

“…Nitrification in grasslands is also important, but may be masked because of the strong potential to immobilize NO 3 À similar to some coniferous forests (Schimel et al, 1989;Davidson et al, 1990;Corre et al, 2002). The objectives of this study were to assess changes in potential internal cycling of N and soil N availability following J. virginiana forest encroachment into grassland.…”

Section: Introductionmentioning

confidence: 99%

Conversion of grassland to coniferous woodland has limited effects on soil nitrogen cycle processes

McKinley

Rice

Blair

2008

Soil Biology and Biochemistry

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“…In this study, the mean soil carbon flux was higher in grassland than that in forest. Corre et al (2002) found that poorly drained soils on the lower slopes generally have higher microbial respiration compared to well-drained soil on the upper slopes. A significant difference in soil respiration between different slope positions has previously been also reported in the Loess Plateau (Li Rong et al, 2008).…”

Section: Soil Co 2 Emissions and Impact Factorsmentioning

confidence: 95%

Soil carbon stock and flux in plantation forest and grassland ecosystems in Loess Plateau, China

Li²,

Fu³

et al. 2014

Chin. Geogr. Sci.

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Abstract:Carbon sequestration occurs when cultivated soils are re-vegetated. In the hilly area of the Loess Plateau, China, black locust (Robinia pseudoacacia) plantation forest and grassland were the two main vegetation types used to mitigate soil and water loss after cultivation abandonment. The purpose of this study was to compare the soil carbon stock and flux of these two types of vegetation which restored for 25 years. The experiment was conducted in Yangjuangou catchment in Yan′an City, Shaanxi Province, China. Two adjacent slopes were chosen for this study. Six sample sites were spaced every 35-45 m from summit to toe slope along the hill slope, and each sample site contained three sampling plots. Soil organic carbon and related physicochemical properties in the surface soil layer (0-10 cm and 10-20 cm) were measured based on soil sampling and laboratory analysis, and the soil carbon dioxide (CO 2 ) emissions and environmental factors were measured in the same sample sites simultaneously. Results indicated that in general, a higher soil carbon stock was found in the black locust plantation forest than that in grassland throughout the hill slope. Meanwhile, significant differences in the soil carbon stock were observed between these two vegetation types in the upper slope at soil depth 0-10 cm and lower slope at soil depth 10-20 cm. The average daily values of the soil CO 2 emissions were 1.27 mol/(m 2 ·s) and 1.39 mol/(m 2 ·s) for forest and grassland, respectively. The soil carbon flux in forest covered areas was higher in spring and less variation was detected between different seasons, while the highest carbon flux was found in grassland in summer, which was about three times higher than that in autumn and spring. From the carbon sequestration point of view, black locust plantation forest on hill slopes might be better than grassland because of a higher soil carbon stock and lower carbon flux.

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Spatial and seasonal variation of gross nitrogen transformations and microbial biomass in a Northeastern US grassland

Cited by 153 publications

References 35 publications

Frequency and Diversity of Nitrate Reductase Genes among Nitrate-Dissimilating Pseudomonas in the Rhizosphere of Perennial Grasses Grown in Field Conditions

Frequency and Diversity of Nitrate Reductase Genes among Nitrate-Dissimilating Pseudomonas in the Rhizosphere of Perennial Grasses Grown in Field Conditions

Conversion of grassland to coniferous woodland has limited effects on soil nitrogen cycle processes

Soil carbon stock and flux in plantation forest and grassland ecosystems in Loess Plateau, China

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